Newton s 3 Laws of Motion
|
|
|
- Drusilla Ellis
- 6 years ago
- Views:
Transcription
1 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
2 Newton s First Law (Law of Inertia) An object will remain at rest or in a constant state of motion unless acted upon by external net forces.
3 Statics Problem Find the tensions in the wires. +y +x T T 2 W
4 Newton s 2nd Law F = ma a = F net m The acceleration of object is directly related to the net forces acting on it and inversely proportional to its mass.
5 Problem Starting from rest, Sally pulls Billy on the sled (total mass = 60kg) with a total force of 100 N at an angle of 40 degrees above the horizontal, as shown. After 5 seconds, how fast is the sled moving and how far has it traveled from where it started? F x = ma x F cos θ = ma x F cosθ ax = v f = v0 + at m Fcosθ 100Ncos 40 v f = v0 + at = t = 5 s = 6.38 m / s m 60kg
6 Frictional Forces Friction always opposes the applied force and is in the opposite direction of motion. The greater the normal force the greater the frictional force. f s = µ N s f k = µ k N
7 Statice vs Kinetic Friction f s > f k Fig. 5.16, p.131
8 Problem The magnitude of F 1 is 75.0N and F 2 is 50.0N. The coefficient of friction between the block and the floor is What is the acceleration of the block?
9 a) First of all, which way is the box going to go? You have to figure that out first. To do that compare the x-component of F2 to the x-component of F1. Which is larger? F = F cosθ = 75N cos 65 = 31.7N < 50N = F 1x 1 2 So the box is going to end up moving to the left!!! So I m going to make LEFT the positive x direction in my FBD. Also, since F1 is pushing down, the normal force is going to be larger than the weight!!! F2 should be longer than F1x too. Apply Newton s Second Law: a x Fx F2 F1x 50N 31.7N = = = = 3.66 m/ s m m 5kg b) Now there is friction which will slow it down. You have to know which direction the box is going without friction first because friction ALWAYS acts in the opposite direction to slow it down. You can draw the friction vector at the end of F1x or from the center, your choice. The frictional force is proportional to the normal force. To find that, apply Newton s second law in the y direction: F = N = mg + F = kg m s + N = f = N = N = N y 2 0 1y (5 )(9.8) / 75 sin N, µ 0.04(117 ) a x Fx F2 F1x f 50N 31.7N 4.68 = = = = 2.72 m/ s m m 5kg 2
10 At an instant when a 4.0-kg object has an acceleration equal to (5i + 3j) m/s2, one of the two forces acting on the object is known to be (12i + 22j) N. Determine the magnitude of the other force acting on the object. a. 2.0 N b. 13 N c. 18 N d. 1.7 N e. 20 N
11 Newton s 3rd Law F hand on wall = F wall on hand To every force there is an equal but opposite reaction force.
12 Newton s 3rd Law F hand on wall = F wall on hand You can t TOUCH without being TOUCHED back!!
13 Newton s 3rd Law F hand on wall = F wall on hand To every force there is an equal but opposite reaction force.
14 Newton s 3rd Law F hand on wall = F wall on hand This is an INTERACTIVE Universe.
15
16 Gravity is an Interaction F Earth on Rock = F Rock on Earth
17 Gravity is an Interaction The Earth pulls on you, you pull on the Earth. You fall to the Earth, the Earth Falls to you. You accelerate towards the Earth with g =9.8m/s 2. With what acceleration is the Earth falling towards you? F This is your weight: Earth on You mg a = F = M a = mg You on Earth E M E (65 kg)(9.8 m / s 2 ) a = = 1.1x10 22 m/ s 2 E 5.98x10 24 kg E E
18 Force is not Acceleration Force is the Same! Acceleration is NOT! F Earth on You = F You on Earth a Earth to You = a You to Earth
19 An interaction requires a pair of forces acting on two objects. kick Gun Pushes Bullet out. Bullet Pushes back on Gun (& Man)
20 Action Reaction Pairs kick Gun Pushes Bullet out. Bullet Pushes back on Gun (& Man)
21 Rocket Thrust Rocket Pushes Gas Out. Gas Pushes Back on Rocket.
22 Newton s 3 rd Law Exploding Systems
23 Reading Question 7.3 The propulsion force on a car is due to A. Static friction. B. Kinetic friction. C. The car engine. D. Elastic energy Pearson Education, Inc. Slide 7-14
24 Reading Question 7.3 The propulsion force on a car is due to A. Static friction. B. Kinetic friction. C. The car engine. D. Elastic energy Pearson Education, Inc. Slide 7-15
25 In order to get an object moving, you must push harder on it than it pushes back on you. A) True B) False
26 Question You push a heavy car by hand. The car, in turn, pushes back with an opposite but equal force on you. Doesn t this mean the forces cancel one another, making acceleration impossible? How is it that the car moves? The System Action-Reaction forces act on different objects. For F = ma, the forces must act on ONE object: the system.
27 Interacting Objects If object A exerts a force on object B, then object B exerts a force on object A. The pair of forces, as shown, is called an action/reaction pair. Slide 7-23
28 QuickCheck 7.11 Block A is accelerated across a frictionless table. The string is massless, and the pulley is both massless and frictionless. Which is true? A. Block A accelerates faster in case a than in case b. B. Block A has the same acceleration in case a and case b. C. Block A accelerates slower in case a than in case b Pearson Education, Inc. Slide 7-80
29 QuickCheck 7.11 Block A is accelerated across a frictionless table. The string is massless, and the pulley is both massless and frictionless. Which is true? A. Block A accelerates faster in case a than in case b. B. Block A has the same acceleration in case a and case b. C. Block A accelerates slower in case a than in case b Pearson Education, Inc. Slide 7-81
30 Problem m = 2 kg, m = 3 kg, m = 5kg The three blocks are pushed across a rough surface by a 40-N force. If the coefficient of kinetic friction between each of the blocks and the surface is 0.20, determine the magnitude of the force exerted by m2 on m3. a) 20 N b) 30 N c) 10 N d) 15 N e) 25 N
31 QuickCheck 7.6 Boxes A and B are sliding to the right on a frictionless surface. Hand H is slowing them. Box A has a larger mass than B. Considering only the horizontal forces: A. F B on H = F H on B = F A on B = F B on A B. F B on H = F H on B > F A on B = F B on A C. F B on H = F H on B < F A on B = F B on A D. F H on B = F H on A > F A on B Slide 7-67
32 QuickCheck 7.6 Boxes A and B are sliding to the right on a frictionless surface. Hand H is slowing them. Box A has a larger mass than B. Considering only the horizontal forces: A. F B on H = F H on B = F A on B = F B on A B. F B on H = F H on B > F A on B = F B on A C. F B on H = F H on B < F A on B = F B on A D. F H on B = F H on A > F A on B Slide 7-67
33 Reading Question 7.4 Is the tension in rope 2 greater than, less than, or equal to the tension in rope 1? A. Greater than rope 2. B. Less than rope 2. C. Equal to rope Pearson Education, Inc. Slide 7-16
34 Reading Question 7.4 Is the tension in rope 2 greater than, less than, or equal to the tension in rope 1? A. Greater than rope 2. B. Less than rope 2. C. Equal to rope Pearson Education, Inc. Slide 7-17
35 QuickCheck 7.8 The two masses are at rest. The pulleys are frictionless. The scale is in kg. The scale reads A. 0 kg. B. 5 kg. C. 10 kg. Slide 7-73
36 QuickCheck 7.8 The two masses are at rest. The pulleys are frictionless. The scale is in kg. The scale reads A. 0 kg. B. 5 kg. C. 10 kg. Slide 7-74
37 Tension Forces Tension forces are transmitted undiminished through the rope. Different T Same T
38 QuickCheck 7.7 All three 50-kg blocks are at rest. The tension in rope 2 is A. greater than the tension in rope 1. B. equal to the tension in rope 1. C. less than the tension in rope Pearson Education, Inc. Slide 7-71
39 QuickCheck 7.7 All three 50-kg blocks are at rest. The tension in rope 2 is A. greater than the tension in rope 1. B. equal to the tension in rope 1. C. less than the tension in rope 1. Each block is in static equilibrium, with Pearson Education, Inc. Slide 7-72
40 Find the acceleration and tension of the system Pearson Education, Inc. Slide 7-75
41 QuickCheck 7.5 Boxes A and B are being pulled to the right on a frictionless surface. Box A has a larger mass than B. How do the two tension forces compare? A. T 1 > T 2 B. T 1 = T 2 C. T 1 < T 2 D. Not enough information to tell Pearson Education, Inc. Slide 7-61
42 QuickCheck 7.5 Boxes A and B are being pulled to the right on a frictionless surface. Box A has a larger mass than B. How do the two tension forces compare? A. T 1 > T 2 B. T 1 = T 2 C. T 1 < T 2 D. Not enough information to tell Pearson Education, Inc. Slide 7-62
43 Pulleys Block B drags block A across a frictionless table as it falls. The string and the pulley are both massless. There is no friction where the pulley turns on its axle. Therefore, T A on S = T B on S Pearson Education, Inc. Slide 7-69
44 Pulleys Since T A on B = T B on A, we can draw the simplified freebody diagram on the right, below. Forces and act as if they are in an action/reaction pair, even though they are not opposite in direction because the tension force gets turned by the pulley Pearson Education, Inc. Slide 7-70
45 Pulleys, Masses, Strings What is the acceleration of the system? (If they are connected, it is the same for both masses!) What is the tension in the string? 1. If it falls from rest 2. If it is dragged to the left 3. If the string is cut FIRST: Draw free-body diagrams for each mass!!! 2013 Pearson Education, Inc.
46 Problem A force F = 40 N pulls the two masses. If the table is frictionless, find the tension in the string. m = 3 kg, m = 1.5kg a) 13 N b) 36 N c) 23 N d) 15 N e) 28 N 1 2
47 QuickCheck 7.10 The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is A. T < mg. B. T = mg. C. T > mg Pearson Education, Inc. Slide 7-78
48 QuickCheck 7.10 The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is A. T < mg. B. T = mg. C. T > mg Tension has to be less than mg for the block to have a downward acceleration Pearson Education, Inc. Slide 7-79
49 Force Vector Diagrams Draw free-body diagrams for every object! Note: T and a are the same! Ropes connected by ideal pulleys have the same tension everywhere!
50 Pulleys, Masses, Strings What is the acceleration of the system? (If they are connected, it is the same for both masses!) What is the tension in the string? 1. If it falls from rest 2. If it is dragged to the left 3. If the string is cut FIRST: Draw free-body diagrams for each mass!!! 2013 Pearson Education, Inc.
51 Problem A constant force F pulls the system as shown. The pulleys are frictionless. The coefficient of kinetic friction between the block and the table is µ. a) Draw free body diagrams for both masses. b) Find an expression for the acceleration in terms of the given variables.
52 HW Problem In the figure shown, the coefficient of kinetic friction between the block and the incline is What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley. Draw the free body diagrams for each mass. Derive a general solution for the acceleration in terms of M, and g, box it, then put the numbers in and get a numerical value then box that too. Then find a numerical value for the tension in the string. Box that. Show all your work and make it pretty! Use 3 significant figures. 2M 30 M
53 Tension Two 10 N weights are pulling on the spring scale as shown (the right side is attached to a hook, the left side is attached to the body of the scale) What does the scale read? a) 0 N b) 10 N c) 20 N
54 Force Vector Diagrams Align axes to simplify the problem!
55 QuickCheck 7.1 A mosquito runs head-on into a truck. Splat! Which is true during the collision? A. The mosquito exerts more force on the truck than the truck exerts on the mosquito. B. The truck exerts more force on the mosquito than the mosquito exerts on the truck. C. The mosquito exerts the same force on the truck as the truck exerts on the mosquito. D. The truck exerts a force on the mosquito but the mosquito does not exert a force on the truck. E. The mosquito exerts a force on the truck but the truck does not exert a force on the mosquito. Slide 7-39
56 QuickCheck 7.1 A mosquito runs head-on into a truck. Splat! Which is true during the collision? A. The mosquito exerts more force on the truck than the truck exerts on the mosquito. B. The truck exerts more force on the mosquito than the mosquito exerts on the truck. C. The mosquito exerts the same force on the truck as the truck exerts on the mosquito. D. The truck exerts a force on the mosquito but the mosquito does not exert a force on the truck. E. The mosquito exerts a force on the truck but the truck does not exert a force on the mosquito. Slide 7-40
57 QuickCheck 7.2 A mosquito runs head-on into a truck. Which is true during the collision? A. The magnitude of the mosquito s acceleration is larger than that of the truck. B. The magnitude of the truck s acceleration is larger than that of the mosquito. C. The magnitude of the mosquito s acceleration is the same as that of the truck. D. The truck accelerates but the mosquito does not. E. The mosquito accelerates but the truck does not. Slide 7-41
58 QuickCheck 7.2 A mosquito runs head-on into a truck. Which is true during the collision? A. The magnitude of the mosquito s acceleration is larger than that of the truck. B. The magnitude of the truck s acceleration is larger than that of the mosquito. C. The magnitude of the mosquito s acceleration is the same as that of the truck. D. The truck accelerates but the mosquito does not. E. The mosquito accelerates but the truck does not. Newton s second law: Don t confuse cause and effect! The same force can have very different effects. Slide 7-42
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
Chapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued 4.9 Static and Kinetic Frictional Forces When an object is in contact with a surface forces can act on the objects. The component of this force acting
3/17/2018. Interacting Objects. Interacting Objects
Example 0 - Iris drags a sled containing her baby brother across the floor at a constant speed. She pulls the sled at a 20 degree above the horizontal. Draw a FBD and write out N2L for both x and y directions.
Chapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued Quiz 3 4.7 The Gravitational Force Newton s Law of Universal Gravitation Every particle in the universe exerts an attractive force on every other
General Physics I Spring Applying Newton s Laws
General Physics I Spring 2011 pplying Newton s Laws 1 Friction When you push horizontally on a heavy box at rest on a horizontal floor with a steadily increasing force, the box will remain at rest initially,
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
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
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
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
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
CHAPTER 4 NEWTON S LAWS OF MOTION
62 CHAPTER 4 NEWTON S LAWS O MOTION CHAPTER 4 NEWTON S LAWS O MOTION 63 Up to now we have described the motion of particles using quantities like displacement, velocity and acceleration. These quantities
Newton s Third Law. Lecture 9. Chapter 7. Physics I. Course website:
Lecture 9 Physics I Chapter 7 Newton s Third Law Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsi Today we are going to discuss: Chapter 7: Some leftover (Ch.6) Interacting Objects:
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,
Conceptual Physics Fundamentals. Chapter 4: NEWTON S LAWS OF MOTION
Conceptual Physics Fundamentals Chapter 4: NEWTON S LAWS OF MOTION This lecture will help you understand: Newton s First Law of Motion Newton s Second Law of Motion Forces and Interactions Newton s Third
Reading Quiz. Chapter 5. Physics 111, Concordia College
Reading Quiz Chapter 5 1. The coefficient of static friction is A. smaller than the coefficient of kinetic friction. B. equal to the coefficient of kinetic friction. C. larger than the coefficient of kinetic
Solution of HW4. and m 2
Solution of HW4 9. REASONING AND SOLUION he magnitude of the gravitational force between any two of the particles is given by Newton's law of universal gravitation: F = Gm 1 m / r where m 1 and m are the
Lecture Presentation. Chapter 4 Forces and Newton s Laws of Motion. Chapter 4 Forces and Newton s Laws of Motion. Reading Question 4.
Chapter 4 Forces and Newton s Laws of Motion Lecture Presentation Chapter 4 Forces and Newton s Laws of Motion Chapter Goal: To establish a connection between force and motion. Slide 4-2 Chapter 4 Preview
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
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
Question 01. A. Incorrect! This is not Newton s second law.
College Physics - Problem Drill 06: Newton s Laws of Motion Question No. 1 of 10 1. Which of the options best describes the statement: Every object continues in a state of rest or uniform motion in a straight
Main points of today s lecture: Normal force Newton s 3 d Law Frictional forces: kinetic friction: static friction Examples. Physic 231 Lecture 9
Main points of today s lecture: Normal force Newton s 3 d Law Frictional forces: kinetic friction: static friction Examples. Physic 3 Lecture 9 f N k = µ k f N s < µ s Atwood s machine Consider the Atwood
Chapter 4: Newton s Second Law F = m a. F = m a (4.2)
Lecture 7: Newton s Laws and Their Applications 1 Chapter 4: Newton s Second Law F = m a First Law: The Law of Inertia An object at rest will remain at rest unless, until acted upon by an external force.
Figure 5.1a, b IDENTIFY: Apply to the car. EXECUTE: gives.. EVALUATE: The force required is less than the weight of the car by the factor.
51 IDENTIFY: for each object Apply to each weight and to the pulley SET UP: Take upward The pulley has negligible mass Let be the tension in the rope and let be the tension in the chain EXECUTE: (a) The
PSI AP Physics B Dynamics
PSI AP Physics B Dynamics Multiple-Choice questions 1. After firing a cannon ball, the cannon moves in the opposite direction from the ball. This an example of: A. Newton s First Law B. Newton s Second
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
Lecture 5. Dynamics. Forces: Newton s First and Second
Lecture 5 Dynamics. Forces: Newton s First and Second What is a force? It s a pull or a push: F F Force is a quantitative description of the interaction between two physical bodies that causes them to
HATZIC SECONDARY SCHOOL
HATZIC SECONDARY SCHOOL PROVINCIAL EXAMINATION ASSIGNMENT VECTOR DYNAMICS MULTIPLE CHOICE / 45 OPEN ENDED / 75 TOTAL / 120 NAME: 1. Unless acted on by an external net force, an object will stay at rest
Physics Mechanics. Lecture 11 Newton s Laws - part 2
Physics 170 - Mechanics Lecture 11 Newton s Laws - part 2 Newton s Second Law of Motion An object may have several forces acting on it; the acceleration is due to the net force: Newton s Second Law of
Lecture Outline Chapter 6. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.
Lecture Outline Chapter 6 Physics, 4 th Edition James S. Walker Chapter 6 Applications of Newton s Laws Units of Chapter 6 Frictional Forces Strings and Springs Translational Equilibrium Connected Objects
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
Chapter 3 The Laws of motion. The Laws of motion
Chapter 3 The Laws of motion The Laws of motion The Concept of Force. Newton s First Law. Newton s Second Law. Newton s Third Law. Some Applications of Newton s Laws. 1 5.1 The Concept of Force Force:
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:
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
Webreview practice test. Forces (again)
Please do not write on test. ID A Webreview 4.3 - practice test. Forces (again) Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A 5.0-kg mass is suspended
University Physics (Prof. David Flory) Chapt_06 Saturday, October 06, 2007 Page 1
University Physics (Prof. David Flory) Chapt_06 Saturday, October 06, 2007 Page 1 Name: Date: 1. A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction
8.01x Classical Mechanics, Fall 2016 Massachusetts Institute of Technology. Problem Set 2
8.01x Classical Mechanics, Fall 2016 Massachusetts Institute of Technology 1. Stacked Blocks Problem Set 2 Consider two blocks that are resting one on top of the other. The lower block has mass m 2 = 4.8
Sara Rwentambo. PHYS 1007 AB
Topics: Free body diagrams (FBDs) Static friction and kinetic friction Tension and acceleration of a system Tension in dynamic equilibrium (bonus question) Opener: Find Your Free Body Diagram Group Activity!
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
REVISING MECHANICS (LIVE) 30 JUNE 2015 Exam Questions
REVISING MECHANICS (LIVE) 30 JUNE 2015 Exam Questions Question 1 (Adapted from DBE November 2014, Question 2) Two blocks of masses 20 kg and 5 kg respectively are connected by a light inextensible string,
PreClass Notes: Chapter 5, Sections
PreClass Notes: Chapter 5, Sections 5.1-5.3 From Essential University Physics 3 rd Edition by Richard Wolfson, Middlebury College 2016 by Pearson Education, Inc. Narration and extra little notes by Jason
Practice. Newton s 3 Laws of Motion. Recall. Forces a push or pull acting on an object; a vector quantity measured in Newtons (kg m/s²)
Practice A car starts from rest and travels upwards along a straight road inclined at an angle of 5 from the horizontal. The length of the road is 450 m and the mass of the car is 800 kg. The speed of
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
variable Formula S or v SI variable Formula S or v SI 4. How is a Newton defined? What does a Newton equal in pounds?
Newton s Laws 1 1. Define mass variable Formula S or v SI 2. Define inertia, how is inertia related to mass 3. What is a Force? variable Formula S or v SI 4. How is a Newton defined? What does a Newton
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.
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
You may use g = 10 m/s 2, sin 60 = 0.87, and cos 60 = 0.50.
1. A child pulls a 15kg sled containing a 5kg dog along a straight path on a horizontal surface. He exerts a force of a 55N on the sled at an angle of 20º above the horizontal. The coefficient of friction
1. Draw a FBD of the toy plane if it is suspended from a string while you hold the string and move across the room at a constant velocity.
1. Draw a FBD of the toy plane if it is suspended from a string while you hold the string and move across the room at a constant velocity. 2. A 15 kg bag of bananas hangs from a taunt line strung between
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
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.
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
Newton s Laws Pre-Test
Newton s Laws Pre-Test 1.) Consider the following two statements and then select the option below that is correct. (i) It is possible for an object move in the absence of forces acting on the object. (ii)
Review: Advanced Applications of Newton's Laws
Review: Advanced Applications of Newton's Laws 1. The free-body diagram of a wagon being pulled along a horizontal surface is best represented by a. A d. D b. B e. E c. C 2. The free-body diagram of a
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
Forces. Isaac Newton stated 3 laws that deal with forces and describe motion. Backbone of Physics
FORCES Forces Isaac Newton stated 3 laws that deal with forces and describe motion. Backbone of Physics Inertia Tendency of an object to remain in the same state of motion. Resists a change in motion.
Forces and Newton s Laws Notes
Forces and Newton s Laws Notes Force An action exerted on an object which can change the motion of the object. The SI unit for force is the Newton (N) o N = (kg m)/s 2 o Pound is also a measure of force
Newton s Laws of Motion
Newton s Laws of Motion Observation #1 An object at rest remains at rest, unless something makes it move. Observation #2 A object in motion continues in motion with constant velocity, unless something
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
Physics 111. Lecture 15 (Walker: 7.1-2) Work & Energy March 2, Wednesday - Midterm 1
Physics 111 Lecture 15 (Walker: 7.1-2) Work & Energy March 2, 2009 Wednesday - Midterm 1 Lecture 15 1/25 Work Done by a Constant Force The definition of work, when the force is parallel to the displacement:
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
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.
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
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,
CHAPTER 2. FORCE and Motion. CHAPTER s Objectives
19 CHAPTER 2 FORCE and Motion CHAPTER s Objectives To define a force To understand the relation between force and motion In chapter 1, we understood that the Greek philosopher Aristotle was the first who
Chapters 5-6. Dynamics: Forces and Newton s Laws of Motion. Applications
Chapters 5-6 Dynamics: orces and Newton s Laws of Motion. Applications 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,
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
Newton s Laws and Free-Body Diagrams General Physics I
Newton s Laws and Free-Body Diagrams In the next few sections, we will be exploring some of the most fundamental laws of our universe, laws that govern the relationship actions and motion. These laws are
Physics Exam 2 October 11, 2007
INSTRUCTIONS: Write your NAME on the front of the blue exam booklet. The exam is closed book, and you may have only pens/pencils and a calculator (no stored equations or programs and no graphing). Show
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
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
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)
Fraser Heights Secondary Physics 11 Mr. Wu Practice Test (Dynamics)
Fraser Heights Secondary Physics 11 Mr. Wu Practice Test (Dynamics) Instructions: Pick the best answer available for Part A. Show all your work for each question in Part B Part A: Multiple-Choice 1. Inertia
Lecture 6. Applying Newton s Laws Free body diagrams Friction
Lecture 6 Applying Newton s Laws Free body diagrams Friction ACT: Bowling on the Moon An astronaut on Earth kicks a bowling ball horizontally and hurts his foot. A year later, the same astronaut kicks
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
Physics 2211 M Quiz #2 Solutions Summer 2017
Physics 2211 M Quiz #2 Solutions Summer 2017 I. (16 points) A block with mass m = 10.0 kg is on a plane inclined θ = 30.0 to the horizontal, as shown. A balloon is attached to the block to exert a constant
Example. F and W. Normal. F = 60cos 60 N = 30N. Block accelerates to the right. θ 1 F 1 F 2
Physic 3 Lecture 7 Newton s 3 d Law: When a body exerts a force on another, the second body exerts an equal oppositely directed force on the first body. Frictional forces: kinetic friction: fk = μk N static
Examples Newton's Laws and Friction
Examples Newton's Laws and Friction 1. A 10.0 kg box is sitting on a table. (A) If a 49 N force is required to overcome friction and start the block moving, calculate the coefficient of static friction.
Physics 4A Chapter 5: Force and Motion and Chapter 6: Dynamics I: Motion Along a Line
Physics 4A Chapter 5: Force and Motion and Chapter 6: Dynamics I: Motion Along a Line Conceptual Questions and Example Problems from Chapters 5 and 6 Conceptual Question 5.7 An object experiencing a constant
Two Hanging Masses. ) by considering just the forces that act on it. Use Newton's 2nd law while
Student View Summary View Diagnostics View Print View with Answers Edit Assignment Settings per Student Exam 2 - Forces [ Print ] Due: 11:59pm on Tuesday, November 1, 2011 Note: To underst how points are
Work and energy. 15 m. c. Find the work done by the normal force exerted by the incline on the crate.
Work and energy 1. A 10.0-kg crate is pulled 15.0 m up along a frictionless incline as shown in the figure below. The crate starts at rest and has a final speed of 6.00 m/s. motor 15 m 5 a. Draw the free-body
Lecture 4. Newton s 3rd law and Friction
Lecture 4 Newton s 3rd law and Friction Newtons First Law or Law of Inertia If no net external force is applied to an object, its velocity will remain constant ("inert"). OR A body cannot change its state
Chapter 5. The Laws of Motion
Chapter 5 The Laws of Motion The Laws of Motion The description of an object in motion included its position, velocity, and acceleration. There was no consideration of what might influence that motion.
The Laws of Motion. Newton s first law Force Mass Newton s second law Gravitational Force Newton s third law Examples
The Laws of Motion Newton s first law Force Mass Newton s second law Gravitational Force Newton s third law Examples Gravitational Force Gravitational force is a vector Expressed by Newton s Law of Universal
QuickCheck 1.5. An ant zig-zags back and forth on a picnic table as shown. The ant s distance traveled and displacement are
APPY1 Review QuickCheck 1.5 An ant zig-zags back and forth on a picnic table as shown. The ant s distance traveled and displacement are A. 50 cm and 50 cm B. 30 cm and 50 cm C. 50 cm and 30 cm D. 50 cm
Review. Kinetic Energy Work Hooke s s Law Potential Energy Conservation of Energy Power 1/91
Review Kinetic Energy Work Hooke s s Law Potential Energy Conservation of Energy Power 1/91 The unit of work is the A. Newton B. Watt C. Joule D. Meter E. Second 2/91 The unit of work is the A. Newton
PHYS 101 Previous Exam Problems. Force & Motion I
PHYS 101 Previous Exam Problems CHAPTER 5 Force & Motion I Newton s Laws Vertical motion Horizontal motion Mixed forces Contact forces Inclines General problems 1. A 5.0-kg block is lowered with a downward
Connected Bodies 1. Two 10 kg bodies are attached to a spring balance as shown in figure. The reading of the balance will be 10 kg 10 kg 1) 0 kg-wt ) 10 kg-wt 3) Zero 4) 5 kg-wt. In the given arrangement,
NAME. (2) Choose the graph below that represents the velocity vs. time for constant, nonzero acceleration in one dimension.
(1) The figure shows a lever (which is a uniform bar, length d and mass M), hinged at the bottom and supported steadily by a rope. The rope is attached a distance d/4 from the hinge. The two angles are
Phys101 Second Major-131 Zero Version Coordinator: Dr. A. A. Naqvi Sunday, November 03, 2013 Page: 1
Coordinator: Dr. A. A. Naqvi Sunday, November 03, 2013 Page: 1 Q1. Two forces are acting on a 2.00 kg box. In the overhead view of Figure 1 only one force F 1 and the acceleration of the box are shown.
End-of-Chapter Exercises
End-of-Chapter Exercises For all these exercises, assume that all strings are massless and all pulleys are both massless and frictionless. We will improve our model and learn how to account for the mass
4.6 Free Body Diagrams 4.7 Newton's Third Law.notebook October 03, 2017
Free Body Diagrams Section 4.6 Free Body Diagrams Text: p. 112 QuickCheck 4.11 An elevator, lifted by a cable, is moving upward and slowing. Which is QuickCheck 4.11 An elevator, lifted by a cable, is
Previewer Tools Hide All
Assignment Previewer Forces & Newton's Laws of Motion (496767) Previewer Tools Show All Hide All In View: Key Close this window Hidden: Assignment Score Mark Help/Hints Solution Show New Randomization
Forces. 3. The graph given shows the weight of three objects on planet X as a function of their mass. A. 0 N. B. between 0 N and 12 N C.
Name: Date: 1. When a 12-newton horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of static friction acting on the box is 3. The graph given shows the weight
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
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
Force. The cause of an acceleration or change in an object s motion. Any kind of a push or pull on an object.
Force The cause of an acceleration or change in an object s motion. Any kind of a push or pull on an object. Forces do not always give rise to motion. Forces can be equal and opposite. Force is a vector
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
LECTURE 12 FRICTION, STRINGS & SPRINGS. Instructor: Kazumi Tolich
LECTURE 12 FRICTION, STRINGS & SPRINGS Instructor: Kazumi Tolich Lecture 12 2! Reading chapter 6-1 to 6-4! Friction " Static friction " Kinetic friction! Strings! Pulleys! Springs Origin of friction 3!!
Physics 2514 Lecture 13
Physics 2514 Lecture 13 P. Gutierrez Department of Physics & Astronomy University of Oklahoma Physics 2514 p. 1/18 Goals We will discuss some examples that involve equilibrium. We then move on to a discussion
1N the force that a 100g bar of chocolate exerts on your hand.
Forces: - - > cause change in motions Newton's first law = law of inertia In absence of a net external force acting upon it, a body will either remain at rest or continue in its rectilinear uniform motion.
Physics 1100: 2D Kinematics Solutions
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Physics 1100: 2D Kinematics Solutions 1. In the diagrams below, a ball is on a flat horizontal surface. The initial velocity