Lecture Outline Chapter 5. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.


 Arron Hodges
 2 years ago
 Views:
Transcription
1 Lecture Outline Chapter 5 Physics, 4 th Edition James S. Walker
2 Chapter 5 Newton s Laws of Motion
3 Dynamics Force and Mass Units of Chapter 5 Newton s 1 st, 2 nd and 3 rd Laws of Motion The Vector Nature of Forces: Forces in Two Dimensions Weight Normal Forces
4 Newton s Concepts 1) m (mass): How much matter something contains 2) v (velocity): A body s speed and direction 3) a (acceleration): The change in a body s velocity per unit time 4) F (force): any external agent that causes a change in the motion of a free body
5 Force: push or pull 51 Force and Mass Force is a vector it has magnitude and direction
6 51 Force and Mass Mass is the measure of how hard it is to change an object s velocity. Mass can also be thought of as a measure of the quantity of matter in an object.
7 52 Newton s First Law of Motion If you stop pushing an object, does it stop moving? Only if there is friction! In the absence of any net external force, an object will keep moving at a constant speed in a straight line, or remain at rest. This is also known as the law of inertia.
8 52 Newton s First Law of Motion In order to change the velocity of an object magnitude or direction a net force is required. An inertial reference frame is one in which the first law is true. Accelerating reference frames are not inertial.
9 53 Newton s Second Law of Motion Observations show that the acceleration of an object is proportional to the net force exerted on it and inversely proportional to its mass: Or, more familiarly,
10 53 Newton s Second Law of Motion An object may have several forces acting on it; the acceleration is due to the net force: (51)
11 53 Newton s Second Law of Motion An object may have several forces acting on it; the acceleration is due to the net force: (51) In terms of vector components: F = ma F = ma F x x y y z = ma z
12 53 Newton s Second Law of Motion Freebody diagrams: A freebody diagram shows every force acting on an object. Sketch the forces Isolate the object of interest Choose a convenient coordinate system Resolve the forces into components Apply Newton s second law to each coordinate direction
13 53 Newton s Second Law of Motion Example of a freebody diagram:
14 53 Newton s Second Law of Motion Example 51: m boat = 753 kg, F = 80.5N. What are magnitudes and directions of accelerations in (a) and (b)
15 53 Newton s Second Law of Motion Example 51: m boat = 753 kg, F = 80.5N. What are magnitudes and directions of accelerations in (a) and (b) (a) Create free  body diagram, isolate source of interest and sketch the external forces on this body and their components. F x = ma x F L + F M + F C = ma x a x = 3(80.5N) 753kg = 0.321m/s2 (b) F x = ma x F L + F M F C = ma x a x = ( 80.5N) 753kg = 0.107m/s2
16 53 Newton s Second Law of Motion Example 52: m ball = 0.15 kg, v = 90 mi/h and Δx = 2m. Estimate the force on the ball.
17 53 Newton s Second Law of Motion Example 52: m ball = 0.15 kg, v = 90 mi/h and Δx = 2m. Estimate the force on the ball. Equation of motion along x  direction : v 2 = v a x Δx = 2aΔx a = v2 2Δx = Newton's Second Law : F x 90 mi h 2(2m) = ma x F x = (0.15kg)(400m/s 2 ) = 60N 2 = m 3600s 4m 2 = 400m/s 2
18 54 Newton s Third Law of Motion Forces always come in pairs, acting on different objects: If object 1 exerts a force on object 2, then object 2 exerts a force on object 1. These forces are called actionreaction pairs. NOTE: The action and reaction forces would appear in the freebody diagrams of different objects so they do not cancel out.
19 54 Newton s Third Law of Motion Some actionreaction pairs:
20 54 Newton s Third Law of Motion Example 53: m 1 = 150 kg, m 2 = 250 kg. The force of person in canoe 1 on canoe 2 is F = 46N. (a) acceleration of each canoe? (b) separation of canoes after t = 1.2s?
21 54 Newton s Third Law of Motion Example 53: m 1 = 150 kg, m 2 = 250 kg. The force of person in canoe 1 on canoe 2 is F = 46N. (a) acceleration of each canoe? (b) separation of canoes after t = 1.2s? Apply Newton's second law on each canoe : canoe 1: F 1x = m 1 a 1 canoe 2 : F 2x = m 2 a 2 Apply Newton's third Law : F 1 = ( 46 N)ˆ x F 2 = (46 N)ˆ x a 1 = F 1 m 1 = 46 N 150 kg = 0.31m/s2 a 2 = F 2 m 2 = Canoe 1 with the smallest mass accelerates more. 46N 250 kg = 0.18m/s2 x 1 = 1 2 a 1t 2 = 1 2 ( 0.31m/s2 )(1.2s) 2 = 0.22m x 2 = 1 2 a 2t 2 = 1 2 (0.18m/s2 )(1.2s) 2 = 0.13m Δx = x 2  x 1 = 0.35m
22 54 Newton s Third Law of Motion Contact forces: The force exerted by one box on the other is different depending on which one you push.
23 54 Newton s Third Law of Motion Apply Newton's 2nd Law on both boxes : F = (m 1 +m 2 )a a = F (m 1 +m 2 ) case1: Force on small box 2. Box 2 exerts a force F 1 on box 1 and box 1 exerts an equal and opposite force F 2 on box 2. Contact force = F 1 = F 2 Apply Newton's 2nd law on box 1 (only one external force in x direction on box 1) : Contact Force : F 1 = m 1 a = m 1 F (m 1 +m 2 )
24 54 Newton s Third Law of Motion Apply Newton's 2nd Law on both boxes : F = (m 1 +m 2 )a a = F (m 1 +m 2 ) case2 : Force on large box 1. Box 2 exerts a force F 1 on box 1 and box 1 exerts an equal and opposite force F 2 on box 2. Contact force = F 1 = F 2 Apply Newton's 2nd law on box 2 (only one external force in x direction on box 2) : Contact Force : F 2 = m 2 a = m 2 F (m 1 +m 2 ) The contact force is larger when you push on the smaller box!
25 Newton s Laws of Motion 1) An object remains at rest, or moves in a straight line at a constant speed, unless acted upon by a net outside force. 2) A body s acceleration is proportional to the net outside force acting on the object, and will be in the direction of that force. Its resistance to acceleration depends on its mass. In equation form, this is F = m a m = mass of object (kg) a = acceleration of object (m/s 2 ) F = net external force (kg m/s 2 = Newton) 3) Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
26 55 The Vector Nature of Forces: Forces in Two Dimensions The easiest way to handle forces in two dimensions is to treat each dimension separately, as we did for kinematics.
27 55 Forces in Two Dimensions Example 55: Jack and Jill. m p = 1.30 kg F 1 = 7.0 N, F 2 = 11 N, W = 12.8 N and φ=28. (a) θ =? For a x = 0 (b) a y =?
28 55 Forces in Two Dimensions Example 55: Jack and Jill. m p = 1.30 kg F 1 = 7.0 N, F 2 = 11 N, W = 12.8 N and φ=28. (a) θ =? For a x = 0 (b) a y =? Use component form of Newton's seconds law : F x = ma x F y = ma y a x = 0 θ = 48 F x = 0 F 1 sinθ +F 2 sin28 = 0 sinθ = F 2 sin28 F 1 F y = F 1 cosθ +F 2 cos28  W a y = F 1cosθ +F 2 cos28  W m p a y = (7.0 N)cos48 +(11.0 N)cos N 1.30 kg =1.2m/s 2
29 56 Weight The weight of an object on the Earth s surface is the gravitational force exerted on it by the Earth.
30 56 Weight Example 56 : Where s the fire? m f = 97 kg, h = 3.0m, t = 1.2s. What is the upward force from the pole on the fireman?
31 56 Weight Example 56 : Where s the fire? m f = 97 kg, h = 3.0m, t = 1.2s. What is the upward force from the pole on the fireman? Apply Newtons' Second Law : F y = m f a y y = h a yt 2 a y = 2h t 2 F W = m f a y F  m f g = m f a y = 2(3.0m) = 4.2m/s 2 ( 1.2s) 2 Note that the total acceleration of the fireman is negative because it is pointed in the  y direction. F = m f (g + a y ) = 97 kg(9.81m/s 2 4.2m/s 2 ) = 540N
32 Apparent weight: 56 Weight Your perception of your weight is based on the contact forces between your body and your surroundings. If your surroundings are accelerating, your apparent weight may be more or less than your actual weight.
33 56 Weight Apparent weight : The force from the floor on person. Newton's Second Law on person : W a  W = ma y W a = m(g + a y ) Case 1: At rest a y = 0 and the apparent weight is equal to our weight Case 2 : For elevator accelerating upward a y > 0 and W a > W Case 3: For elevator accelerating downward a y < 0 and W a < W
34 56 Weight Example 57 : Don t buy Salmon in an upward accelerating elevator. What is the scale weight (a) at rest (b) upward acceleration of 2.5m/s 2 (c) downward acceleration of 3.2m/s 2.
35 56 Weight Example 57 : Don t buy Salmon in an upward accelerating elevator F y = ma y F y = W a W = W a mg W a = m(g + a y )ˆ y (a) At rest a y = 0 and W a = mgˆ y = 5.0kg(9.81m/s 2 )ˆ y = 49Nˆ y (b) W a = 5.0kg(9.81m/s m/s 2 )ˆ y = 62Nˆ y (your're paying too much) (c) W a = 5.0kg(9.81m/s 23.2m/s 2 )ˆ y = 33Nˆ y
36 W a = m(g + a) For a =  g one has zero apparent weight
37 57 Normal Forces The normal force is the force exerted by a surface on an object.
38 57 Normal Forces The normal force may be equal to, greater than, or less than the weight.
39 57 Normal Forces Example 58: Ice Block F1 = 13 N, F2 = 11 N (a) What is the acceleration of the ice? (b) What is the normal force on the ice?
40 57 Normal Forces Example 58: Ice Block F 1 = 13 N, F 2 = 11 N, m = 6.0 kg (a) What is the acceleration of the ice? (b) What is the normal force on the ice? F x = ma x F y = ma y F x = F 1x +F 2x = F 1 cos60 F 2 cos30 = (13N)0.5  (11N)0.87 = 6.5N  9.5N = 3N (a) ma x =  3 N a x = 3 N 6.0kg = 0.5m/s2 a = m/s 2ˆ x F y = 0 F N W F 1y F 2y = 0 F N mg F 1 sin60 F 2 sin30 = 0 F N = mg + F 1 sin60 + F 2 sin30 = (6.0kg)(9.81m/s 2 ) +(13 N)(0.87) +(11 N)(0.5) F N = 75N F N = 75N y ˆ
41 57 Normal Forces The normal force is always perpendicular to the surface.
42 57 Normal Forces Example 59: Toboggan, m and θ known (a) What is the acceleration of the child? (b) What is the normal force on the child?
43 57 Normal Forces Example 59: Toboggan, m and θ known (a) What is the acceleration of the child? (b) What is the normal force on the child? F x = ma x F y = ma y F x = W x = ma x a x = W x m = mgsinθ m = gsinθ F y = F N Wcosθ = ma y = 0 F N = mgcosθ F N = mgcosθˆ y
44 Summary of Chapter 5 Force: a push or pull Mass: measures the difficulty in accelerating an object Newton s first law: if the net force on an object is zero, its velocity is constant Inertial frame of reference: one in which the first law holds Newton s second law: Freebody diagram: a sketch showing all the forces on an object
45 Summary of Chapter 5 Newton s third law: If object 1 exerts a force on object 2, then object 2 exerts a force on object 1. Contact forces: an actionreaction pair of forces produced by two objects in physical contact Forces are vectors Newton s laws can be applied to each component of the forces independently Weight: gravitational force exerted by the Earth on an object
46 Summary of Chapter 5 On the surface of the Earth, W = mg Apparent weight: force felt from contact with a floor or scale Normal force: force exerted perpendicular to a surface by that surface Normal force may be equal to, lesser than, or greater than the object s weight
Chapter 5 Newton s Laws of Motion
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 informationNewton s Laws of Motion
Physics Newton s Laws of Motion Newton s Laws of Motion 4.1 Objectives Explain Newton s first law of motion. Explain Newton s second law of motion. Explain Newton s third law of motion. Solve problems
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 informationChapter 4 Newton s Laws: Explaining Motion
Chapter 4 Newton s s Laws: Explaining Motion Newton s Laws of Motion The concepts of force, mass, and weight play critical roles. A Brief History! Where do our ideas and theories about motion come from?!
More informationNewton s Laws of Motion
Chapter 4 Newton s Laws of Motion PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 4 To understand the meaning
More informationChapter 4: Newton s Laws of Motion
Chapter 4: Newton s Laws of Motion Dynamics: Study of motion and its causes. orces cause changes in the motion of an object. orce and Interactions Definition ( loose ): A force is a push or pull exerted
More informationObjective: Equilibrium Applications of Newton s Laws of Motion I
Type: Single Date: Objective: Equilibrium Applications of Newton s Laws of Motion I Homework: Assignment (111) Read (4.14.5, 4.8, 4.11); Do PROB # s (46, 47, 52, 58) Ch. 4 AP Physics B Mr. Mirro Equilibrium,
More informationChapter 4 Dynamics: Newton s Laws of Motion. Copyright 2009 Pearson Education, Inc.
Chapter 4 Dynamics: Newton s Laws of Motion Force Units of Chapter 4 Newton s First Law of Motion Mass Newton s Second Law of Motion Newton s Third Law of Motion Weight the Force of Gravity; and the Normal
More informationGround Rules. PC1221 Fundamentals of Physics I. Force. Zero Net Force. Lectures 9 and 10 The Laws of Motion. Dr Tay Seng Chuan
PC1221 Fundamentals of Physics I Lectures 9 and 10 he Laws of Motion Dr ay Seng Chuan 1 Ground Rules Switch off your handphone and pager Switch off your laptop computer and keep it No talking while lecture
More informationNewton s Laws of Motion
Section 3.2 Newton s Laws of Motion Objectives Analyze relationships between forces and motion Calculate the effects of forces on objects Identify force pairs between objects New Vocabulary Newton s first
More informationChapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued Clicker Question 4.3 A mass at rest on a ramp. How does the friction between the mass and the table know how much force will EXACTLY balance the gravity
More informationGeneral Physics (PHY 2130)
General Physics (PHY 2130) Lecture 8 Forces Newton s Laws of Motion http://www.physics.wayne.edu/~apetrov/phy2130/ Classical Mechanics Describes the relationship between the motion of objects in our everyday
More informationNewton s Laws of Motion
Chapter 4 Newton s Laws of Motion PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman Lectures by James Pazun Modified by P. Lam 7_8_2016 Goals for Chapter 4
More informationForces. Lecturer: Professor Stephen T. Thornton
Forces Lecturer: Professor Stephen T. Thornton Reading Quiz: Which of Newton s laws refers to an action and a reaction acceleration? A) First law. B) Second law. C) Third law. D) This is a trick question.
More information041. Newton s First Law Newton s first law states: Sections Covered in the Text: Chapters 4 and 8 F = ( F 1 ) 2 + ( F 2 ) 2.
Force and Motion Sections Covered in the Text: Chapters 4 and 8 Thus far we have studied some attributes of motion. But the cause of the motion, namely force, we have essentially ignored. It is true that
More informationPhysics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion. Physics is about forces and how the world around us reacts to these forces.
Physics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion Physics is about forces and how the world around us reacts to these forces. Whats a force? Contact and noncontact forces. Whats a
More informationPHYSICS 149: Lecture 4
PHYSICS 149: Lecture 4 Chapter 2 2.3 Inertia and Equilibrium: Newton s First Law of Motion 2.4 Vector Addition Using Components 2.5 Newton s Third Law 1 Net Force The net force is the vector sum of all
More information5. Forces and MotionI. Force is an interaction that causes the acceleration of a body. A vector quantity.
5. Forces and MotionI 1 Force is an interaction that causes the acceleration of a body. A vector quantity. Newton's First Law: Consider a body on which no net force acts. If the body is at rest, it will
More informationChapter 4. Forces and Newton s Laws of Motion
Chapter 4 Forces and Newton s Laws of Motion 4.1 The Concepts of Force and Mass A force is a push or a pull. Contact forces arise from physical contact. Actionatadistance forces do not require contact
More informationSection Review Answers. Chapter 12
Section Review Answers Chapter 12 Section 1 1. Answers may vary. Students should say in their own words that an object at rest remains at rest and an object in motion maintains its velocity unless it experiences
More informationForce. A force is a push or a pull. Pushing on a stalled car is an example. The force of friction between your feet and the ground is yet another.
Force A force is a push or a pull. Pushing on a stalled car is an example. The force of friction between your feet and the ground is yet another. Force Weight is the force of the earth's gravity exerted
More informationLecture 9. Friction in a viscous medium Drag Force Quantified
Lecture 9 Goals Describe Friction in Air (Ch. 6) Differentiate between Newton s 1 st, 2 nd and 3 rd Laws Use Newton s 3 rd Law in problem solving Assignment: HW4, (Chap. 6 & 7, due 10/5) 1 st Exam Thurs.,
More informationNewton s Third Law. object 1 on object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 on object 1
Newton s Third Law! If two objects interact, the force exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 on object 1!! Note on notation: is
More informationNewton s Laws. Physics 1425 lecture 6. Michael Fowler, UVa.
Newton s Laws Physics 1425 lecture 6 Michael Fowler, UVa. Newton Extended Galileo s Picture of Galileo said: Motion to Include Forces Natural horizontal motion is at constant velocity unless a force acts:
More informationNewton's laws of motion
Newton's laws of motion Forces Forces as vectors Resolving vectors Explaining motion  Aristotle vs Newton Newton s first law Newton s second law Weight Calculating acceleration Newton s third law Moving
More informationv v ax v a x a v a v = = = Since F = ma, it follows that a = F/m. The mass of the arrow is unchanged, and ( )
Week 3 homework IMPORTANT NOTE ABOUT WEBASSIGN: In the WebAssign versions of these problems, various details have been changed, so that the answers will come out differently. The method to find the solution
More informationPhysics 101 Prof. Ekey. Chapter 5 Force and motion (Newton, vectors and causing commotion)
Physics 101 Prof. Ekey Chapter 5 Force and motion (Newton, vectors and causing commotion) Goal of chapter 5 is to establish a connection between force and motion This should feel like chapter 1 Questions
More informationChapter 4. Dynamics: Newton s Laws of Motion
Chapter 4 Dynamics: Newton s Laws of Motion The Concepts of Force and Mass A force is a push or a pull. Contact forces arise from physical contact. Actionatadistance forces do not require contact and
More informationDynamics Why do objects move as they do? What makes an object at rest, begin to move? What makes a body accelerate or decelerate?
Dynamics Why do objects move as they do? What makes an object at rest, begin to move? What makes a body accelerate or decelerate? What makes an object move in a circle? Force A Force is simply a push
More informationPhysics Notes Class 11 CHAPTER 5 LAWS OF MOTION
1 P a g e Inertia Physics Notes Class 11 CHAPTER 5 LAWS OF MOTION The property of an object by virtue of which it cannot change its state of rest or of uniform motion along a straight line its own, is
More informationRecap. A force is the product of an object s mass and acceleration. Forces are the reason why objects change their velocity. Newton s second law:
Recap A force is the product of an object s mass and acceleration. Forces are the reason why objects change their velocity. Newton s second law: Unit: 1 N = 1 kg m/s 2 Forces are vector quantities, since
More informationExplaining Motion:Forces
Explaining Motion:Forces Chapter Overview (Fall 2002) A. Newton s Laws of Motion B. Free Body Diagrams C. Analyzing the Forces and Resulting Motion D. Fundamental Forces E. Macroscopic Forces F. Application
More informationPhysics 11 Assignment KEY Dynamics Chapters 4 & 5
Physics Assignment KEY Dynamics Chapters 4 & 5 ote: for all dynamics problemsolving questions, draw appropriate free body diagrams and use the aforementioned problemsolving method.. Define the following
More informationNewton s Laws are empirical laws, deduced from experiment; they cannot be derived from anything more fundamental!
NEWTON S LAWS O OTION Newton s Laws are the foundation of Classical (Newtonian) echanics. They were published by Isaac Newton in 1687 along with the law of gravitation in the Principia. They have far reaching
More informationMass, energy, power and time are scalar quantities which do not have direction.
Dynamics Worksheet Answers (a) Answers: A vector quantity has direction while a scalar quantity does not have direction. Answers: (D) Velocity, weight and friction are vector quantities. Note: weight and
More informationLecture 6. Weight. Tension. Normal Force. Static Friction. Cutnell+Johnson: 4.84.12, second half of section 4.7
Lecture 6 Weight Tension Normal Force Static Friction Cutnell+Johnson: 4.84.12, second half of section 4.7 In this lecture, I m going to discuss four different kinds of forces: weight, tension, the normal
More informationDescribe the relationship between gravitational force and distance as shown in the diagram.
Name Period Chapter 2 The Laws of Motion Review Describe the relationship between gravitational force and distance as shown in the diagram. Assess the information about gravity, mass, and weight. Read
More informationWhat is a force? Identifying forces. What is the connection between force and motion? How are forces related when two objects interact?
Chapter 4: Forces 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 (field forces, contact
More informationTEACHER ANSWER KEY November 12, 2003. Phys  Vectors 11132003
Phys  Vectors 11132003 TEACHER ANSWER KEY November 12, 2003 5 1. A 1.5kilogram lab cart is accelerated uniformly from rest to a speed of 2.0 meters per second in 0.50 second. What is the magnitude
More informationFor every action, there is an and.
SPH4C1 Lesson 03 Newton s Laws NEWTON S THIRD LAW LEARNING GOALS Students will: Be able to state Newton s 3 rd Law and apply it in qualitative and quantitative terms to explain the effect of forces acting
More information2.1 Force and Motion Kinematics looks at velocity and acceleration without reference to the cause of the acceleration.
2.1 Force and Motion Kinematics looks at velocity and acceleration without reference to the cause of the acceleration. Dynamics looks at the cause of acceleration: an unbalanced force. Isaac Newton was
More informationChapter 4 Dynamics: Newton s Laws of Motion
Chapter 4 Dynamics: Newton s Laws of Motion Units of Chapter 4 Force Newton s First Law of Motion Mass Newton s Second Law of Motion Newton s Third Law of Motion Weight the Force of Gravity; and the Normal
More informationphysics 111N forces & Newton s laws of motion
physics 111N forces & Newton s laws of motion forces (examples) a push is a force a pull is a force gravity exerts a force between all massive objects (without contact) (the force of attraction from the
More informationPhysics: Principles and Applications, 6e Giancoli Chapter 4 Dynamics: Newton's Laws of Motion
Physics: Principles and Applications, 6e Giancoli Chapter 4 Dynamics: Newton's Laws of Motion Conceptual Questions 1) Which of Newton's laws best explains why motorists should buckleup? A) the first law
More informationChapter 18 Static Equilibrium
Chapter 8 Static Equilibrium 8. Introduction Static Equilibrium... 8. Lever Law... Example 8. Lever Law... 4 8.3 Generalized Lever Law... 5 8.4 Worked Examples... 7 Example 8. Suspended Rod... 7 Example
More informationIntroduction to Newton's Laws of Motion 16421726
Introduction to Newton's Laws of Motion 16421726 Outlook 1.The First Law on inertia states that every object will remain in a state of rest or uniform motion in a straight line unless acted upon by an
More informationPhysics 101. Chapter 5: Newton s Third Law
Physics 101 Today Chapter 5: Newton s Third Law First, let s clarify notion of a force: Previously defined force as a push or pull. Better to think of force as an interaction between two objects. You can
More informationNEWTON S LAWS OF MOTION
NEWTON S LAWS OF MOTION Background: Aristotle believed that the natural state of motion for objects on the earth was one of rest. In other words, objects needed a force to be kept in motion. Galileo studied
More informationNewton s Law of Motion
chapter 5 Newton s Law of Motion Static system 1. Hanging two identical masses Context in the textbook: Section 5.3, combination of forces, Example 4. Vertical motion without friction 2. Elevator: Decelerating
More informationPhysics I Honors: Chapter 4 Practice Exam
Physics I Honors: Chapter 4 Practice Exam Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following statements does not describe
More informationDescribed by Isaac Newton
Described by Isaac Newton States observed relationships between motion and forces 3 statements cover aspects of motion for single objects and for objects interacting with another object An object at rest
More informationChapter 5 Newton s Laws of Motion
Chapter 5 Newton s Laws of Motion Sir Isaac Newton (1642 1727) Developed a picture of the universe as a subtle, elaborate clockwork slowly unwinding according to welldefined rules. The book Philosophiae
More informationFriction and Newton s 3rd law
Lecture 4 Friction and Newton s 3rd law Prereading: KJF 4.8 Frictional Forces Friction is a force exerted by a surface. The frictional force is always parallel to the surface Due to roughness of both
More informationConceptual Physics 11 th Edition. Forces and Interactions. Newton s Third Law of Motion. This lecture will help you understand:
This lecture will help you understand: Conceptual Physics 11 th Edition Chapter 5: NEWTON S THIRD LAW OF MOTION Forces and Interactions Summary of Newton s Laws Vectors Forces and Interactions Interaction
More informationConceptual Physics 11 th Edition
Conceptual Physics 11 th Edition Chapter 5: NEWTON S THIRD LAW OF MOTION This lecture will help you understand: Forces and Interactions Newton s Third Law of Motion Summary of Newton s Laws Vectors Forces
More informationSTATICS. Introduction VECTOR MECHANICS FOR ENGINEERS: Eighth Edition CHAPTER. Ferdinand P. Beer E. Russell Johnston, Jr.
Eighth E CHAPTER VECTOR MECHANICS FOR ENGINEERS: STATICS Ferdinand P. Beer E. Russell Johnston, Jr. Introduction Lecture Notes: J. Walt Oler Texas Tech University Contents What is Mechanics? Fundamental
More informationW02D22 Table Problem Newton s Laws of Motion: Solution
ASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01 W0D Table Problem Newton s Laws of otion: Solution Consider two blocks that are resting one on top of the other. The lower block
More informationChapter 4A. Translational Equilibrium. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University
Chapter 4. Translational Equilibrium PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University 2007 MOUNTIN CLIMER exerts action forces on crevices and ledges,
More informationUNIT 2D. Laws of Motion
Name: Regents Physics Date: Mr. Morgante UNIT 2D Laws of Motion Laws of Motion Science of Describing Motion is Kinematics. Dynamics the study of forces that act on bodies in motion. First Law of Motion
More information1206EL  Concepts in Physics. Friday, September 18th
1206EL  Concepts in Physics Friday, September 18th Notes There is a WebCT course for students on September 21st More information on library webpage Newton s second law Newton's first law of motion predicts
More informationChapter 3: Force and Motion
Force and Motion Cause and Effect Chapter 3 Chapter 3: Force and Motion Homework: All questions on the Multiple Choice and the oddnumbered questions on Exercises sections at the end of the chapter. In
More informationChapter 6. Work and Energy
Chapter 6 Work and Energy The concept of forces acting on a mass (one object) is intimately related to the concept of ENERGY production or storage. A mass accelerated to a nonzero speed carries energy
More informationNewton s Third Law. Newton s Third Law of Motion. ActionReaction Pairs
Section 4 Newton s Third Law Reading Preview Key Concepts What is Newton s third law of motion? How can you determine the momentum of an object? What is the law of conservation of momentum? Key Terms momentum
More informationExample (1): Motion of a block on a frictionless incline plane
Firm knowledge of vector analysis and kinematics is essential to describe the dynamics of physical systems chosen for analysis through ewton s second law. Following problem solving strategy will allow
More informationNewton s Laws PreTest
Newton s Laws PreTest 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)
More informationForces: Equilibrium Examples
Physics 101: Lecture 02 Forces: Equilibrium Examples oday s lecture will cover extbook Sections 2.12.7 Phys 101 URL: http://courses.physics.illinois.edu/phys101/ Read the course web page! Physics 101:
More informationNewton s Laws of Motion
Newton s Laws of Motion Newton s Laws and the Mousetrap Racecar Simple version of Newton s three laws of motion 1 st Law: objects at rest stay at rest, objects in motion stay in motion 2 nd Law: force
More information2.2 NEWTON S LAWS OF MOTION
2.2 NEWTON S LAWS OF MOTION Sir Isaac Newton (16421727) made a systematic study of motion and extended the ideas of Galileo (15641642). He summed up Galileo s observation in his three laws of motion
More informationLecture 7 Force and Motion. Practice with Freebody Diagrams and Newton s Laws
Lecture 7 Force and Motion Practice with Freebody Diagrams and Newton s Laws oday we ll just work through as many examples as we can utilizing Newton s Laws and freebody diagrams. Example 1: An eleator
More informationGravitational Potential Energy
Gravitational Potential Energy Consider a ball falling from a height of y 0 =h to the floor at height y=0. A net force of gravity has been acting on the ball as it drops. So the total work done on the
More informationSOLID MECHANICS DYNAMICS TUTORIAL INERTIA FORCES IN MECHANISMS
SOLID MECHANICS DYNAMICS TUTORIAL INERTIA FORCES IN MECHANISMS This work covers elements of the syllabus for the Engineering Council Exam D225 Dynamics of Mechanical Systems C103 Engineering Science. This
More informationCHAPTER 6 WORK AND ENERGY
CHAPTER 6 WORK AND ENERGY CONCEPTUAL QUESTIONS. REASONING AND SOLUTION The work done by F in moving the box through a displacement s is W = ( F cos 0 ) s= Fs. The work done by F is W = ( F cos θ). s From
More informationForces. Definition Friction Falling Objects Projectiles Newton s Laws of Motion Momentum Universal Forces Fluid Pressure Hydraulics Buoyancy
Forces Definition Friction Falling Objects Projectiles Newton s Laws of Motion Momentum Universal Forces Fluid Pressure Hydraulics Buoyancy Definition of Force Force = a push or pull that causes a change
More informationVELOCITY, ACCELERATION, FORCE
VELOCITY, ACCELERATION, FORCE velocity Velocity v is a vector, with units of meters per second ( m s ). Velocity indicates the rate of change of the object s position ( r ); i.e., velocity tells you how
More informationChapter 12  Forces and Motion
Chapter 12  Forces and Motion A. What is a force? 1. It is a push or pull. 2. Force can cause resting objects to move. 3. Force can cause acceleration by changing the object s speed or direction. 4. Newtons
More informationQUESTIONS : CHAPTER5: LAWS OF MOTION
QUESTIONS : CHAPTER5: LAWS OF MOTION 1. What is Aristotle s fallacy? 2. State Aristotlean law of motion 3. Why uniformly moving body comes to rest? 4. What is uniform motion? 5. Who discovered Aristotlean
More informationWeight The weight of an object is defined as the gravitational force acting on the object. Unit: Newton (N)
Gravitational Field A gravitational field as a region in which an object experiences a force due to gravitational attraction Gravitational Field Strength The gravitational field strength at a point in
More informationA Review of Vector Addition
Motion and Forces in Two Dimensions Sec. 7.1 Forces in Two Dimensions 1. A Review of Vector Addition. Forces on an Inclined Plane 3. How to find an Equilibrant Vector 4. Projectile Motion Objectives Determine
More informationCOURSE CONTENT. Introduction. Definition of a Force Effect of Forces Measurement of forces. Newton s Laws of Motion
CHAPTER 13  FORCES COURSE CONTENT Introduction Newton s Laws of Motion Definition of a Force Effect of Forces Measurement of forces Examples of Forces A force is just a push or pull. Examples: an object
More informationAP Physics Applying Forces
AP Physics Applying Forces This section of your text will be very tedious, very tedious indeed. (The Physics Kahuna is just as sorry as he can be.) It s mostly just a bunch of complicated problems and
More informationMOTION AND FORCE: DYNAMICS
MOTION AND FORCE: DYNAMICS We ve been dealing with the fact that objects move. Velocity, acceleration, projectile motion, etc. WHY do they move? Forces act upon them, that s why! The connection between
More informationPhysics 11 Chapter 4 HW Solutions
Physics 11 Chapter 4 HW Solutions Chapter 4 Conceptual Question: 5, 8, 10, 18 Problems: 3, 3, 35, 48, 50, 54, 61, 65, 66, 68 Q4.5. Reason: No. If you know all of the forces than you know the direction
More informationPS5.1 Explain the relationship among distance, time, direction, and the velocity of an object.
PS5.1 Explain the relationship among distance, time, direction, and the velocity of an object. It is essential for students to Understand Distance and Displacement: Distance is a measure of how far an
More informationF13HPhysQ5 Practice
Name: Class: Date: ID: A F13HPhysQ5 Practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A vector is a quantity that has a. time and direction.
More informationUnification of the laws of the Earth and the Universe Why do planets appear to wander slowly across the sky?
October 19, 2015 Unification of the laws of the Earth and the Universe Why do planets appear to wander slowly across the sky? Key Words Newton s Laws of motion, and Newton s law of universal gravitation:
More informationD) A block pulled with a constant force will have a constant acceleration in the same direction as the force.
Phsics 100A Homework 4 Chapter 5 Newton s First Law A)If a car is moving to the left with constant velocit then the net force applied to the car is zero. B) An object cannot remain at rest unless the net
More informationNewton s Laws of Motion. I. Law of Inertia II. F=ma III. ActionReaction
Newton s Laws of Motion I. Law of Inertia II. F=ma III. ActionReaction While most people know what Newton's laws say, many people do not know what they mean (or simply do not believe what they mean).
More informationUnsaved Test, Version: 1 1
Name: Select the term that best completes the statement. A. force B. net force C. unbalanced force D. Newton's first law E. motion F. inertia 1. is the change of position over time. Date: 2. The overall
More informationMore of Newton s Laws
More of Newton s Laws Announcements: Tutorial Assignments due tomorrow. Pages 1921, 23, 24 (not 22,25) Note Long Answer HW due this week. CAPA due on Friday. Have added together the clicker scores so
More informationC B A T 3 T 2 T 1. 1. What is the magnitude of the force T 1? A) 37.5 N B) 75.0 N C) 113 N D) 157 N E) 192 N
Three boxes are connected by massless strings and are resting on a frictionless table. Each box has a mass of 15 kg, and the tension T 1 in the right string is accelerating the boxes to the right at a
More informationVectors and the Inclined Plane
Vectors and the Inclined Plane Introduction: This experiment is designed to familiarize you with the concept of force as a vector quantity. The inclined plane will be used to demonstrate how one force
More informationNewton's First Law. Newton s Laws. Page 1 of 6
Newton's First Law Newton s Laws In previous units, the variety of ways by which motion can be described (words, graphs, diagrams, numbers, etc.) was discussed. In this unit (Newton's Laws of Motion),
More informationF = ma. F = mg. Forces. Forces. Free Body Diagrams. Find the unknown forces!! Ex. 1 Ex N. Newton s First Law. Newton s Second Law
Forces Free Body Diagrams Push or pull on an object Causes acceleration Measured in Newtons N = Kg m s Shows all forces as vectors acting on an object Vectors always point away from object Used to help
More informationNewton s Laws of Motion. Presented by:  Rakhi Gupta(166) Tamanpreet Kaur(211)
Newton s Laws of Motion Presented by:  Rakhi Gupta(166) Tamanpreet Kaur(211) Contents of the Presentation Newton s First law of Motion Balance and Unbalanced Force Newton s Second law of Motion Free Falling
More informationMotion Lesson 1: Review of Basic Motion
Motion in one and two dimensions: Lesson 1 Seminotes Motion Lesson 1: Review of Basic Motion Note. For these semi notes we will use the bold italics convention to represent vectors. Complete the following
More informationReview Vocabulary force: a push or a pull. Vocabulary Newton s third law of motion
Standard 7.3.17: Investigate that an unbalanced force, acting on an object, changes its speed or path of motion or both, and know that if the force always acts toward the same center as the object moves,
More informationLecture 07: Work and Kinetic Energy. Physics 2210 Fall Semester 2014
Lecture 07: Work and Kinetic Energy Physics 2210 Fall Semester 2014 Announcements Schedule next few weeks: 9/08 Unit 3 9/10 Unit 4 9/15 Unit 5 (guest lecturer) 9/17 Unit 6 (guest lecturer) 9/22 Unit 7,
More informationAt the skate park on the ramp
At the skate park on the ramp 1 On the ramp When a cart rolls down a ramp, it begins at rest, but starts moving downward upon release covers more distance each second When a cart rolls up a ramp, it rises
More informationConcept Review. Physics 1
Concept Review Physics 1 Speed and Velocity Speed is a measure of how much distance is covered divided by the time it takes. Sometimes it is referred to as the rate of motion. Common units for speed or
More informationMeasurements of Speed. Speed. v = d t. PowerPoint Lectures to accompany Physical Science, 6e
PowerPoint Lectures to accompany Physical Science, 6e Chapter 2 Motion Homework: All the multiple choice questions in Applying the Concepts and Group A questions in Parallel Exercises. Motion is.. A change
More information