Chapter Four Holt Physics. Forces and the Laws of Motion


 Marjorie Fitzgerald
 4 years ago
 Views:
Transcription
1 Chapter Four Holt Physics Forces and the Laws of Motion
2 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, change shape of object. Originally described by Sir Isaac Newton as F=ma Dynamics= the connection between force and motion
3 Physics Force and the study of dynamics b. Four basic types (1) gravitational  weakest, attractive force between objects (2) electromagnetic  results from basic property of particles. Large compared to gravitational (3) strong nuclear forces  holds nucleus together, limited in range. (4) weak nuclear  deals with radiation.
4 Physics Force and the study of dynamics c. Also classified by how they act (1) contact forces act due to physical contact between objects. Push/pull. (2) field forces do not require contact  such as gravitational forces, electromagnetic forces, nuclear forces fields  regions around an object that are influenced by a characteristic of the object  mass, magnetic, etc.
5 Physics Force and the study of dynamics d. Unit of Force in the SI system is the Newton (N) (1) one Newton is the force required to give a mass of one kilogram an acceleration of one meter per second squared. (2) 1 N = 1 kgm / s 2 derived unit (3) 1 dyne = 1 gcm/sec 2 cgs system (4) 1 lb = 1 slugft/sec 2 British Engineering System
6 Physics Force and the study of dynamics (5) Conversions (a) 1 lb = N (b) 1 N = lb c) 1 N = 10 5 dynes Example: What is the Newton force of a 2 lb bar? 2lbs * 4.448N = 8.896N 1 1lbs
7 2.FreeBody Diagrams a. A technique to use in solving problems (1) Sketch object under consideration  Rather than drawing a pictorial representation of an object just show it as a box, square, or circle. Physics Force and the study of dynamics
8 (2) Draw and label all external forces acting on object as vector arrows (a) Assume a direction for each force. If your selection ends up negative() means it goes the other way (b) Assume that all forces act at the center of mass of an object. No matter where they act they are shown as acting at the center. (3) forces that the object exerts on other objects, its surroundings, are not shown. Only those that act ON the object. Label arrows/forces The size of the vector arrow indicates the magnitude of the force. Physics Force and the study of dynamics
9 Overview of Types of Forces  Labels of freebody diagrams 1. Applied Force= force applied to an object by a person or another object. Example: a person pushes a desk across the room, applied force acting upon the desk. 2. Gravity=force by which the earth, moon, or any other planet/massive object attracts another object toward itself. Downward pull towards the center, on earth. 3. Normal Force= support force exerted upon an object that is in contact with another stable object. Example: an object is resting on a surface, then the surface is exerting an upward force upon the object in order to support its weight. 4. Friction Force= force exerted by a surface as an object moves across it. The two types of friction are kinetic and static friction. 5. Air Resistance= acts upon objects as they travel through the air. Often opposes the motion of an object, but is frequently neglected due to negligible magnitude. Example: the force that slows a skydiver while he is falling. 6. Tension=transmitted through a string, rope, cable or wire when pulled tight by forces from opposite ends 7. Spring Force= force exerted by a compressed or stretched spring upon any object that is attached to it. The object that is compressed or stretched is also acted upon by a restoring force that restores it to rest or equilibrium position (Hooke s Law)
10 Labeling forces  Examples F n F f F app F g F n F n F app F g F g F n F tens F n F g F g
11 Physics Force and the study of dynamics Use a freebody diagram to determine the net external force acting on the object. The size of the vector arrow indicates the magnitude of the force.
12 Constructing freebody diagrams  Examples
13 Freebody diagram  Practice Draw a force diagram of a crashtest dummy in a car at the moment of collision. For this problem, assume that the forces acting on the car are N downward, N forward, and N backward. F net x = 17,800N + (25,000N) = 7200N Rtor 7200N Lt F net y = 19,600N + (19,600N) = 7200 Draw a freebody diagram of a football being kicked. Assume that the only forces acting on the ball are the force of gravity and the force exerted by the kicker.
14
15 Newton's First Law  Law of Inertia a. Net external force  combination of all forces acting on an object, a vector sum. b. Two parts  body at rest, body in motion c. An object at rest will remain at rest, and an object in uniform motion remains in uniform motion, unless acted upon by a net external force.
16 d. inertia depends on object's mass, so mass is the measure of inertia  which is the tendency of an object not to accelerate. (1) mass is the amount of matter in an object (2) mass also measures the amount of inertia an object has
17 Newton's Second Law a. F = m a but more easily understood by a = F / m b. acceleration is directly proportional to the net external force applied to the object and inversely proportional to mass of object. c. second law is a vector equation  direction of acceleration is the same direction as the net force
18 Newton s 2 nd Law Example
19 Newton's Third Law  Action/Reaction a. forces always occur in pairs. b. If two bodies interact, the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1, and these forces are opposite in direction. c. Two bodies, two forces  key is to recognize what the forces are
20 d. When the net external force acting on an object is zero, its acceleration is zero. (1) NOTE: key concept is net external force  if it is zero then the object s motion is not changing. (2) NOTE: motion can be occurring if the object has a zero net force acting  but that motion does not change in magnitude or direction.
21 g. Equilibrium  net force acting on an object is zero 1. Forces are acting but they cancel each other out 2. Object is at rest or is moving at a constant velocity  which means its speed is not changing nor is its direction of motion.
22 6. Mass and Weight a. weight  due to gravitational force (1) w = m g (F=ma) (2) direction is downward b. mass  amount of matter in an object. Two types: inertial and gravitational (1) inertial mass  measured using m = F / a (a) force needed to accelerate an object gives mass (b) difficult to do  frictionless surface and measuring acceleration
23 (2) gravitational mass (a) measured using a pan balance to compare weights of two objects (b) unknown mass on one side, known mass on the other (c) essentially different concepts, always numerically equal. Equality of the two types is called the "equivalence principle" (d) weight is a vector, mass is a scalar
24 7. Normal Force  F N a. A contact force exerted by one object on another in a direction perpendicular to the surface of contact. b. normal is a mathematical term meaning the force is perpendicular. c. a reaction force  but one that does act on an object.
25 8. Friction a. A force that opposes the motion of two objects that are touching each other b. An electromagnetic force resulting from temporary attractions between the contact points of the two surfaces c. friction always acts parallel to the surfaces in contact and in a direction opposing motion
26 d. Two main types (1) Static Friction  force of friction resisting the start of motion. Varies in magnitude depending on the applied force trying to start motion. (2) Kinetic (Sliding) Friction  force resisting existing motion (3) Static friction is always larger than sliding friction (4) We will work mainly with kinetic friction
27 e. Coefficient of Friction (µ) = F f / F N (1) F N represents the normal force. The force pulling the surfaces together. It is always perpendicular to the surfaces in contact. (2) F f is the force of sliding friction. It is parallel to the surfaces in contact and in the opposite direction from motion
28 f. Example: a box being pulled at a constant speed over a level surface. F N F f F Applied F weight
29 (1) since constant speed  no acceleration, forces are balanced (2) not moving off surface so sum of forces in y direction is equal to 0 (3) force of friction depends only on the nature of the surfaces in contact and Normal Force. (4) coefficient of friction (µ) is independent of the surface areas in contact and the velocity of the object
30 g. Example: A smooth wooden block is placed on a smooth wooden tabletop. A force of 14 N is necessary to keep the 40N object moving at a constant speed. (1) Find coefficient of friction (µ) (2) If a 20.0N weight is placed on the block what force will be required to keep the block and weight moving at a constant velocity.
31 Given: W = 40N F A = 14N F f = 14N since constant velocity F N = 40N, since object not being raised F f = µ F N F =14N F N = 40N F f =14N W = 40N
32 9. Net Force Causes Acceleration a. Net force is the vector sum of all forces acting on a body F net = F applied + F friction b. Ex: Consider a mass of 50 kg sitting on a frictionless surface. A force of 100N is applies. Find a.
33 Given: m =50kg F APPLIED = 100N F friction = 0 F = m a A = F / m a = 2 m/s 2 c. If in the above problem µ is 0.2, find a.
34 F friction = µ F N = 0.2 (50kg x 9.8 m/s 2 ) and it opposes motion of applied force F Net = 100N + (98N) =2N a=.04m/s 2 F applied = 100N F friction = 98N
35 d. Student Problem. A shopper in a supermarket cart pushes a loaded cart with a horizontal force of 10.0N. If the cart has a mass of 30.0 kg, how far will it move in 3 sec, starting from rest if (1) you ignore friction (2) if the shopper places his 30.0 N child in the cart before he pushes it?
36 Answer: F = m a a = 1/3 m/ s 2 s = v 0 t + 1/2 at 2
37 e. Elevator Problems (1) elevator at rest  weight reading on the scale is from the normal force of the scale pushing back up on the object which is pushing down due to gravity (2) with elevator at rest, a Y = 0 and ΣF Y = 0 scale weight normal force ΣF Y = 0 = F N  W F N = W
38 (3) elevator moving up, a Y = +n & ΣF Y =m a Y weight ΣF Y = m a Y = F N  W F N = apparent weight= = W + m a Y normal force
39 (4) elevator moving down, a Y = n & ΣF Y =m a Y weight ΣF Y = m a Y = F N  W F N = apparent weight= = W  m a Y normal force
40 10. Terminal Velocity a. constant velocity when F drag = W b. Air resistance is a frictional force c. depends on the density of air, size and shape of the object, and speed of motion
41 11. Force at an angle problems Derek leaves his physics book on top of a drafting table that is inclined at a 35 angle. The free body diagram in Figure 48 shows the forces acting on the book. Find the net external force acting on the book, and determine whether the book will remain at rest in this position.
42 1. Define the problem and identify the variables. Given: F gravity on book = 22 N F friction = 11 N F table on book = 18 N Unknown: F net =? 2. Select a coordinate system, and apply it to the freebody diagram. Choose the xaxis parallel to and the y axis perpendicular to the incline of the table, as shown in Figure 49. This is the most convenient coordinate system because only the force of gravity on the book needs to be resolved into x and y components. All other forces are either along the x axis or the yaxis.
43 3. Find the x and y components of all vectors. Draw a sketch as shown in Figure 410 to help find the x component and y component of the vector F gravityonbook Gravity acts at a 90 angle to the surface of Earth, and the x axis is at a 35 angle to Earth s surface. Therefore, θ, the angle between the gravity vector and the x axis, is the third angle in this right triangle and is equal to 55.
44 4. Find the net external force in both the x and y directions. Figure 412 shows another freebody diagram of the book, now with forces acting only along the x and y axes.
45 5. Find the net external force. The net force in the y direction is equal to zero, so the net external force is equal to the net force in the positive x direction, 2 N positive. 6. Evaluate your answer. The net external force acts on the book in the downhill direction. Therefore, the book will experience an acceleration in the downhill direction, and it will slide off the table, as shown Figure 413.
46 12. Twobody Problems a. To solve a problem involving two or more bodies write F = ma for each body separately, having first decided which direction of motion you want to designate as positive. b. Both objects will have same acceleration, just different directions
47 Equilibrium Problems c. Example: Two masses are tied to opposite ends of a massless rope, and the rope is hung over a massless and frictionless pulley. Find the acceleration of the masses.
48 (1) 15 kg mass falls, turns CW, so designate down as positive motion for 15 kg object and upward as positive for 10 kg object. (2) Draw freebody diagrams (3) Note tension is the same throughout the rope 10 kg 15 kg
49 (4) T  98N = 10kg (a) 147N  T = 15kg (a) T T two equations with two unknowns T and a w = 98 N W = 147 N
Free Body Diagram Practice
Name: Free Body Diagram Practice Per: Read each scenario and draw a diagram of the forces acting upon the object(s). 1. A book is at rest on a table top. Diagram the forces acting on the book. 2. A girl
More informationForce. 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
More informationCHAPTER 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
More informationIsaac Newton ( ) 1687 Published Principia Invented Calculus 3 Laws of Motion Universal Law of Gravity
Isaac Newton (16421727) 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 informationChapter 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:
More informationCircular 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 informationChapter 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.
More informationChapter 4. The Laws of Motion
Chapter 4 The Laws of Motion Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not
More informationPS113 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 informationThe 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 informationChapter 4. The Laws of Motion
Chapter 4 The Laws of Motion Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not
More informationPractice. 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
More informationChapter 5 Force and Motion
Chapter 5 Force and Motion Chapter Goal: To establish a connection between force and motion. Slide 52 Chapter 5 Preview Slide 53 Chapter 5 Preview Slide 54 Chapter 5 Preview Slide 55 Chapter 5 Preview
More informationPhysics 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 informationQ2. 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 informationSection 1 Changes in Motion. Chapter 4. Preview. Objectives Force Force Diagrams
Section 1 Changes in Motion Preview Objectives Force Force Diagrams Section 1 Changes in Motion Objectives Describe how force affects the motion of an object. Interpret and construct free body diagrams.
More informationChapter 4. The Laws of Motion. Dr. Armen Kocharian
Chapter 4 The Laws of Motion Dr. Armen Kocharian Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical
More informationChapter 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 reebody
More informationNewton 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 informationvariable 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
More informationPhysics Chapter 4 Newton s Laws of Motion
Physics Chapter 4 Newton s Classical Mechanics Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical
More informationGeneral 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 informationDynamics; 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 informationStudent AP Physics 1 Date. Newton s Laws B FR
Student AP Physics 1 Date Newton s Laws B FR #1 A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley
More informationForces I. Newtons Laws
Forces I Newtons Laws Kinematics The study of how objects move Dynamics The study of why objects move Newton s Laws and Forces What is force? What are they? Force A push or a pull Symbol is F Unit is N
More informationChapter 4 Forces Newton s Laws of Motion
Chapter 4 Forces Newton s Laws of Motion Forces Force A vector quantity that changes the velocity vector of an object. When you hit a baseball, the velocity of the ball changes. Can be a push or a pull
More informationPhysics for Scientists and Engineers. Chapter 5 Force and Motion
Physics for Scientists and Engineers Chapter 5 Force and Motion Spring, 2008 Ho Jung Paik Force Forces are what cause any change in the velocity of an object The net force is the vector sum of all the
More information3. What type of force is the woman applying to cart in the illustration below?
Name: Forces and Motion STUDY GUIDE Directions: Answer the following questions. 1. What is a force? a. A type of energy b. The rate at which an object performs work c. A push or a pull d. An object that
More informationDynamics: 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 informationChapter 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
More informationNewton 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 informationQ16.: A 5.0 kg block is lowered with a downward acceleration of 2.8 m/s 2 by means of a rope. The force of the block on the rope is:(35 N, down)
Old Exam Question Ch. 5 T072 Q13.Two blocks of mass m 1 = 24.0 kg and m 2, respectively, are connected by a light string that passes over a massless pulley as shown in Fig. 2. If the tension in the string
More informationForces 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
More informationSection /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. 116133 Section 5.1 A force is a push or a pull What is a force? What is a force? A force
More informationLecture 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
More informationNewton 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 informationEngage 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 freebody diagrams to represent
More informationChapter 5. The Laws of Motion
Chapter 5 The Laws of Motion Sir Isaac Newton 1642 1727 Formulated basic laws of mechanics Discovered Law of Universal Gravitation Invented form of calculus Many observations dealing with light and optics
More informationChapter 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 informationA Question about freebody diagrams
Freebody Diagrams To help us understand why something moves as it does (or why it remains at rest) it is helpful to draw a freebody diagram. The freebody diagram shows the various forces that act on
More informationLecture III. Introduction to Mechanics, Heat, and Sound /FIC 318
Introduction to Mechanics, Heat, and Sound /FIC 318 Lecture III Motion in two dimensions projectile motion The Laws of Motion Forces, Newton s first law Inertia, Newton s second law Newton s third law
More informationForce 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 informationPHYSICS. 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 informationChapter 5. The Laws of Motion
Chapter 5 The Laws of Motion The Laws of Motion The description of an object in There was no consideration of what might influence that motion. Two main factors need to be addressed to answer questions
More informationLecture 6. > Forces. > Newton's Laws. > Normal Force, Weight. (Source: Serway; Giancoli) VillacortaDLSUMBIOPHY1L Term01
Lecture 6 > Forces > Newton's Laws > Normal Force, Weight (Source: Serway; Giancoli) 1 Dynamics > Knowing the initial conditions of moving objects can predict the future motion of the said objects. > In
More informationFreeBody Diagrams: Introduction
FreeBody Diagrams: Introduction Learning Goal: To learn to draw freebody diagrams for various reallife situations. Imagine that you are given a description of a reallife situation and are asked to
More information1N 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.
More informationPHYS 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 5.0kg block is lowered with a downward
More informationDynamics: 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 informationChapter 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 informationChapter 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 informationWhy constant (or straight line) motion? Remember, if an object turns at a constant speed it is accelerating.
Newton s 1st Law Newton s 1st Law of Motion  An object in constant motion will continue in constant motion or an object at rest will stay at rest unless acted upon by an unbalanced force. Unbalanced force
More informationChapter 4 Newton s Laws
Chapter 4 Newton s Laws Isaac Newton 16421727 Some inventions and discoveries: 3 laws of motion Universal law of gravity Calculus Ideas on: Sound Light Thermodynamics Reflecting telescope In this chapter,
More informationChapters 56. Dynamics: Forces and Newton s Laws of Motion. Applications
Chapters 56 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,
More informationPSI AP Physics B Dynamics
PSI AP Physics B Dynamics MultipleChoice 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
More informationTue Sept 15. Dynamics  Newton s Laws of Motion. Forces: Identifying Forces Freebody diagram Affect on Motion
Tue Sept 15 Assignment 4 Friday Preclass Thursday Lab  Print, do prelab Closed toed shoes Exam Monday Oct 5 7:159:15 PM email me if class conflict or extended time Dynamics  Newton s Laws of Motion
More informationNEWTON S LAWS OF MOTION (EQUATION OF MOTION) (Sections )
NEWTON S LAWS OF MOTION (EQUATION OF MOTION) (Sections 13.113.3) Today s Objectives: Students will be able to: a) Write the equation of motion for an accelerating body. b) Draw the freebody and kinetic
More informationChapter 4. Forces and Mass. Classical Mechanics. Forces. Newton s First Law. Fundamental (Field) Forces. Contact and Field Forces
Chapter 4 Classical Mechanics Forces and Mass does not apply for very tiny objects (< atomic sizes) objects moving near the speed of light Newton s First Law Forces If the net force!f exerted on an object
More informationNewton 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 informationPOGIL: 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 informationChapter 4. Table of Contents. Section 1 Changes in Motion. Section 2 Newton's First Law. Section 3 Newton's Second and Third Laws
Forces and the Laws of Motion Table of Contents Section 1 Changes in Motion Section 2 Newton's First Law Section 3 Newton's Second and Third Laws Section 4 Everyday Forces Section 1 Changes in Motion Objectives
More informationForces. 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 12newton 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
More informationPH201 Chapter 5 Solutions
PH201 Chapter 5 Solutions 5.4. Set Up: For each object use coordinates where +y is upward. Each object has Call the objects 1 and 2, with and Solve: (a) The freebody diagrams for each object are shown
More informationPhysics 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 informationPHYSICS. 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 information24/06/13 Forces ( F.Robilliard) 1
R Fr F W 24/06/13 Forces ( F.Robilliard) 1 Mass: So far, in our studies of mechanics, we have considered the motion of idealised particles moving geometrically through space. Why a particular particle
More information3/10/2019. 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 informationThe 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 informationChapter 7 Newton s Third Law
Chapter 7 Newton s Third Law Chapter Goal: To use Newton s third law to understand interacting objects. Slide 72 Chapter 7 Preview Slide 73 Chapter 7 Preview Slide 74 Chapter 7 Preview Slide 76 Chapter
More informationHSC 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 informationForces and Motion in One Dimension
Nicholas J. Giordano www.cengage.com/physics/giordano Forces and Motion in One Dimension Applications of Newton s Laws We will learn how Newton s Laws apply in various situations We will begin with motion
More informationWhat 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 informationInertia and Mass. 7. Mass and velocity values for a variety of objects are listed below. Rank the objects from smallest to greatest inertia.
Inertia and Mass Read from Lesson 1 of the Newton's Laws chapter at The Physics Classroom: http://www.physicsclassroom.com/class/newtlaws/u2l1a.html http://www.physicsclassroom.com/class/newtlaws/u2l1b.html
More information1. (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 informationChapter 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 informationChapter 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 informationForces and Newton s Laws Reading Notes. Give an example of a force you have experienced continuously all your life.
Forces and Newton s Laws Reading Notes Name: Section 41: Force What is force? Give an example of a force you have experienced continuously all your life. Give an example of a situation where an object
More informationOld Exam. Question Chapter 7 072
Old Exam. Question Chapter 7 072 Q1.Fig 1 shows a simple pendulum, consisting of a ball of mass M = 0.50 kg, attached to one end of a massless string of length L = 1.5 m. The other end is fixed. If the
More informationA force is a push or a pull.
A force is a push or a pull. Contact forces arise from physical contact. Action at adistance forces do not require contact and include gravity and electrical forces. 1 Force is a vector [F]=[Newton]=[N]
More informationUNIT XX: DYNAMICS AND NEWTON S LAWS. DYNAMICS is the branch of mechanics concerned with the forces that cause motions of bodies
I. Definition of FORCE UNIT XX: DYNAMICS AND NEWTON S LAWS DYNAMICS is the branch of mechanics concerned with the forces that cause motions of bodies FORCE is a quantitative interaction between two (or
More informationNewton 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
More informationChapter 4. The Laws of Motion
Chapter 4 The Laws of Motion 1 Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does
More informationChapter 4 Dynamics: Newton s Laws of Motion
Chapter 4 Dynamics: Newton s Laws of Motion 41 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. The magnitude of
More informationCHAPTER 4 TEST REVIEW  Answer Key
AP PHYSICS Name: Period: Date: DEVIL PHYSICS BADDEST CLASS ON CAMPUS 50 Multiple Choice 45 Single Response 5 MultiResponse Free Response 3 Short Free Response 2 Long Free Response AP EXAM CHAPTER TEST
More informationChanges in Motion. Section 1. Force. Objectives. Forces can cause accelerations.
Section 1 Objectives Describe how force affects the motion of an object. Interpret and construct freebody diagrams. force an action exerted on an object that may change the object s state of rest or motion
More informationKinematics and Dynamics
AP PHYS 1 Test Review Kinematics and Dynamics Name: Other Useful Site: http://www.aplusphysics.com/ap1/ap1 supp.html 201516 AP Physics: Kinematics Study Guide The study guide will help you review all
More informationReading 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
More informationForce in Nature. <
Force in Nature www.flickr.com/photos/nrbelex/383393596/ What is a Force? http://www.youtube.com/watch?v=seblt6kd9ey&feature=youtube_gdata_player A force
More informationPractice Test for Midterm Exam
A.P. Physics Practice Test for Midterm Exam Kinematics 1. Which of the following statements are about uniformly accelerated motion? Select two answers. a) If an object s acceleration is constant then it
More informationConcept 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 7.17.4 Chapter 8 Applications of Newton s Second Law, Sections 8.18.4.1 Announcements W02D3 Reading
More informationPH 2213A Fall Force and Motion. Lecture 8. Chapter 5 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition)
PH 2213A Fall 2010 Force and Motion Lecture 8 Chapter 5 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition) 1 Chapter 5 Force and Motion In chapters 2 and 4 we have studied kinematics i.e.
More informationI. What are forces? A. Characteristics:
Chapter 5: forces I. What are forces? A. Characteristics: 1. Forces result from the interaction of objects. A FORCE is a push or a pull that one object exerts on another. 2. How are forces measured: a.
More informationThe magnitude of this force is a scalar quantity called weight.
Everyday Forces has direction The gravitational force (F g ) exerted on the ball by Earth is a vector directed toward the center of the earth. The magnitude of this force is a scalar quantity called weight.
More information2.1 Forces and FreeBody Diagrams
2.1 Forces and FreeBody Diagrams A is a push or a pull. Forces act on objects, and can result in the acceleration, compression, stretching, or twisting of objects. Forces can also act to stabilize an
More informationChapter 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
More informationTwo 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
More informationUnit 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 informationPHYSICS 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 informationConcept of Force Concept Questions
Concept of Force Concept Questions Question 1: You are pushing a wooden crate across the floor at constant speed. You decide to turn the crate on end, reducing by half the surface area in contact with
More informationForces. 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.
More information