Tue Sept 15. Dynamics - Newton s Laws of Motion. Forces: Identifying Forces Free-body diagram Affect on Motion

Size: px
Start display at page:

Download "Tue Sept 15. Dynamics - Newton s Laws of Motion. Forces: Identifying Forces Free-body diagram Affect on Motion"

Transcription

1 Tue Sept 15 Assignment 4 Friday Pre-class Thursday Lab - Print, do pre-lab Closed toed shoes Exam Monday Oct 5 7:15-9:15 PM me if class conflict or extended time Dynamics - Newton s Laws of Motion Forces: Identifying Forces Free-body diagram Affect on Motion Free-body diagram Draw object Draw and label an arrow for each force acting on that object Draw arrows from point at center of object

2 A net force of 250 N is exerted to the right on a large box of mass 50 kg. What is the acceleration of the box? (1) 0.2 m/s 2 to the right (2) 0.2 m/s 2 to the left (3) 1.25 m/s 2 to the right (4) 1.25 m/s 2 to the left (5) 5.0 m/s 2 to the right (6) 5.0 m/s 2 to the left (7) 12.5 m/s 2 to the right (8) 12.5 m/s 2 to the left Acceleration same direction as the force.

3 Forces! Sect 4.1 What is a force? Identifying forces. What is the connection between force and motion? How are forces related when two objects interact? Application different forces: contact, non-contact forces different situations F TABLE-ON-BLOCK Free-body Diagram Draw object Draw and label an arrow for each force acting on that object Typically draw arrows from point at center of object F FRICTION F GRAVITY F ROPE

4 Measuring Forces! Sect 4.1 Spring Scale Greater the force, the greater the stretch (Δx) (a) This spring has a length x when undistorted. (b)when stretched a distance Δx, the spring exerts a restoring force, Frestore. (c) A spring scale is one device that uses a spring to measure force. The force Frestore is exerted on whatever is attached to the hook. Here Frestore has a magnitude of 6 units in the force standard being employed.

5 The Magnet and the Paper Clip Identifying forces In your notes write the forces acting on the paper clip for each of these situations: (A) While it is on the ground. (B) While I'm in the process of throwing it. (C) While it is in the air. (D) While is it stuck to the magnet. Identifying Forces Any non-contact (action at a distance) forces? What's touching the object?

6 Newton's First Law of Motion! Sect 4.2 A body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force NET External Force sum of all the forces acting on an object Example: Puck on ice F FRICTION-FROM-ICE F ICE-PUSHING-UP F GRAVITY vertical net external force = 0

7 External vs. Internal Forces If System is boy and wagon Force of ground on wagon and boy is an external force Force of boy on wagon and wagon on boy are internal forces Net Add them all up! Sect 4.2

8 A book is lying at rest on a table. The book will remain at rest because: 1. there is a net force but the book has too much inertia 2. there are no forces acting on it at all 3. it does move, but too slowly to be seen 4. there is no net force on the book 5. there is a new force, but the book is too heavy to move There are forces acting on the book, but the only forces acting on it are in the vertical direction. Gravity acts downward, but the table exerts an upward force that is equally strong, so the two forces cancel, leaving no net force.

9 A hockey puck slides on ice at a constant velocity. What is the net force acting on the puck? 1. more than its weight 2. equal to its weight 3. less than its weight but more than zero 4. depends on the speed of the puck 5. zero The puck is moving at a constant velocity, and therefore it is not accelerating. Thus, there must be no net force acting on the puck.

10 You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why? 1. a net force acted on it 2. no net force acted on it 3. it remained at rest 4. it did not move, but only seemed to 5. gravity briefly stopped acting on it The book was initially moving forward (since it was on a moving bus). When the bus stopped, the book continued moving forward, which was its initial state of motion, and therefore it slid forward off the seat.

11 Newton's Second Law of Motion! Sect 4.3 When a net external force acts on an object of mass m, the acceleration a that results is directly proportional to the net force and has a magnitude that is inversely proportional to the mass. The direction of the acceleration is the same as the direction of the net force. Mass measure of inertia (kg) Definition/Notation Break into components

12 You and a friend are sliding a large 100 kg box across the floor. Your friend pulls to the right with a force of 250 N. You push to the right with a force of 300 N. The frictional force of the floor opposes the motion with a force of 500 N. What is the acceleration of the box? (Draw a FBD) (1) 0.5 m/s 2 to the left (2) 0.5 m/s 2 to the right (3) 1.0 m/s 2 to the left (4) 1.0 m/s 2 to the right (5) 2.0 m/s 2 to the left (6) 2.0 m/s 2 to the right (7) 5.5 m/s 2 to the left (8) 5.5 m/s 2 to the right (9) 10.5 m/s 2 to the left (0) 10.5 m/s 2 to the right Friction Friend You All in 1-dimension, so just add components assume +x to right +250 N N 500 N = (100 kg) a 50 N = 100 kg a

13 You and a friend are sliding a large 100 kg box across the floor. Your friend pulls to the right with a force of 250 N. The frictional force of the floor opposes the motion with a force of 500 N. The box has an acceleration of 1.0 m/s 2 to the right. What is the force that you exert on the box? (1) 100N to the left (2) 100N to the right (3) 300N to the left (4) 300N to the right (5) 350N to the left (6) 350N to the right (7) 450N to the left (8) 450N to the right We know result of net force, so we know net force All in 1-dimension, so just add components - assume +x to right Friction Friend You F N 500 N = (100 kg) 1.0 m/s 2 F = 100 N 250 N N

14 You exert a constant force of 200 N to the right on a box of mass 100 kg. Friction is negligible. If the box starts at rest, what is the velocity after 3.0 s? (1) 1 m/s to the left (2) 1 m/s to the right (3) 2 m/s to the left (4) 2 m/s to the right 200 N (5) 3 m/s to the left (6) 3 m/s to the right (7) 6 m/s to the left (8) 6 m/s to the right Find the acceleration, then find the final velocity. Assume +x to the right F = ma 200N = 100kg * a a = 2 m/s 2 v = v 0 + at v = 0 + (2 m/s 2 )(3 s) v = 6 m/s

15 Linking Dynamics and Kinematics Force, Mass accel accel position,velocity accel, time A 550 kg car increases its speed from 20 m/s to 40 m/s over a flat stretch of road 400 m long. What is the average NET horizontal force on the car? Want NET force Find acceleration from kinematic variables Given acceleration, find net force a = 1.5 m/s 2 (v 2 = v *a*x) F NET = m*a = 825 N If drag forces on car are 340 N, what is the magnitude of the force propelling the car forward? F PROPEL = 1165 N F NET = 825 N = F PROPEL - F DRAG = F PROPEL N

16 System Example: A physics professor pushes a cart of demonstration equipment to a lecture hall.! Sect 4.3

17 Two cars are pushed apart by a spring. The blue car is roughly double the mass of the red car. The magnitude of the force that the blue car exerts on the red car is the magnitude of the force that the red car exerts on the blue car. 1. greater than 2. equal to 3. less than

18 Newton s Third Law of Motion! Sect 4.4 Whenever one body exerts a force on a second body, the second body exerts an oppositely directed force of equal magnitude on the first body. Action/Reaction Pairs The two forces act on DIFFERENT OBJECTS. You will never find both the action and reaction force on the same FBD! Walking Exert force on ground, ground exerts force back Car wheels push back on ground, ground pushes forward on wheels

19 Fundamental Forces! Sect 4.8 Electromagnetic Force Weak Nuclear Force Strong Nuclear Force Gravitational Force Contact forces basically electromagnetic Only 'action-at-a-distance' force for a while is Gravitation

20 Weight and Gravitational Force! Sect 4.3 Acts between objects that have mass Always attractive along line between objects At surface of Earth, object in freefall accelerates 9.8 m/s 2 So at surface of earth, Weight = F GRAVITY = mg Always acts down. Use g = 9.8m/s 2 then put sign on force (depending on coordinate system). On the Earth s surface, a 1.0-kg mass object would have a weight of 9.8 N

21 Small Variations in "g" Measured by GRACE satellite Gravity Recovery and Climate Experiment Red g bigger Blue g smaller Can 'see' features as small as 200 km 1 milligal = m/s 2

22 Consider standing first at sea level then at the top of Mt. Rainier in the State of Washington. 1. Your mass is greater at sea level 2. Your mass is greater at the top of Mt. Rainier 3. Your mass is the same in both places Mass is independent of weight.

23 A ball of mass 2.0 kg is hanging from a string. The ball is accelerating upward at 1 m/s 2. What is the force that the string is exerting on the ball? (1) 0 N (2) 4.0 N (3) 14.6 N (4) 17.6 N (5) 19.6 N (6) 21.6 N (7) 26.6 N (8) 30.0 N +y ΣF Y = ma y F STRING F STRING - F G = ma y F STRING - mg = 2kg(1m/s 2 ) F G F STRING 2kg(9.8 m/s 2 ) = 2N F STRING = 21.6N Force of string must support weight AND cause upward acceleration

24 A ball of mass 2.0kg is hanging from a string. The ball is traveling upward but slowing down. How does the force from the string (the tension) compare to the weight of the ball? (1) Tension is greater than weight (2) Tension is equal to weight (3) Tension is less than weight ΣF Y = ma y +y F STRING F STRING - F G = ma y F G v a F STRING = mg + ma y But, a is negative F STRING < mg Since force of string less than weight, net force is down. Object is slowing down.

25 A book weighs 10 N. You push straight down on the top of the book with a force of 75 N. What is the force with which the floor pushes up on the book? (1) 10 N (2) 75 N (3) 100 N (4) 65 N (5) 85 N F FLOOR F G F YOU ΣF Y = ma y F FLOOR 10 N 75 N = 0 F FLOOR = 10N + 75N What if a Y wasn't zero? Just plug in value.

Exam 1 is Two Weeks away.here are some tips:

Exam 1 is Two Weeks away.here are some tips: Assignment 4 due Friday like almost every Friday Pre-class due 15min before class like every class Help Room: Here, 6-9pm Wed/Thurs SI: Morton 326, M&W 7:15-8:45pm Office Hours: 204 EAL, 10-11am Wed or

More information

Chapter 4 Force and Motion

Chapter 4 Force and Motion Chapter 4 Force and Motion Units of Chapter 4 The Concepts of Force and Net Force Inertia and Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion More on Newton s Laws:

More information

Thursday February 8. Write these equations in your notes if they re not already there. You will want them for Exam 1 & the Final.

Thursday February 8. Write these equations in your notes if they re not already there. You will want them for Exam 1 & the Final. Assignment 4 due Friday like almost every Friday Pre-class due 15min before class like every class Help Room: Here, 6-9pm Wed/Thurs SI: Morton 222, M&W 7:15-8:45pm Office Hours: 204 EAL, 10-11am Wed or

More information

Chapter 5 Newton s Laws of Motion. Copyright 2010 Pearson Education, Inc.

Chapter 5 Newton s Laws of Motion. Copyright 2010 Pearson Education, Inc. Chapter 5 Newton s Laws of Motion Copyright 2010 Pearson Education, Inc. Force and Mass Copyright 2010 Pearson Education, Inc. Units of Chapter 5 Newton s First Law of Motion Newton s Second Law of Motion

More information

CHAPTER 4 TEST REVIEW -- Answer Key

CHAPTER 4 TEST REVIEW -- Answer Key AP PHYSICS Name: Period: Date: DEVIL PHYSICS BADDEST CLASS ON CAMPUS 50 Multiple Choice 45 Single Response 5 Multi-Response Free Response 3 Short Free Response 2 Long Free Response AP EXAM CHAPTER TEST

More information

Four naturally occuring forces

Four naturally occuring forces Forces System vs Environment: system the object the force is applied to environment the world around the object that exerts the force Type Forces: Contact is applied by touching Long range exerted without

More information

Chapter 3: Newton s Laws of Motion

Chapter 3: Newton s Laws of Motion Chapter 3: Newton s Laws of Motion Mini Investigation: Predicting Forces, page 113 Answers may vary. Sample answers: A. I predicted the reading in question 3 would be the sum of the readings from questions

More information

Dynamics; Newton s Laws of Motion

Dynamics; Newton s Laws of Motion Dynamics; Newton s Laws of Motion Force A force is any kind of push or pull on an object. An object at rest needs a force to get it moving; a moving object needs a force to change its velocity. The magnitude

More information

Chapter Four Holt Physics. Forces and the Laws of Motion

Chapter Four Holt Physics. Forces and the Laws of Motion Chapter Four Holt Physics Forces and the Laws of Motion Physics Force and the study of dynamics 1.Forces - a. Force - a push or a pull. It can change the motion of an object; start or stop movement; and,

More information

Chapter 4 Newton s Laws

Chapter 4 Newton s Laws Chapter 4 Newton s Laws Isaac Newton 1642-1727 Some inventions and discoveries: 3 laws of motion Universal law of gravity Calculus Ideas on: Sound Light Thermodynamics Reflecting telescope In this chapter,

More information

Lecture 6. Newton s laws of motion. Important note: First Exam is on Tuesday, Feb. 6, 8:15-9:45 pm

Lecture 6. Newton s laws of motion. Important note: First Exam is on Tuesday, Feb. 6, 8:15-9:45 pm Lecture 6 Newton s laws of motion Important note: First Exam is on Tuesday, Feb. 6, 8:15-9:45 pm Today s Topics: Newton s Laws of Motion Newton s 1 st Law (Inertial reference frames) Vector nature of forces

More information

ConcepTest PowerPoints

ConcepTest PowerPoints ConcepTest PowerPoints Chapter 4 Physics: Principles with Applications, 6 th edition Giancoli 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for

More information

Dynamics: Forces and Newton s Laws of Motion

Dynamics: Forces and Newton s Laws of Motion Lecture 7 Chapter 5 Physics I Dynamics: Forces and Newton s Laws of Motion Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsi Today we are going to discuss: Chapter 5: Force, Mass:

More information

Dynamics: Forces and Newton s Laws of Motion

Dynamics: Forces and Newton s Laws of Motion Lecture 7 Chapter 5 Dynamics: Forces and Newton s Laws of Motion Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsi Today we are going to discuss: Chapter 5: Force, Mass: Section 5.1

More information

Lecture PowerPoints. Chapter 4 Physics: for Scientists & Engineers, with Modern Physics, 4th edition Giancoli

Lecture PowerPoints. Chapter 4 Physics: for Scientists & Engineers, with Modern Physics, 4th edition Giancoli Lecture PowerPoints Chapter 4 Physics: for Scientists & Engineers, with Modern Physics, 4th edition Giancoli 2009 Pearson Education, Inc. This work is protected by United States copyright laws and is provided

More information

General Physics I Spring Forces and Newton s Laws of Motion

General Physics I Spring Forces and Newton s Laws of Motion General Physics I Spring 2011 Forces and Newton s Laws of Motion 1 Forces and Interactions The central concept in understanding why things move is force. If a tractor pushes or pulls a trailer, the tractor

More information

Newton s Laws of Motion. Chapter 4

Newton s Laws of Motion. Chapter 4 Newton s Laws of Motion Chapter 4 Newton s First Law of Motion Force A force is a push or pull. An object at rest needs a force to get it moving; a moving object needs a force to change its velocity. Force

More information

Physics B Newton s Laws AP Review Packet

Physics B Newton s Laws AP Review Packet Force A force is a push or pull on an object. Forces cause an object to accelerate To speed up To slow down To change direction Unit: Newton (SI system) Newton s First Law The Law of Inertia. A body in

More information

Part I: Mechanics. Chapter 2 Inertia & Newton s First Law of Motion. Aristotle & Galileo. Lecture 2

Part I: Mechanics. Chapter 2 Inertia & Newton s First Law of Motion. Aristotle & Galileo. Lecture 2 Lecture 2 Part I: Mechanics Chapter 2 Inertia & Newton s First Law of Motion Some material courtesy Prof. A. Garcia, SJSU Aristotle & Galileo Aristotle was great philosopher but not such a good scientist.

More information

Chapter 5 Force and Motion

Chapter 5 Force and Motion Chapter 5 Force and Motion Chapter Goal: To establish a connection between force and motion. Slide 5-2 Chapter 5 Preview Slide 5-3 Chapter 5 Preview Slide 5-4 Chapter 5 Preview Slide 5-5 Chapter 5 Preview

More information

Force 10/01/2010. (Weight) MIDTERM on 10/06/10 7:15 to 9:15 pm Bentley 236. (Tension)

Force 10/01/2010. (Weight) MIDTERM on 10/06/10 7:15 to 9:15 pm Bentley 236. (Tension) Force 10/01/2010 = = Friction Force (Weight) (Tension), coefficient of static and kinetic friction MIDTERM on 10/06/10 7:15 to 9:15 pm Bentley 236 2008 midterm posted for practice. Help sessions Mo, Tu

More information

Chapter 5 Lecture. Pearson Physics. Newton's Laws of Motion. Prepared by Chris Chiaverina Pearson Education, Inc.

Chapter 5 Lecture. Pearson Physics. Newton's Laws of Motion. Prepared by Chris Chiaverina Pearson Education, Inc. Chapter 5 Lecture Pearson Physics Newton's Laws of Motion Prepared by Chris Chiaverina Chapter Contents Newton's Laws of Motion Applying Newton's Laws Friction Newton's Laws of Motion Two of the most important

More information

The Concept of Force Newton s First Law and Inertial Frames Mass Newton s Second Law The Gravitational Force and Weight Newton s Third Law Analysis

The Concept of Force Newton s First Law and Inertial Frames Mass Newton s Second Law The Gravitational Force and Weight Newton s Third Law Analysis The Laws of Motion The Concept of Force Newton s First Law and Inertial Frames Mass Newton s Second Law The Gravitational Force and Weight Newton s Third Law Analysis Models using Newton s Second Law Forces

More information

PHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc.

PHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc. PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 5 Lecture RANDALL D. KNIGHT Chapter 5 Force and Motion IN THIS CHAPTER, you will learn about the connection between force and motion.

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. FLEX Physical Science AP Physics C Newton's Laws --- Conceptual Questions MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) You swing a bat and hit

More information

Topic: Force PHYSICS 231

Topic: Force PHYSICS 231 Topic: Force PHYSICS 231 Current Assignments Homework Set 2 due this Thursday, Jan 27, 11 pm Reading for next week: Chapters 10.1-6,10.10,8.3 2/1/11 Physics 231 Spring 2011 2 Key Concepts: Force Free body

More information

AP Physics 1 - Test 05 - Force and Motion

AP Physics 1 - Test 05 - Force and Motion P Physics 1 - Test 05 - Force and Motion Score: 1. brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it? Putting a second brick on top

More information

Section /07/2013. PHY131H1F University of Toronto Class 9 Preclass Video by Jason Harlow. Based on Knight 3 rd edition Ch. 5, pgs.

Section /07/2013. PHY131H1F University of Toronto Class 9 Preclass Video by Jason Harlow. Based on Knight 3 rd edition Ch. 5, pgs. PHY131H1F University of Toronto Class 9 Preclass Video by Jason Harlow Based on Knight 3 rd edition Ch. 5, pgs. 116-133 Section 5.1 A force is a push or a pull What is a force? What is a force? A force

More information

Engage I 1. What do you think about this design? If the car were to suddenly stop, what would happen to the child? Why?

Engage I 1. What do you think about this design? If the car were to suddenly stop, what would happen to the child? Why? AP Physics 1 Lesson 4.a Nature of Forces Outcomes Define force. State and explain Newton s first Law of Motion. Describe inertia and describe its relationship to mass. Draw free-body diagrams to represent

More information

Concept of Force and Newton s Laws of Motion

Concept of Force and Newton s Laws of Motion Concept of Force and Newton s Laws of Motion 8.01 W02D2 Chapter 7 Newton s Laws of Motion, Sections 7.1-7.4 Chapter 8 Applications of Newton s Second Law, Sections 8.1-8.4.1 Announcements W02D3 Reading

More information

PHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc.

PHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc. PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 5 Lecture RANDALL D. KNIGHT Chapter 5 Force and Motion IN THIS CHAPTER, you will learn about the connection between force and motion.

More information

Phys101 Lecture 5 Dynamics: Newton s Laws of Motion

Phys101 Lecture 5 Dynamics: Newton s Laws of Motion Phys101 Lecture 5 Dynamics: Newton s Laws of Motion Key points: Newton s second law is a vector equation Action and reaction are acting on different objects Free-Body Diagrams Ref: 4-1,2,3,4,5,6,7. Page

More information

POGIL: Newton s First Law of Motion and Statics. Part 1: Net Force Model: Read the following carefully and study the diagrams that follow.

POGIL: Newton s First Law of Motion and Statics. Part 1: Net Force Model: Read the following carefully and study the diagrams that follow. POGIL: Newton s First Law of Motion and Statics Name Purpose: To become familiar with the forces acting on an object at rest Part 1: Net Force Model: Read the following carefully and study the diagrams

More information

Newton s First Law and IRFs

Newton s First Law and IRFs Goals: Physics 207, Lecture 6, Sept. 22 Recognize different types of forces and know how they act on an object in a particle representation Identify forces and draw a Free Body Diagram Solve 1D and 2D

More information

A N D. c h a p t e r 1 2 M O T I O N F O R C E S

A N D. c h a p t e r 1 2 M O T I O N F O R C E S F O R C E S A N D c h a p t e r 1 2 M O T I O N What is a FORCE? A FORCE is a push or pull that acts on an object. A force can cause a resting object to move OR Accelerate a moving object by: changing

More information

Dynamics Multiple Choice Homework

Dynamics Multiple Choice Homework Dynamics Multiple Choice Homework PSI Physics Name 1. In the absence of a net force, a moving object will A. slow down and eventually stop B. stop immediately C. turn right D. move with constant velocity

More information

Unit 2 Part 2: Forces Note 1: Newton`s Universal Law of Gravitation. Newton`s Law of Universal Gravitation states: Gravity. Where: G = M = r =

Unit 2 Part 2: Forces Note 1: Newton`s Universal Law of Gravitation. Newton`s Law of Universal Gravitation states: Gravity. Where: G = M = r = Unit 2 Part 2: Forces Note 1: Newton`s Universal Law of Gravitation Gravity Newton`s Law of Universal Gravitation states: Where: G = = M = m = r = Ex 1: What is the force of gravity exerted on a 70.0 kg

More information

Chapter 3, Problem 28. Agenda. Forces. Contact and Field Forces. Fundamental Forces. External and Internal Forces 2/6/14

Chapter 3, Problem 28. Agenda. Forces. Contact and Field Forces. Fundamental Forces. External and Internal Forces 2/6/14 Agenda Today: Homework Quiz, Chapter 4 (Newton s Laws) Thursday: Applying Newton s Laws Start reading Chapter 5 Chapter 3, Problem 28 A ball with a horizontal speed of 1.25 m/s rolls off a bench 1.00 m

More information

Newton s 3 Laws of Motion

Newton s 3 Laws of Motion Newton s 3 Laws of Motion 1. If F = 0 No change in motion 2. = ma Change in motion Fnet 3. F = F 1 on 2 2 on 1 Newton s First Law (Law of Inertia) An object will remain at rest or in a constant state of

More information

3/10/2019. What Is a Force? What Is a Force? Tactics: Drawing Force Vectors

3/10/2019. What Is a Force? What Is a Force? Tactics: Drawing Force Vectors What Is a Force? A force acts on an object. A force requires an agent, something that acts on the object. If you throw a ball, your hand is the agent or cause of the force exerted on the ball. A force

More information

Physics General Physics. Lecture 3 Newtonian Mechanics. Fall 2016 Semester. Prof. Matthew Jones

Physics General Physics. Lecture 3 Newtonian Mechanics. Fall 2016 Semester. Prof. Matthew Jones Physics 22000 General Physics Lecture 3 Newtonian Mechanics Fall 2016 Semester Prof. Matthew Jones 1 Review of Lectures 1 and 2 In the previous lectures we learned how to describe some special types of

More information

Chapter 4. Dynamics: Newton s Laws of Motion. That is, describing why objects move

Chapter 4. Dynamics: Newton s Laws of Motion. That is, describing why objects move Chapter 4 Dynamics: Newton s Laws of Motion That is, describing why objects move orces Newton s 1 st Law Newton s 2 nd Law Newton s 3 rd Law Examples of orces: Weight, Normal orce, Tension, riction ree-body

More information

Section /07/2013. PHY131H1F University of Toronto Class 12 Preclass Video by Jason Harlow. Based on Knight 3 rd edition Ch. 7, pgs.

Section /07/2013. PHY131H1F University of Toronto Class 12 Preclass Video by Jason Harlow. Based on Knight 3 rd edition Ch. 7, pgs. PHY131H1F University of Toronto Class 12 Preclass Video by Jason Harlow Section 7.1 Based on Knight 3 rd edition Ch. 7, pgs. 167-184 When a hammer hits a nail, it exerts a forward force on the nail At

More information

PHYSICS - CLUTCH CH 04: INTRO TO FORCES (DYNAMICS)

PHYSICS - CLUTCH CH 04: INTRO TO FORCES (DYNAMICS) !! www.clutchprep.com FORCE, APPLIED FORCE, TENSION A force is either a push or a pull. Unit = ( ) - We ll represent all forces as a We ll refer to generic forces as forces. - Usually on an object by a

More information

Chapter 7 Newton s Third Law

Chapter 7 Newton s Third Law Chapter 7 Newton s Third Law Chapter Goal: To use Newton s third law to understand interacting objects. Slide 7-2 Chapter 7 Preview Slide 7-3 Chapter 7 Preview Slide 7-4 Chapter 7 Preview Slide 7-6 Chapter

More information

Conceptual Physics Fundamentals. Chapter 3: EQUILIBRIUM AND LINEAR MOTION

Conceptual Physics Fundamentals. Chapter 3: EQUILIBRIUM AND LINEAR MOTION Conceptual Physics Fundamentals Chapter 3: EQUILIBRIUM AND LINEAR MOTION This lecture will help you understand: Aristotle on Motion Galileo s Concept of Inertia Mass A Measure of Inertia Net Force The

More information

Chapter: The Laws of Motion

Chapter: The Laws of Motion Table of Contents Chapter: The Laws of Motion Section 1: Newton s Second Law Section 2: Gravity Section 3: The Third Law of Motion 1 Newton s Second Law Force, Mass, and Acceleration Newton s first law

More information

What Is a Force? Slide Pearson Education, Inc.

What Is a Force? Slide Pearson Education, Inc. What Is a Force? A force acts on an object. A force requires an agent, something that acts on the object. If you throw a ball, your hand is the agent or cause of the force exerted on the ball. A force

More information

Newton s Laws.

Newton s Laws. Newton s Laws http://mathsforeurope.digibel.be/images Forces and Equilibrium If the net force on a body is zero, it is in equilibrium. dynamic equilibrium: moving relative to us static equilibrium: appears

More information

Written homework #5 due on Monday Online homework #5 due on Tuesday. Answer keys posted on course web site SPARK grades uploaded Average = 74.

Written homework #5 due on Monday Online homework #5 due on Tuesday. Answer keys posted on course web site SPARK grades uploaded Average = 74. Homework Written homework #5 due on Monday Online homework #5 due on Tuesday Exam 1 Answer keys posted on course web site SPARK grades uploaded Average = 74.3% 1 Chapter 4 Forces and Newton s Laws of Motion

More information

Circular Motion. A car is traveling around a curve at a steady 45 mph. Is the car accelerating? A. Yes B. No

Circular Motion. A car is traveling around a curve at a steady 45 mph. Is the car accelerating? A. Yes B. No Circular Motion A car is traveling around a curve at a steady 45 mph. Is the car accelerating? A. Yes B. No Circular Motion A car is traveling around a curve at a steady 45 mph. Which vector shows the

More information

Physics 221, January 24

Physics 221, January 24 Key Concepts: Newton s 1 st law Newton s 2 nd law Weight Newton s 3 rd law Physics 221, January 24 Please find a seat. Keep all walkways free for safety reasons and to comply with the fire code. Matter

More information

A force is could described by its magnitude and by the direction in which it acts.

A force is could described by its magnitude and by the direction in which it acts. 8.2.a Forces Students know a force has both direction and magnitude. P13 A force is could described by its magnitude and by the direction in which it acts. 1. Which of the following could describe the

More information

The Concept of Force. field forces d) The gravitational force of attraction between two objects. f) Force a bar magnet exerts on a piece of iron.

The Concept of Force. field forces d) The gravitational force of attraction between two objects. f) Force a bar magnet exerts on a piece of iron. Lecture 3 The Laws of Motion OUTLINE 5.1 The Concept of Force 5.2 Newton s First Law and Inertial Frames 5.3 Mass 5.4 Newton s Second Law 5.5 The Gravitational Force and Weight 5.6 Newton s Third Law 5.8

More information

HSC PHYSICS ONLINE B F BA. repulsion between two negatively charged objects. attraction between a negative charge and a positive charge

HSC PHYSICS ONLINE B F BA. repulsion between two negatively charged objects. attraction between a negative charge and a positive charge HSC PHYSICS ONLINE DYNAMICS TYPES O ORCES Electrostatic force (force mediated by a field - long range: action at a distance) the attractive or repulsion between two stationary charged objects. AB A B BA

More information

Isaac Newton. What is the acceleration of the car? "If I have seen further it is by standing on the shoulders of giants" Isaac Newton to Robert Hooke

Isaac Newton. What is the acceleration of the car? If I have seen further it is by standing on the shoulders of giants Isaac Newton to Robert Hooke Aim: What did Isaac Newton teach us about motion? Do Now: 1. A 2009 Ford Mustang convertible is travelling at constant velocity on Interstate 95 south from Philadelphia to Wilmington Delaware. It passes

More information

1 In the absence of a net force, a moving object will. slow down and eventually stop stop immediately turn right move with constant velocity turn left

1 In the absence of a net force, a moving object will. slow down and eventually stop stop immediately turn right move with constant velocity turn left Slide 1 / 51 1 In the absence of a net force, a moving object will slow down and eventually stop stop immediately turn right move with constant velocity turn left Slide 2 / 51 2 When a cat sleeps on a

More information

Welcome back to Physics 211

Welcome back to Physics 211 Welcome back to Physics 211 Today s agenda: Weight Friction Tension 07-1 1 Current assignments Thursday prelecture assignment. HW#7 due this Friday at 5 pm. 07-1 2 Summary To solve problems in mechanics,

More information

WS-CH-4 Motion and Force Show all your work and equations used. Isaac Newton ( )

WS-CH-4 Motion and Force Show all your work and equations used. Isaac Newton ( ) AP PHYSICS 1 WS-CH-4 Motion and Force Show all your work and equations used. Isaac Newton (1643-1727) Isaac Newton was the greatest English mathematician of his generation. He laid the foundation for differential

More information

3. The diagram shows two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart.

3. The diagram shows two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart. 1. Which statement describes the gravitational force and the electrostatic force between two charged particles? A) The gravitational force may be either attractive or repulsive, whereas the electrostatic

More information

PHYSICS 220 Lecture 04 Forces and Motion in 1 D Textbook Sections

PHYSICS 220 Lecture 04 Forces and Motion in 1 D Textbook Sections PHYSICS 220 Lecture 04 Forces and Motion in 1 D Textbook Sections 3.2 3.6 Lecture 4 Purdue University, Physics 220 1 Last Lecture Constant Acceleration x = x 0 + v 0 t + ½ at 2 v = v 0 + at Overview v

More information

Newton s First Law. Newton s Second Law 9/29/11

Newton s First Law. Newton s Second Law 9/29/11 Newton s First Law Any object remains at constant velocity unless acted upon by a net force. AND In order for an object to accelerate, there must be a net force acting on it. Constant velocity could mean

More information

PHYSICS. Chapter 7 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc.

PHYSICS. Chapter 7 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc. PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 7 Lecture RANDALL D. KNIGHT Chapter 7 Newton s Third Law IN THIS CHAPTER, you will use Newton s third law to understand how objects

More information

PS113 Chapter 4 Forces and Newton s laws of motion

PS113 Chapter 4 Forces and Newton s laws of motion PS113 Chapter 4 Forces and Newton s laws of motion 1 The concepts of force and mass A force is described as the push or pull between two objects There are two kinds of forces 1. Contact forces where two

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Diagram 1 A) B - A. B) A - B. C) A + B. D) A B.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Diagram 1 A) B - A. B) A - B. C) A + B. D) A B. Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) In the diagram shown, the unknown vector is 1) Diagram 1 A) B - A. B) A - B. C) A + B.

More information

4 Study Guide. Forces in One Dimension Vocabulary Review

4 Study Guide. Forces in One Dimension Vocabulary Review Date Period Name CHAPTER 4 Study Guide Forces in One Dimension Vocabulary Review Write the term that correctly completes the statement. Use each term once. agent force Newton s second law apparent weight

More information

Chapter 5 Newton s Laws of Motion. Copyright 2010 Pearson Education, Inc.

Chapter 5 Newton s Laws of Motion. Copyright 2010 Pearson Education, Inc. Chapter 5 Newton s Laws of Motion Force and Mass Units of Chapter 5 Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion The Vector Nature of Forces: Forces in Two Dimensions

More information

Isaac Newton ( ) 1687 Published Principia Invented Calculus 3 Laws of Motion Universal Law of Gravity

Isaac Newton ( ) 1687 Published Principia Invented Calculus 3 Laws of Motion Universal Law of Gravity Isaac Newton (1642-1727) 1687 Published Principia Invented Calculus 3 Laws of Motion Universal Law of Gravity Newton s First Law (Law of Inertia) An object will remain at rest or in a constant state of

More information

A Question about free-body diagrams

A Question about free-body diagrams Free-body Diagrams To help us understand why something moves as it does (or why it remains at rest) it is helpful to draw a free-body diagram. The free-body diagram shows the various forces that act on

More information

Exam 2--PHYS 101--F17

Exam 2--PHYS 101--F17 Name: Exam 2--PHYS 0--F7 Multiple Choice Identify the choice that best completes the statement or answers the question.. A ball is thrown in the air at an angle of 30 to the ground, with an initial speed

More information

Physics 101 Lecture 5 Newton`s Laws

Physics 101 Lecture 5 Newton`s Laws Physics 101 Lecture 5 Newton`s Laws Dr. Ali ÖVGÜN EMU Physics Department The Laws of Motion q Newton s first law q Force q Mass q Newton s second law q Newton s third law qfrictional forces q Examples

More information

1. The property of matter that causes an object to resist changes in its state of motion is called:

1. The property of matter that causes an object to resist changes in its state of motion is called: SPH3U Exa Review 1. The property of atter that causes an object to resist changes in its state of otion is called: A. friction B. inertia C. the noral force D. tension 1. The property of atter that causes

More information

P11 Dynamics 1 Forces and Laws of Motion Bundle.notebook October 14, 2013

P11 Dynamics 1 Forces and Laws of Motion Bundle.notebook October 14, 2013 Dynamics 1 Definition of Dynamics Dynamics is the study of why an object moves. In order to understand why objects move, we must first study forces. Forces A force is defined as a push or a pull. Forces

More information

Chapter 4. The Laws of Motion. 1. Force. 2. Newton s Laws. 3. Applications. 4. Friction

Chapter 4. The Laws of Motion. 1. Force. 2. Newton s Laws. 3. Applications. 4. Friction Chapter 4 The Laws of Motion 1. Force 2. Newton s Laws 3. Applications 4. Friction 1 Classical Mechanics What is classical Mechanics? Under what conditions can I use it? 2 Sir Isaac Newton 1642 1727 Formulated

More information

Newton. Galileo THE LAW OF INERTIA REVIEW

Newton. Galileo THE LAW OF INERTIA REVIEW Galileo Newton THE LAW OF INERTIA REVIEW 1 MOTION IS RELATIVE We are moving 0 m/s and 30km/s Find the resultant velocities MOTION IS RELATIVE Position versus Time Graph. Explain how the car is moving.

More information

Unit 2 Forces. Fundamental Forces

Unit 2 Forces. Fundamental Forces Lesson14.notebook July 10, 2013 Unit 2 Forces Fundamental Forces Today's goal: I can identify/name applied forces and draw appropriate free body diagrams (FBD's). There are 4 fundamental forces Gravity

More information

A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?

A hockey puck slides on ice at constant velocity. What is the net force acting on the puck? A hockey puck slides on ice at constant velocity. What is the net force acting on the puck? A. Something more than its weight B. Equal to its weight C. Something less than its weight but more than zero

More information

What is a Force? Free-Body diagrams. Contact vs. At-a-Distance 11/28/2016. Forces and Newton s Laws of Motion

What is a Force? Free-Body diagrams. Contact vs. At-a-Distance 11/28/2016. Forces and Newton s Laws of Motion Forces and Newton s Laws of Motion What is a Force? In generic terms: a force is a push or a pull exerted on an object that could cause one of the following to occur: A linear acceleration of the object

More information

Yanbu University College. General Studies Department. Phsc001 Course (111) Chapter2 (forces) Worksheet Solutions

Yanbu University College. General Studies Department. Phsc001 Course (111) Chapter2 (forces) Worksheet Solutions 1 Yanbu University College General Studies Department Phsc001 Course (111) Chapter2 (forces) Worksheet Solutions 2 Chapter 2 Worksheet Part 1 Matching: Match the definitions with the given concepts. 1.

More information

Chapter 4. Forces in One Dimension

Chapter 4. Forces in One Dimension Chapter 4 Forces in One Dimension Chapter 4 Forces in One Dimension In this chapter you will: *VD Note Use Newton s laws to solve problems. Determine the magnitude and direction of the net force that causes

More information

Exam 1 Stats: Average: 60% Approximate letter grade? Add 10%-12% (This is not a curve) This takes into account the HW, Lab, and Grade Replacement.

Exam 1 Stats: Average: 60% Approximate letter grade? Add 10%-12% (This is not a curve) This takes into account the HW, Lab, and Grade Replacement. Lec 11 Return Exam1 Intro Forces Tuesday, February 19, 2019 1:52 PM Exam 1 Stats: Average: 60% Approximate letter grade? Add 10%-12% (This is not a curve) This takes into account the HW, Lab, and Grade

More information

Physics 2211 ABC Quiz #3 Solutions Spring 2017

Physics 2211 ABC Quiz #3 Solutions Spring 2017 Physics 2211 ABC Quiz #3 Solutions Spring 2017 I. (16 points) A block of mass m b is suspended vertically on a ideal cord that then passes through a frictionless hole and is attached to a sphere of mass

More information

Name: Unit 4 Newton s 1 st & 3 rd Law

Name: Unit 4 Newton s 1 st & 3 rd Law Name: Period: Table #: Unit 4 Newton s 1 st & 3 rd Law 1 UNIT IV: Reading - Force Diagrams The analysis of a problem in dynamics usually involves the selection and analysis of the relevant forces acting

More information

You know the drill: Turn in hw Pick up graded hw Name tags up Grab white boards and markers for your group

You know the drill: Turn in hw Pick up graded hw Name tags up Grab white boards and markers for your group You know the drill: Turn in hw Pick up graded hw Name tags up Grab white boards and markers for your group Missing hw from: Hamilton, Herbig, I. Singh, Midterm #1 on Tuesday, September 24th Covers: Chapter

More information

Chap. 4: Newton s Law of Motion

Chap. 4: Newton s Law of Motion Chap. 4: Newton s Law of Motion And Chap.5 Applying Newton s Laws (more examples) Force; Newton s 3 Laws; Mass and Weight Free-body Diagram (1D) Free-body Diagram (1D, 2 Bodies) Free-body Diagram (2D)

More information

Friction. Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist.

Friction. Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist. Friction Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist. Friction Friction depends on both of the surfaces in contact. When the hockey puck slides on

More information

Free-Body Diagrams: Introduction

Free-Body Diagrams: Introduction Free-Body Diagrams: Introduction Learning Goal: To learn to draw free-body diagrams for various real-life situations. Imagine that you are given a description of a real-life situation and are asked to

More information

Review: Newton s Laws

Review: Newton s Laws More force was needed to stop the rock Review: Newton s Laws F r 1 F r F r 3 F r 4 2 Newton s First Law The velocity of an object does not change unless a force acts on the object Newton s Second Law:

More information

Force a push or a pull exerted on some object the cause of an acceleration, or the change in an objects velocity

Force a push or a pull exerted on some object the cause of an acceleration, or the change in an objects velocity Chapter 4 Physics Notes Changes in Motion Force a push or a pull exerted on some object the cause of an acceleration, or the change in an objects velocity Forces cause changes in velocity Causes a stationary

More information

Q2. A book whose mass is 2 kg rests on a table. Find the magnitude of the force exerted by the table on the book.

Q2. A book whose mass is 2 kg rests on a table. Find the magnitude of the force exerted by the table on the book. AP Physics 1- Dynamics Practice Problems FACT: Inertia is the tendency of an object to resist a change in state of motion. A change in state of motion means a change in an object s velocity, therefore

More information

1. (P2.1A) The picture below shows a ball rolling along a table at 1 second time intervals. What is the object s average velocity after 6 seconds?

1. (P2.1A) The picture below shows a ball rolling along a table at 1 second time intervals. What is the object s average velocity after 6 seconds? PHYSICS FINAL EXAM REVIEW FIRST SEMESTER (01/2017) UNIT 1 Motion P2.1 A Calculate the average speed of an object using the change of position and elapsed time. P2.1B Represent the velocities for linear

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) You are standing in a moving bus, facing forward, and you suddenly fall forward as the

More information

Newton s Laws. A force is simply a push or a pull. Forces are vectors; they have both size and direction.

Newton s Laws. A force is simply a push or a pull. Forces are vectors; they have both size and direction. Newton s Laws Newton s first law: An object will stay at rest or in a state of uniform motion with constant velocity, in a straight line, unless acted upon by an external force. In other words, the bodies

More information

Test Corrections Use these concepts to explain corrected answers. Make sure you apply the concepts to the specific situation in each problem.

Test Corrections Use these concepts to explain corrected answers. Make sure you apply the concepts to the specific situation in each problem. Test Corrections Use these concepts to explain corrected answers. Make sure you apply the concepts to the specific situation in each problem. Circular Motion Concepts When an object moves in a circle,

More information

Forces and Motion. Reference: Prentice Hall Physical Science: Concepts in Action Chapter 12

Forces and Motion. Reference: Prentice Hall Physical Science: Concepts in Action Chapter 12 Forces and Motion Reference: Prentice Hall Physical Science: Concepts in Action Chapter 12 What is Force? A push or pull that acts on an object Can cause a resting object to move Can accelerate a moving

More information

Physics 111 Lecture 4 Newton`s Laws

Physics 111 Lecture 4 Newton`s Laws Physics 111 Lecture 4 Newton`s Laws Dr. Ali ÖVGÜN EMU Physics Department www.aovgun.com he Laws of Motion q Newton s first law q Force q Mass q Newton s second law q Newton s third law q Examples Isaac

More information

66 Chapter 6: FORCE AND MOTION II

66 Chapter 6: FORCE AND MOTION II Chapter 6: FORCE AND MOTION II 1 A brick slides on a horizontal surface Which of the following will increase the magnitude of the frictional force on it? A Putting a second brick on top B Decreasing the

More information

Chapter 5 Newton s Laws of Motion. What determines acceleration on objects?

Chapter 5 Newton s Laws of Motion. What determines acceleration on objects? Chapter 5 Newton s Laws of Motion What determines acceleration on objects? 1 Units of Chapter 5 Force and Mass Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion The

More information

Newton s first and second laws

Newton s first and second laws Lecture 2 Newton s first and second laws Pre-reading: KJF 4.1 to 4.7 Please log in to Socrative, room HMJPHYS1002 Recall Forces are either contact Pushes / Pulls Tension in rope Friction Normal force (virtually

More information

Do Now: Why are we required to obey the Seat- Belt law?

Do Now: Why are we required to obey the Seat- Belt law? Do Now: Why are we required to obey the Seat- Belt law? Newton s Laws of Motion Newton s First Law An object at rest remains at rest and an object in motion remains in motion with the same speed and direction.

More information