Chapter 5: Energy. Energy is one of the most important concepts in the world of science. Common forms of Energy
|
|
- Pierce Camron Carter
- 5 years ago
- Views:
Transcription
1 Chapter 5: Energy Energy is one of the most important concepts in the world of science. Common forms of Energy Mechanical Chemical Thermal Electromagnetic Nuclear One form of energy can be converted to another form, but the total amount of energy in the universe never changes. Work W ( F cosθ ) Δx F is the magnitude of the force Δ x is the magnitude of the object s displacement θ is r the angle between r F and Δx Work provides a link between force and energy.
2 Work This gives no information about the time it took for the displacement to occur the velocity or acceleration of the object Work is a scalar quantity, can be positive, negtive, or zero. SI unit of Work Newton meter = Joule N m = J J = kg m / s v f v m v i f What changes when Work is done? A non-zero net force results in acceleration of an object, thus change of velocity. But, change of what quantity can be characterized by Work? FΔx W = a Δx = = m m mv = W i
3 Kinetic Energy The kinetic energy KE of an object with mass m and speed v is given by KE = mv The Work-Kinetic Energy Theorem W= KE f KE i = ΔKE = m v f m vi Example: Downhill Skiing A 58-kg skier is coasting down a 5 o slope. A kinetic frictional force of magnitude f k = 70N opposes her motion. Near the top of the slope, the skier s speed is v i = 3.6 m/s. Ignore air resistance, determine the speed v f at a point that is displaced 57m downhill. Work done by gravitational force is W G = 58 * 9.8 * 57 * sin5 o =.37x0 4 J Work done by frictional force is W F = - 70 N * 57 m = x 0 3 J Total work = W G + W F = 9.7x 0 3 J = ΔKE = 0.5*58*v f - 0.5*58*3.6 Therefore, v f = 9 m/s
4 A force is a conservative force when the work it does on an object moving between two points is independent of the path between the two points. Conservative Forces Examples of Conservative Forces: Gravitational force Elastic spring force Electrostatic force Gravitational Potential Energy W gravity = mg (y i y f ) The gravitational potential energy PE is the energy that an object of mass m has by virtue of its position relative to the surface of the earth. That position is measured by the height y of the object relative to an arbitrary zero level: PE = mgy W g = PE i -PE f SI Unit of PE is joule (J). The choice for the location of zero potential energy is arbitrary, because only change in potential energy has physical consequence.
5 Mechanical Energy ΔKE = W = W nc + W g = W nc + (PE i PE f ) KE f KE i = ΔKE W = ( KE KE ) + ( PE PE ) nc f i f i E = KE + PE W nc = E f E i When there s no non-conservative force, W nc =0, and E f = E i Examples of Conserv. of Mech. Energy Three balls thrown with same initial speed. Rank the speeds of the balls as they reach the ground. Projectile Motion A motorcyclist is trying to leap across the canyon by driving horizontally off the cliff at a speed of 38.0 m/s. Ignoring air resistance, find the speed with which the cycle strikes the ground on the other side.
6 Work done by a varying force W = ( Fcosθ ) Δs + ( Fcosθ ) Δs + Work done by a varying force is the area under the curve of F vs x. Potential Energy POTENTIAL ENERGY at point A is the negative of the work done by a conservative force from point O to point A. is the work that need to be done against a conservative force to bring an object at rest from point O to point A. is the energy stored in a conservative force field is the potential (ability, tendency,..) of a conservative force field to do work
7 Hooke s Law: Springs and Hooke s Law The restoring force of an ideal spring is F = - k x where k is the spring constant and x is the displacement of the spring from its unstrained length. The minus sign indicates that the restoring force always points in a direction opposite to the displacement of the spring. Unit of k: N/m Elastic spring force is a conservative force. Potential Energy of Compressed (of Stretched) Spring Spring potential energy is the work required to compress or stretch a spring from its equilibrium position to a final position x. F = k x The work is the area under that curve: W = kx / Therefore, the elastic potential energy of a stretched or compressed spring is PE elastic = kx / Note: To consider the potential energy of the spring, we CANNOT arbitrarily define where x=0 is.
8 Total Mechanical Energy Involving Springs KE f KE i = W nc + W g + W s = W nc (PE gf PE gi ) - (PE sf PE si ) W nc = (KE f KE i) ) + (PE gf PE gi ) + (PE sf PE si ) = (KE+PE g +PE s ) f -(KE+PE g +PE s ) i Total mechanical energy: E Total = KE + PE g + PE s = mv + mgy + If W nc = 0, E total is conserved. kx Example: Mechanical Energy Involving Springs Total mechanical energy E Total = mv + mgy + kx The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in. If the spring is compressed a distance of 0.0 m and the gun fired vertically as shown, the gun can launch a 0.0-g projectile from rest to a maximum height of 0.0 m above the starting point of the projectile. Neglecting all resistive forces, determine (a) the spring constant and (b) the speed of the projectile as it moves through the equilibrium position of the spring (where x = 0).
9 Power Definition of Average Power Average power P is the average rate at which work W is done, and it is obtained by dividing W by the time t required to perform the work P = Work Time = W Δt If the force is constant and points in the same direction as the displacement, the average power can be written as W F Δx P = = = Δt Δt SI Unit of Power: joule/s = watt (W) F v ft lb hp = 550 = 746 W s Example Problems: Chap. 5 Two blocks, A and B (with mass 50 kg and 00 kg, respectively), are connected by a string. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is μ k = 0.5. Determine the change in the kinetic energy of block A as it moves from C to D, a distance of 0 m up the incline if the system starts from rest. C D A child slides without friction from a height h along a curved water slide. She is launched from a height h/5 into the pool. Determine her maximum airborne height y in terms of h and θ.
10 Review of Chapter 5 Work W = (F cosθ)s Kinetic energy = mv / Work done by net external forces = ΔKE Conservative and non-conservative forces Gravitational potential energy = mgy Hooke s law and springs F = -kx Elastic potential energy / kx Total mechanical energy = KE + PE Principle of conservation of mechanical energy Average power Principle of conservation of energy
Chapter 5. Work and Energy. continued
Chapter 5 Work and Energy continued 5.2 Work on a Spring & Work by a Spring HOOKE S LAW Force Required to Distort an Ideal Spring The force applied to an ideal spring is proportional to the displacement
More informationChapter 5. Work and Energy. continued
Chapter 5 Work and Energy continued 5.2 Work on a Spring & Work by a Spring Work done by applied force stretching (or compressing) a spring. Force is changing while stretching so use the average force.
More informationPower: Sources of Energy
Chapter 5 Energy Power: Sources of Energy Tidal Power SF Bay Tidal Power Project Main Ideas (Encyclopedia of Physics) Energy is an abstract quantity that an object is said to possess. It is not something
More informationMechanics and Heat. Chapter 5: Work and Energy. Dr. Rashid Hamdan
Mechanics and Heat Chapter 5: Work and Energy Dr. Rashid Hamdan 5.1 Work Done by a Constant Force Work Done by a Constant Force A force is said to do work if, when acting on a body, there is a displacement
More informationChapters 10 & 11: Energy
Chapters 10 & 11: Energy Power: Sources of Energy Tidal Power SF Bay Tidal Power Project Main Ideas (Encyclopedia of Physics) Energy is an abstract quantity that an object is said to possess. It is not
More informationENERGY. Conservative Forces Non-Conservative Forces Conservation of Mechanical Energy Power
ENERGY Conservative Forces Non-Conservative Forces Conservation of Mechanical Energy Power Conservative Forces A force is conservative if the work it does on an object moving between two points is independent
More informationChapter 6 Energy and Oscillations
Chapter 6 Energy and Oscillations Conservation of Energy In this chapter we will discuss one of the most important and fundamental principles in the universe. Energy is conserved. This means that in any
More informationLectures Chapter 6 (Cutnell & Johnson, Physics 7 th edition)
PH 201-4A spring 2007 Work and Energy Lectures 16-17 Chapter 6 (Cutnell & Johnson, Physics 7 th edition) 1 Work and Energy: Work done by a constant force Constant pushing force F pointing in the same direction
More informationWork Done by a Constant Force
Work and Energy Work Done by a Constant Force In physics, work is described by what is accomplished when a force acts on an object, and the object moves through a distance. The work done by a constant
More informationP8.14. m 1 > m 2. m 1 gh = 1 ( 2 m 1 + m 2 )v 2 + m 2 gh. 2( m 1. v = m 1 + m 2. 2 m 2v 2 Δh determined from. m 2 g Δh = 1 2 m 2v 2.
. Two objects are connected by a light string passing over a light frictionless pulley as in Figure P8.3. The object of mass m is released from rest at height h. Using the principle of conservation of
More informationChapters 10 & 11: Energy
Chapters 10 & 11: Energy Power: Sources of Energy Tidal Power SF Bay Tidal Power Project Main Ideas (Encyclopedia of Physics) Energy is an abstract quantity that an object is said to possess. It is not
More informationChapter 8. Potential Energy and Energy Conservation
Chapter 8. Potential Energy and Energy Conservation Introduction In Ch 7 Work- Energy theorem. We learnt that total work done on an object translates to change in it s Kinetic Energy In Ch 8 we will consider
More informationLecture 9. > Potential Energy. > Conservation of Energy. > Power. (Source: Serway; Giancoli) Villacorta--DLSUM-BIOPHY1-L Term01
Lecture 9 > Potential Energy > Conservation of Energy > Power (Source: Serway; Giancoli) 1 Conservative & Nonconservative Forces > The various ways work and energy appear in some processes lead to two
More informationPHYSICS 231 INTRODUCTORY PHYSICS I
PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 6 Last Lecture: Gravity Normal forces Strings, ropes and Pulleys Today: Friction Work and Kinetic Energy Potential Energy Conservation of Energy Frictional Forces
More informationLecture 3. > Potential Energy. > Conservation of Energy. > Power. (Source: Serway; Giancoli) Villacorta--DLSUM-SCIENVP-L Term01
Lecture 3 > Potential Energy > Conservation of Energy > Power (Source: Serway; Giancoli) 1 Conservative & Nonconservative Forces > Conservative forces allow objects to lose energy through work and gain
More informationEnergy present in a variety of forms. Energy can be transformed form one form to another Energy is conserved (isolated system) ENERGY
ENERGY Energy present in a variety of forms Mechanical energy Chemical energy Nuclear energy Electromagnetic energy Energy can be transformed form one form to another Energy is conserved (isolated system)
More informationConservative vs. Non-conservative forces Gravitational Potential Energy. Conservation of Mechanical energy
Next topic Conservative vs. Non-conservative forces Gravitational Potential Energy Mechanical Energy Conservation of Mechanical energy Work done by non-conservative forces and changes in mechanical energy
More informationThe content contained in all sections of chapter 6 of the textbook is included on the AP Physics B exam.
WORK AND ENERGY PREVIEW Work is the scalar product of the force acting on an object and the displacement through which it acts. When work is done on or by a system, the energy of that system is always
More informationConservation of Energy and Momentum
Conservation of Energy and Momentum Three criteria for Work There must be a force. There must be a displacement, d. The force must have a component parallel to the displacement. Work, W = F x d, W = Fd
More informationPower: Sources of Energy
Chapter 7: Energy Power: Sources of Energy Tidal Power SF Bay Tidal Power Project Main Ideas (Encyclopedia of Physics) Energy is an abstract quantity that an object is said to possess. It is not something
More informationChapter 6. Work and Energy
Chapter 6 Work and Energy The Ideal Spring HOOKE S LAW: RESTORING FORCE OF AN IDEAL SPRING The restoring orce on an ideal spring is F x = k x SI unit or k: N/m The Ideal Spring Example: A Tire Pressure
More informationToday: Work, Kinetic Energy, Potential Energy. No Recitation Quiz this week
Today: Work, Kinetic Energy, Potential Energy HW #4 due Thursday, 11:59 p.m. pm No Recitation Quiz this week 1 What is Energy? Mechanical Electromagnetic PHY 11 PHY 13 Chemical CHE 105 Nuclear PHY 555
More informationLesson 5. Luis Anchordoqui. Physics 168. Tuesday, September 26, 17
Lesson 5 Physics 168 1 C. B.-Champagne Luis Anchordoqui 2 2 Work Done by a Constant Force distance moved times component of force in direction of displacement W = Fd cos 3 Work Done by a Constant Force
More information= 1 2 kx2 dw =! F! d! r = Fdr cosθ. T.E. initial. = T.E. Final. = P.E. final. + K.E. initial. + P.E. initial. K.E. initial =
Practice Template K.E. = 1 2 mv2 P.E. height = mgh P.E. spring = 1 2 kx2 dw =! F! d! r = Fdr cosθ Energy Conservation T.E. initial = T.E. Final (1) Isolated system P.E. initial (2) Energy added E added
More informationWork Up an Incline. Work = Force x Distance. Push up: 1500J. What is the PE at the top? mg = 500N. An incline is a simple machine!
Quick Question Work Up an Incline The block o ice weighs 500 Newtons. How much work does it take to push it up the incline compared to liting it straight up? Ignore riction. Work Up an Incline Work = Force
More informationIf you have a conflict, you should have already requested and received permission from Prof. Shapiro to take the make-up exam.
Reminder: Exam this Sunday Nov. 9. Chapters 5. 5.4, 3.4,.0, 6, 7. Time: 6:0 7:30 PM Look up locations online. Bring calculator and formula sheet. If you have a conflict, you should have already requested
More informationChapter 6 Work, Energy, and Power. Copyright 2010 Pearson Education, Inc.
Chapter 6 Work, Energy, and Power What Is Physics All About? Matter Energy Force Work Done by a Constant Force The definition of work, when the force is parallel to the displacement: W = Fs SI unit: newton-meter
More informationChapter 07: Kinetic Energy and Work
Chapter 07: Kinetic Energy and Work Conservation of Energy is one of Nature s fundamental laws that is not violated. Energy can take on different forms in a given system. This chapter we will discuss work
More informationPotential Energy and Conservation of Energy Chap. 7 & 8
Level : AP Physics Potential Energy and Conservation of Energy Chap. 7 & 8 Potential Energy of a System see p.191 in the textbook - Potential energy is the energy associated with the arrangement of a system
More informationPhysics. Chapter 7 Energy
Physics Chapter 7 Energy Work How long does a force act? Last week, we meant time as in impulse (Ft) This week, we will take how long to mean distance Force x distance (Fd) is what we call WORK W = Fd
More informationKinematics 1D Kinematics 2D Dynamics Work and Energy
Kinematics 1D Kinematics 2D Dynamics Work and Energy Kinematics 1 Dimension Kinematics 1 Dimension All about motion problems Frame of Reference orientation of an object s motion Used to anchor coordinate
More informationChapters 10 & 11: Energy
Chapters 10 & 11: Energy Power: Sources of Energy Tidal Power SF Bay Tidal Power Project Main Ideas (Encyclopedia of Physics) Energy is an abstract quantity that an object is said to possess. It is not
More informationCHAPTER 6 WORK AND ENERGY
CHAPTER 6 WORK AND ENERGY ANSWERS TO FOCUS ON CONCEPTS QUESTIONS (e) When the force is perpendicular to the displacement, as in C, there is no work When the force points in the same direction as the displacement,
More informationHealy/DiMurro. Vibrations 2016
Name Vibrations 2016 Healy/DiMurro 1. In the diagram below, an ideal pendulum released from point A swings freely through point B. 4. As the pendulum swings freely from A to B as shown in the diagram to
More informationSometimes (like on AP test) you will see the equation like this:
Work, Energy & Momentum Notes Chapter 5 & 6 The two types of energy we will be working with in this unit are: (K in book KE): Energy associated with of an object. (U in book PE): Energy associated with
More informationPH211 Chapter 10 Solutions
PH Chapter 0 Solutions 0.. Model: We will use the particle model for the bullet (B) and the running student (S). Solve: For the bullet, K B = m v = B B (0.00 kg)(500 m/s) = 50 J For the running student,
More informationUnits are important anyway
Ch. 1 Units -- SI System (length m, Mass Kg and Time s). Dimensions -- First check of Mathematical relation. Trigonometry -- Cosine, Sine and Tangent functions. -- Pythagorean Theorem Scalar and Vector
More informationPotential Energy. Serway 7.6, 7.7;
Potential Energy Conservative and non-conservative forces Gravitational and elastic potential energy Mechanical Energy Serway 7.6, 7.7; 8.1 8.2 Practice problems: Serway chapter 7, problems 41, 43 chapter
More informationThis chapter covers all kinds of problems having to do with work in physics terms. Work
Chapter 7 Working the Physics Way In This Chapter Understanding work Working with net force Calculating kinetic energy Handling potential energy Relating kinetic energy to work This chapter covers all
More informationWORK, POWER & ENERGY
WORK, POWER & ENERGY Work An applied force acting over a displacement. The force being applied must be parallel to the displacement for work to be occurring. Work Force displacement Units: Newton meter
More informationS15--AP Q1 Work and Energy PRACTICE
Name: Class: Date: S15--AP Q1 Work and Energy PRACTICE Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Rupel pushes a box 5.00 m by applying a 25.0-N horizontal
More informationSlide. King Saud University College of Science Physics & Astronomy Dept. PHYS 103 (GENERAL PHYSICS) CHAPTER 8: POTENTIAL ENERGY LECTURE NO.
Slide King Saud University College of Science Physics & Astronomy Dept. PHYS 103 (GENERAL PHYSICS) CHAPTER 8: POTENTIAL ENERGY LECTURE NO. 11 THIS PRESENTATION HAS EEN PREPARED Y: DR. NASSR S. ALZAYED
More informationPhys101 Second Major-152 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 2016 Page: 1
Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 1 Q1. Figure 1 shows two masses; m 1 = 4.0 and m = 6.0 which are connected by a massless rope passing over a
More informationAP Physics C - Mechanics
Slide 1 / 84 Slide 2 / 84 P Physics C - Mechanics Energy Problem Solving Techniques 2015-12-03 www.njctl.org Table of Contents Slide 3 / 84 Introduction Gravitational Potential Energy Problem Solving GPE,
More informationLecture 10 Mechanical Energy Conservation; Power
Potential energy Basic energy Lecture 10 Mechanical Energy Conservation; Power ACT: Zero net work The system of pulleys shown below is used to lift a bag of mass M at constant speed a distance h from the
More informationChapter 7 Work and Kinetic Energy. Copyright 2010 Pearson Education, Inc.
Chapter 7 Work and Kinetic Energy Units of Chapter 7 Work Done by a Constant Force Kinetic Energy and the Work-Energy Theorem Work Done by a Variable Force Power 7-1 Work Done by a Constant Force The definition
More informationPhysics 1A, Summer 2011, Summer Session 1 Quiz 3, Version A 1
Physics 1A, Summer 2011, Summer Session 1 Quiz 3, Version A 1 Closed book and closed notes. No work needs to be shown. 1. Three rocks are thrown with identical speeds from the top of the same building.
More informationReview. 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
More informationEnergy Problem Solving Techniques.
1 Energy Problem Solving Techniques www.njctl.org 2 Table of Contents Introduction Gravitational Potential Energy Problem Solving GPE, KE and EPE Problem Solving Conservation of Energy Problem Solving
More informationIn vertical circular motion the gravitational force must also be considered.
Vertical Circular Motion In vertical circular motion the gravitational force must also be considered. An example of vertical circular motion is the vertical loop-the-loop motorcycle stunt. Normally, the
More informationChapter 6: Work and Kinetic Energy
Chapter 6: Work and Kinetic Energy Suppose you want to find the final velocity of an object being acted on by a variable force. Newton s 2 nd law gives the differential equation (for 1D motion) dv dt =
More informationPhysics 2414 Group Exercise 8. Conservation of Energy
Physics 244 Group Exercise 8 Name : OUID : Name 2: OUID 2: Name 3: OUID 3: Name 4: OUID 4: Section Number: Solutions Solutions Conservation of Energy A mass m moves from point i to point f under the action
More informationChapter 8. Conservation of Energy
Chapter 8 Conservation of Energy Energy Review Kinetic Energy Associated with movement of members of a system Potential Energy Determined by the configuration of the system Gravitational and Elastic Potential
More informationWork and kinetic energy. If a net force is applied on an object, the object may
Work and kinetic energy If a net force is applied on an object, the object may CHAPTER 6 WORK AND ENERGY experience a change in position, i.e., a displacement. When a net force is applied over a distance,
More informationChapter 6 Work and Energy
Chapter 6 Work and Energy Midterm exams will be available next Thursday. Assignment 6 Textbook (Giancoli, 6 th edition), Chapter 6: Due on Thursday, November 5 1. On page 162 of Giancoli, problem 4. 2.
More informationOther Examples of Energy Transfer
Chapter 7 Work and Energy Overview energy. Study work as defined in physics. Relate work to kinetic energy. Consider work done by a variable force. Study potential energy. Understand energy conservation.
More informationAnother Method to get a Sine Wave. X = A cos θ V = Acc =
LAST NAME FIRST NAME DATE PER CJ Wave Assignment 10.3 Energy & Simple Harmonic Motion Conceptual Questions 3, 4, 6, 7, 9 page 313 6, 7, 33, 34 page 314-316 Tracing the movement of the mass on the end of
More informationChapter 4. Energy. Work Power Kinetic Energy Potential Energy Conservation of Energy. W = Fs Work = (force)(distance)
Chapter 4 Energy In This Chapter: Work Kinetic Energy Potential Energy Conservation of Energy Work Work is a measure of the amount of change (in a general sense) that a force produces when it acts on a
More informationPhysics 103, Practice Midterm Exam 2
Physics 103, Practice Midterm Exam 2 1) A rock of mass m is whirled in a horizontal circle on a string of length L. The period of its motion is T seconds. If the length of the string is increased to 4L
More informationChapter 6. Work and Energy
Chapter 6 Work and Energy 6.1 Work Done by a Constant Force W = Fs 1 N m = 1 joule ( J) 6.1 Work Done by a Constant Force W = ( F cosθ )s cos0 = 1 cos90 = 0 cos180 = 1 6.1 Work Done by a Constant Force
More informationP = dw dt. P = F net. = W Δt. Conservative Force: P ave. Net work done by a conservative force on an object moving around every closed path is zero
Power Forces Conservative Force: P ave = W Δt P = dw dt P = F net v Net work done by a conservative force on an object moving around every closed path is zero Non-conservative Force: Net work done by a
More informationWhich iceboat crosses the finish line with more kinetic energy (KE)?
Two iceboats (one of mass m, one of mass 2m) hold a race on a frictionless, horizontal, frozen lake. Both iceboats start at rest, and the wind exerts the same constant force on both iceboats. Which iceboat
More informationGeneral Physics I Work & Energy
General Physics I Work & Energy Forms of Energy Kinetic: Energy of motion. A car on the highway has kinetic energy. We have to remove this energy to stop it. The brakes of a car get HOT! This is an example
More informationMECHANICAL (TOTAL) ENERGY
DO NOW: 1/19 If you haven t already, please take the short google form survey posted on Edmodo Please turn in your Work done by friction Lab in the top tray POTENTIAL ENERGY Stored energy An object that
More informationChapter Four Holt Physics. Forces and the Laws of Motion
Chapter Four Holt Physics Forces and the Laws of Motion Physics Force and the study of dynamics 1.Forces - a. Force - a push or a pull. It can change the motion of an object; start or stop movement; and,
More informationW = F Δx or W = F Δx cosθ
WORK AND ENERGY When a force acts upon an object to cause a displacement of the object, it is said that work was done upon the object. In order for a force to qualify as having done work on an object,
More informationWORK, ENERGY & POWER Work scalar W = F S Cosθ Unit of work in SI system Work done by a constant force
WORK, ENERGY & POWER Work Let a force be applied on a body so that the body gets displaced. Then work is said to be done. So work is said to be done if the point of application of force gets displaced.
More informationPhysics 2514 Lecture 34
Physics 2514 Lecture 34 P. Gutierrez Department of Physics & Astronomy University of Oklahoma Physics 2514 p. 1/13 Information Information needed for the exam Exam will be in the same format as the practice
More informationSlide 1 / 76. Work & Energy Multiple Choice Problems
Slide 1 / 76 Work & Energy Multiple Choice Problems Slide 2 / 76 1 A driver in a 2000 kg Porsche wishes to pass a slow moving school bus on a 4 lane road. What is the average power in watts required to
More informationMechanics. Time (s) Distance (m) Velocity (m/s) Acceleration (m/s 2 ) = + displacement/time.
Mechanics Symbols: Equations: Kinematics The Study of Motion s = distance or displacement v = final speed or velocity u = initial speed or velocity a = average acceleration s u+ v v v u v= also v= a =
More information(A) 10 m (B) 20 m (C) 25 m (D) 30 m (E) 40 m
PSI AP Physics C Work and Energy (Algebra Based) Multiple Choice Questions (use g = 10 m/s 2 ) 1. A student throws a ball upwards from the ground level where gravitational potential energy is zero. At
More informationAP PHYSICS 1. Energy 2016 EDITION
AP PHYSICS 1 Energy 2016 EDITION Copyright 2016 National Math + Initiative, Dallas, Texas. All rights reserved. Visit us online at www.nms.org. 1 Pre-Assessment Questions Consider a system which could
More informationMachines: Can You lift a car?
Work=Force x Distance 10 m Units of work Nt-m=joules How much work? Machines: Can You lift a car? The ratio of the input force to the output force is called the Mechanical Advantage MA=5000/50=100 1 =
More informationW = F x W = Fx cosθ W = Fx. Work
Ch 7 Energy & Work Work Work is a quantity that is useful in describing how objects interact with other objects. Work done by an agent exerting a constant force on an object is the product of the component
More informationMomentum & Energy Review Checklist
Momentum & Energy Review Checklist Impulse and Momentum 3.1.1 Use equations to calculate impulse; momentum; initial speed; final speed; force; or time. An object with a mass of 5 kilograms is moving at
More information2. What would happen to his acceleration if his speed were half? Energy The ability to do work
1. A 40 kilogram boy is traveling around a carousel with radius 0.5 meters at a constant speed of 1.7 meters per second. Calculate his centripetal acceleration. 2. What would happen to his acceleration
More informationCh 5 Work and Energy
Ch 5 Work and Energy Energy Provide a different (scalar) approach to solving some physics problems. Work Links the energy approach to the force (Newton s Laws) approach. Mechanical energy Kinetic energy
More informationChapter 5 Work and Energy
Chapter 5 Work and Energy Work and Kinetic Energy Work W in 1D Motion: by a Constant orce by a Varying orce Kinetic Energy, KE: the Work-Energy Theorem Mechanical Energy E and Its Conservation Potential
More informationl1, l2, l3, ln l1 + l2 + l3 + ln
Work done by a constant force: Consider an object undergoes a displacement S along a straight line while acted on a force F that makes an angle θ with S as shown The work done W by the agent is the product
More informationPleeeeeeeeeeeeeease mark your UFID, exam number, and name correctly. 20 problems 3 problems from exam 2
Pleeeeeeeeeeeeeease mark your UFID, exam number, and name correctly. 20 problems 3 problems from exam 1 3 problems from exam 2 6 problems 13.1 14.6 (including 14.5) 8 problems 1.1---9.6 Go through the
More informationPhysics 1A Lecture 6B. "If the only tool you have is a hammer, every problem looks like a nail. --Abraham Maslow
Physics 1A Lecture 6B "If the only tool you have is a hammer, every problem looks like a nail. --Abraham Maslow Work Let s assume a constant force F acts on a rolling ball in a trough at an angle θ over
More informationAP Physics. Chapters 7 & 8 Review
AP Physics Chapters 7 & 8 Review 1.A particle moves along the x axis and is acted upon by a single conservative force given by F x = ( 20 4.0x)N where x is in meters. The potential energy associated with
More informationChapter 10-Work, Energy & Power
DULLES HIGH SCHOOL Chapter 10-Work, Energy & Power Energy Transformations Judy Matney 1/12/2016 In this chapter, we will study the concepts of force and work; we will understand the transformations of
More informationChapter 8 Conservation of Energy. Copyright 2009 Pearson Education, Inc.
Chapter 8 Conservation of Energy Units of Chapter 8 Conservative and Nonconservative Forces Potential Energy Mechanical Energy and Its Conservation Problem Solving Using Conservation of Mechanical Energy
More informationLecture PowerPoints. Chapter 6 Physics: Principles with Applications, 7 th edition Giancoli
Lecture PowerPoints Chapter 6 Physics: Principles with Applications, 7 th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching
More information. According to the workenergy theorem (Equation 6.3), the work done by the net external force W catapult
1. REASONING The work done by the catapult catapult is one contribution to the work done by the net external force that changes the kinetic energy of the plane. The other contribution is the work done
More information0J2 - Mechanics Lecture Notes 2
0J2 - Mechanics Lecture Notes 2 Work, Power, Energy Work If a force is applied to a body, which then moves, we say the force does work. In 1D, if the force is constant with magnitude F, and the body moves
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 informationChapter 7: Energy. Consider dropping a ball. Why does the ball s speed increase as it falls?
Chapter 7: Energy Consider dropping a ball. Why does the ball s speed increase as it falls? Viewpoint #1: Force of gravity causes acceleration which causes velocity to change. Viewpoint #2: Force of gravity
More informationPhysics Midterm Review KEY
Name: Date: 1. Which quantities are scalar? A. speed and work B. velocity and force C. distance and acceleration D. momentum and power 2. A 160.-kilogram space vehicle is traveling along a straight line
More informationPSI AP Physics I Work and Energy
PSI AP Physics I Work and Energy Multiple-Choice questions 1. A driver in a 2000 kg Porsche wishes to pass a slow moving school bus on a 4 lane road. What is the average power in watts required to accelerate
More informationWork and Energy continued
Chapter 6 Work and Energy continued 6.2 The Work-Energy Theorem and Kinetic Energy Chapters 1 5 Motion equations were been developed, that relate the concepts of velocity, speed, displacement, time, and
More informationD) No, because of the way work is defined D) remains constant at zero. D) 0 J D) zero
CHAPTER 6 REVIEW NAME 1) Can work be done on a system if there is no motion? A) Yes, if an outside force is provided. B) Yes, since motion is only relative. C) No, since a system which is not moving has
More information2 possibilities. 2.) Work is done and... 1.) Work is done and... *** The function of work is to change energy ***
Work-Energy Theorem and Energy Conservation *** The function of work is to change energy *** 2 possibilities 1.) Work is done and... or 2.) Work is done and... 1 EX: A 100 N box is 10 m above the ground
More informationName Lesson 7. Homework Work and Energy Problem Solving Outcomes
Physics 1 Name Lesson 7. Homework Work and Energy Problem Solving Outcomes Date 1. Define work. 2. Define energy. 3. Determine the work done by a constant force. Period 4. Determine the work done by a
More informationAP Physics First Nine Weeks Review
AP Physics First Nine Weeks Review 1. If F1 is the magnitude of the force exerted by the Earth on a satellite in orbit about the Earth and F2 is the magnitude of the force exerted by the satellite on the
More informationPhysics 10 Lecture 7A. "Energy and persistence conquer all things. --Benjamin Franklin
Physics 10 Lecture 7A "Energy and persistence conquer all things. --Benjamin Franklin Quiz 1 Info It will be a Scantron test covering Chapters 1, 2, 3, 4, 5, and 6. A list of equations, constants, and
More informationPHY 101. Work and Kinetic Energy 7.1 Work Done by a Constant Force
PHY 101 DR M. A. ELERUJA KINETIC ENERGY AND WORK POTENTIAL ENERGY AND CONSERVATION OF ENERGY CENTRE OF MASS AND LINEAR MOMENTUM Work is done by a force acting on an object when the point of application
More informationChapter 8. Potential Energy
Chapter 8 Potential Energy CHAPTER OUTLINE 8. Potential Energy of a System 8.2 The Isolated System Conservation of Mechanical Energy 8.3 Conservative and Nonconservative Forces 8.4 Changes in Mechanical
More informations_3x03 Page 1 Physics Samples
Physics Samples KE, PE, Springs 1. A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy
More information