Ch 8 Potential energy and Conservation of Energy. Question: 2, 3, 8, 9 Problems: 3, 9, 15, 21, 24, 25, 31, 32, 35, 41, 43, 47, 49, 53, 55, 63


 Carol Small
 2 years ago
 Views:
Transcription
1 Ch 8 Potential energ and Conservation of Energ Question: 2, 3, 8, 9 Problems: 3, 9, 15, 21, 24, 25, 31, 32, 35, 41, 43, 47, 49, 53, 55, 63
2 Potential energ Kinetic energ energ due to motion Potential energ energ due to the arrangement of the objects in a sstem (U) Potential energ is due to an objects location. gravitational potential energ due to the separation between two objects elastic potential energ energ associated with the compression or stretching of an elastic object Potential energ is a form of energ so the units are Joules.
3 Potential energ is energ that can be stored and later released to produce motion. Examples: Shove a ball into a spring loaded gun. The elastic potential energ is stored and when ou shoot the ball the potential energ is converted to kinetic energ. After climbing a tree ou have gravitational potential energ stored up. Fall out of the tree that potential energ is converted to kinetic energ as ou fall down.
4 Work and potential energ Throw ball verticall upward. As the ball rises, gravit does negative work on the ball. The ball slowed down (lost kinetic energ). The kinetic energ is transferred to the gravitational potential energ of the ballearth sstem. As the ball is falling, gravit does positive work on the ball. The ball speeds up (gains kinetic energ). The kinetic energ comes from the gravitational potential energ of the ballearth sstem.
5 As ball rises: K < 0 When the gravitational force did negative work, the GPE increased, U > 0. As ball falls: K > 0 When the gravitational force did positive work, the GPE decreased, U < 0. From chapter 7: W = K W =  U
6 Block hitting spring Replace throwing a ball upward with a block sliding into a spring that is fixed to a wall. When the block hits the spring the block has kinetic energ. As the block compresses the spring, it loses kinetic energ and spring gets elastic potential energ. When block comes to rest, all the kinetic energ has been turned into potential energ. As the spring expands the transfer of energ is reversed from potential energ to kinetic energ.
7 Conservative forces Assume a force acts between a sstem of 2 objects. As the force changes the configuration of the sstem, the force does work, W 1, energ is transferred from kinetic energ to some other form of energ. When the change in configuration is reversed, the force does work, W 2, and the transfer of energ is reversed. If W 1 = W 2 is true the other tpe of energ was potential energ. The force is a conservative force. examples: of conservative forces: gravit, springs, electric force
8 If W 1 = W 2 is not alwas true, the force is nonconservative. Examples of nonconservative forces: friction, drag Nonconservative forces convert kinetic energ to thermal energ. Transfers to thermal energ cannot be reversed. Example: Kinetic energ can be lost to friction, but friction cannot be used to produce kinetic energ.
9 Conservative forces are path independent. The work done b a conservative force onl depends on the endpoint. How ou get from the initial configuration to the final configuration does not matter. The net work done b a conservative force around a closed loop is zero. Example: Throw a ball up and let it fall back down. The total work done b gravit is zero. Since conservative forces are path independent, we usuall onl care about the endpoints. This can make a complicated problem easier to solve.
10 Nonconservative forces are path dependent. When dealing with nonconservative forces, such as friction, we need to consider the path the object takes. W f = F f d where d is the path length. A 2 1 B Drag a box over a rough surface from point 1 to point 2. Friction will do more work when using path A than path B. If ou dragged the box along A from 1 to 2 then dragged it back using path B the total work done b friction is not zero.
11 How to calculate values of potential energ. In general, the work done b a force is: W x x F( x) dx Since U = W U i f x x i f F( x) dx Gravitational Potential Energ (picking up to be positive) U U mg i f ( mg) d mg i f d mg( f i )
12 Gravitational Potential Energ Change in GPE from one point to another is: U i f ( mg) d mg mg( U mg Onl changes in GPE are phsicall meaningful. U U i = mg( i ) i f We will often compare GPE to the GPE at a reference point. Usuall we use: U i = 0 at i = 0. So: U() = mg d You can set an height to be the zero of GPE. This will be a big convenience in solving problems. f i )
13 Elastic potential energ (EPE) x f x f U ( kx) dx k xdx kx f kx i xi xi 2 2 When spring is relaxed, x i = 0, the U i = 0 U 0 = ½ kx 2 0 U(x) = ½ kx 2 2 Remember from last chapter W s =  ½ kx 2 So this fits U = W
14 Conservation of mechanical energ Mechanical energ: E mech = K + U If ou onl have conservative forces, the total mechanical energ never changes. K 2 + U 2 = K 1 + U 1 and E mech = K + U = 0
15 E mech = K + U = 0 This is definitel one of the most important and most useful rules in phsics. If there are onl conservative forces involved, and there are multiple steps, ou can ignore the intermediate configurations of the sstem. Will see a good example of this later.
16 Potential Energ Curves Graph of potential energ vs. position See fig. 89 For a particle moving in the xdirection U(x) = W = F(x) x F U( x) x du( x) dx The derivative (slope) of the potential energ curve is related to the force.
17 The force doing the work, is the negative of the slope in the potential energ curve. Example: spring U(x) ½ kx 2 du( x) d 1 2 F ( x) ( kx ) dx dx 2 kx U(x) x
18 U(x) + K(x) = E mech K(x) = E mech U(x) Where U(x) = E mech the kinetic energ will be zero. This is a turning point. Think of the potential energ curve as a rollercoaster track. The height of the track is U(x). When the cart reach a point where its total energ is U(x), the cart stops and turns around. In Newtonian (classical phsics), particles are confined between turning points.
19 Equilibrium points. Points on the potential energ curve are said to be either unstable or stable. A point is unstable is a small displacement in either direction will lead to a greater displacement. (relative maxima) A point is stable is after a small displacement in either direction, the particle will return to its original position. (relative minima)
20 Work done b an external force. If positive work is done b an external force on a sstem, energ is transferred to the sstem. Negative work done on a sstem results in energ transferred from the sstem. W = U + E = E mech
21 Friction Look at case where a force, F, dragged a box across a floor. Newton s 2 nd law gives: F f k = ma F a is constant so: v a 2 Fd Fd ma v 2 o f 2 ( v v 2d 1 mv 2 K k 2ad ) f k 1 mv 2 d 2 o f k d
22 The friction between the two surfaces causes their temperatures to rise. The sliding increases the thermal energ b an amount equal in magnitude to the work done b friction: E th = f k d Fd = E mech + f k d = E mech + E th Work done on a sstem when there is friction: W = E mech + E th
23 Conservation of Energ The total energ of a sstem can change onl b amounts of energ that are transferred to or from the sstem. Energies to be considered are mechanic, thermal, and internal When work is done, the work is equal to the sum of the changes in these tpes of energies. W = E = E mech + E th + E int
24 Conservation of energ for an isolated sstem: E mech + E th + e int = 0 For an isolated sstem, the total energ cannot change.
25 Power: Average power is the average rate that a force transfers energ from, one tpe to another. P ave E t Instantaneous power: P de dt Problems: 18, 26, 34, 44, 46, 58
Chapter 8: Potential Energy and Conservation of Energy. Work and kinetic energy are energies of motion.
Chapter 8: Potential Energy and Conservation of Energy Work and kinetic energy are energies of motion. Consider a vertical spring oscillating with mass m attached to one end. At the extreme ends of travel
More information8. Potential Energy and Conservation of Energy Potential Energy: When an object has potential to have work done on it, it is said to have potential
8. Potential Energy and Conservation of Energy Potential Energy: When an object has potential to have work done on it, it is said to have potential energy, e.g. a ball in your hand has more potential energy
More informationChapter 6 Work and Energy
Chapter 6 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
More informationWORK DONE BY A CONSTANT FORCE
WORK DONE BY A CONSTANT FORCE The definition of work, W, when a constant force (F) is in the direction of displacement (d) is W = Fd SI unit is the Newtonmeter (Nm) = Joule, J If you exert a force of
More informationPotential Energy and Equilibrium in 1D
Potential Energy and Equilibrium in 1D Figures 627, 628 and 629 of TiplerMosca. du = F x dx A particle is in equilibrium if the net force acting on it is zero: F x = du dx = 0. In stable equilibrium
More informationWork, Energy, Conservation of Energy
This test covers Work, echanical energy, kinetic energy, potential energy (gravitational and elastic), Hooke s Law, Conservation of Energy, heat energy, conservative and nonconservative forces, with soe
More information7. Kinetic Energy and Work
Kinetic Energy: 7. Kinetic Energy and Work The kinetic energy of a moving object: k = 1 2 mv 2 Kinetic energy is proportional to the square of the velocity. If the velocity of an object doubles, the kinetic
More informationChapter 7 WORK, ENERGY, AND Power Work Done by a Constant Force Kinetic Energy and the WorkEnergy Theorem Work Done by a Variable Force Power
Chapter 7 WORK, ENERGY, AND Power Work Done by a Constant Force Kinetic Energy and the WorkEnergy Theorem Work Done by a Variable Force Power Examples of work. (a) The work done by the force F on this
More informationConservative forces and the potential energy function. Nonconservative forces and the workenergy theorem
Nonconservative forces and the workenergy theorem Consider an object falling with airresistance. There are two forces to consider; the gravitational force (conservative) and the drag force (nonconservative).
More informationProblem Set #8 Solutions
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department 8.01L: Physics I November 7, 2015 Prof. Alan Guth Problem Set #8 Solutions Due by 11:00 am on Friday, November 6 in the bins at the intersection
More informationReview D: Potential Energy and the Conservation of Mechanical Energy
MSSCHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.01 Fall 2005 Review D: Potential Energy and the Conservation of Mechanical Energy D.1 Conservative and Nonconservative Force... 2 D.1.1 Introduction...
More informationKE = ½mv 2 PE = mgh W = Fdcosθ THINK ENERGY! (KE F + PE F ) = (KE 0 + PE 0 ) + W NC. Tues Oct 6 Assign 7 Fri Preclass Thursday
Tues Oct 6 Assign 7 Fri Preclass Thursday Conservation of Energy Work, KE, PE, Mech Energy Power To conserve total energy means that the total energy is constant or stays the same. With Work, we now have
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 informationPhysics Notes Class 11 CHAPTER 6 WORK, ENERGY AND POWER
1 P a g e Work Physics Notes Class 11 CHAPTER 6 WORK, ENERGY AND POWER When a force acts on an object and the object actually moves in the direction of force, then the work is said to be done by the force.
More informationwww.mathsbox.org.uk Displacement (x) Velocity (v) Acceleration (a) x = f(t) differentiate v = dx Acceleration Velocity (v) Displacement x
Mechanics 2 : Revision Notes 1. Kinematics and variable acceleration Displacement (x) Velocity (v) Acceleration (a) x = f(t) differentiate v = dx differentiate a = dv = d2 x dt dt dt 2 Acceleration Velocity
More informationSprings. Spring can be used to apply forces. Springs can store energy. These can be done by either compression, stretching, or torsion.
WorkEnergy Part 2 Springs Spring can be used to apply forces Springs can store energy These can be done by either compression, stretching, or torsion. Springs Ideal, or linear springs follow a rule called:
More informationKE =? v o. Page 1 of 12
Page 1 of 12 CTEnergy1. A mass m is at the end of light (massless) rod of length R, the other end of which has a frictionless pivot so the rod can swing in a vertical plane. The rod is initially horizontal
More informationCh 7 Kinetic Energy and Work. Question: 7 Problems: 3, 7, 11, 17, 23, 27, 35, 37, 41, 43
Ch 7 Kinetic Energy and Work Question: 7 Problems: 3, 7, 11, 17, 23, 27, 35, 37, 41, 43 Technical definition of energy a scalar quantity that is associated with that state of one or more objects The state
More informationChapter 8: Conservation of Energy
Chapter 8: Conservation of Energy This chapter actually completes the argument established in the previous chapter and outlines the standing concepts of energy and conservative rules of total energy. I
More informationcharge is detonated, causing the smaller glider with mass M, to move off to the right at 5 m/s. What is the
This test covers momentum, impulse, conservation of momentum, elastic collisions, inelastic collisions, perfectly inelastic collisions, 2D collisions, and centerofmass, with some problems requiring
More informationAP1 WEP. Answer: E. The final velocities of the balls are given by v = 2gh.
1. Bowling Ball A is dropped from a point halfway up a cliff. A second identical bowling ball, B, is dropped simultaneously from the top of the cliff. Comparing the bowling balls at the instant they reach
More informationWork, Kinetic Energy and Potential Energy
Chapter 6 Work, Kinetic Energy and Potential Energy 6.1 The Important Stuff 6.1.1 Kinetic Energy For an object with mass m and speed v, the kinetic energy is defined as K = 1 2 mv2 (6.1) Kinetic energy
More informationWork and Kinetic Energy
Chapter 6 Work and Kinetic Energy PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 6 To understand and calculate
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 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 informationLesson 39: Kinetic Energy & Potential Energy
Lesson 39: Kinetic Energy & Potential Energy Total Mechanical Energy We sometimes call the total energy of an object (potential and kinetic) the total mechanical energy of an object. Mechanical energy
More informationHow to calculate work done by a varying force along a curved path. The meaning and calculation of power in a physical situation
Chapter 6: Work and Kinetic Energy What is work done by a force What is kinetic energy workenergy theorem How to calculate work done by a varying force along a curved path The meaning and calculation
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 informationChapter 6. Work and Energy
Chapter 6 Work and Energy ENERGY IS THE ABILITY TO DO WORK = TO APPLY A FORCE OVER A DISTANCE= Example: push over a distance, pull over a distance. Mechanical energy comes into 2 forms: Kinetic energy
More informationPhysics 201 Homework 5
Physics 201 Homework 5 Feb 6, 2013 1. The (nonconservative) force propelling a 1500kilogram car up a mountain 1.21 10 6 joules road does 4.70 10 6 joules of work on the car. The car starts from rest
More information9. The kinetic energy of the moving object is (1) 5 J (3) 15 J (2) 10 J (4) 50 J
1. If the kinetic energy of an object is 16 joules when its speed is 4.0 meters per second, then the mass of the objects is (1) 0.5 kg (3) 8.0 kg (2) 2.0 kg (4) 19.6 kg Base your answers to questions 9
More informationWork, Energy and Power
Name: KEY Work, Energy and Power Objectives: 1. To understand work and its relation to energy. 2. To understand how energy can be transformed from one form into another. 3. To compute the power from the
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 informationWork and Direction. Work and Direction. Work and Direction. Work and Direction
Calculate the net gravitational force on the shaded ball. Be sure to include the magnitude and direction. Each ball has a mass of 20,000 kg. (0.79N, 22.5 o N of E) Chapter Six Work = Force X distance W
More informationPHYSICS 149: Lecture 15
PHYSICS 149: Lecture 15 Chapter 6: Conservation of Energy 6.3 Kinetic Energy 6.4 Gravitational Potential Energy Lecture 15 Purdue University, Physics 149 1 ILQ 1 Mimas orbits Saturn at a distance D. Enceladus
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 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 informationWork, Power, Energy Multiple Choice. PSI Physics. Multiple Choice Questions
Work, Power, Energy Multiple Choice PSI Physics Name Multiple Choice Questions 1. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement.
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 informationphysics 111N work & energy
physics 111N work & energy conservation of energy entirely gravitational potential energy kinetic energy turning into gravitational potential energy gravitational potential energy turning into kinetic
More informationConservation of Energy Workshop. Academic Resource Center
Conservation of Energy Workshop Academic Resource Center Presentation Outline Understanding Concepts Kinetic Energy Gravitational Potential Energy Elastic Potential Energy Example Conceptual Situations
More informationConservative vs. Nonconservative forces Gravitational Potential Energy. Work done by nonconservative forces and changes in mechanical energy
Next topic Conservative vs. Nonconservative forces Gravitational Potential Energy Mechanical Energy Conservation of Mechanical energy Work done by nonconservative forces and changes in mechanical energy
More informationWork Energy & Power. September 2000 Number 05. 1. Work If a force acts on a body and causes it to move, then the force is doing work.
PhysicsFactsheet September 2000 Number 05 Work Energy & Power 1. Work If a force acts on a body and causes it to move, then the force is doing work. W = Fs W = work done (J) F = force applied (N) s = distance
More informationUniversity Physics 226N/231N Old Dominion University. Newton s Laws and Forces Examples
University Physics 226N/231N Old Dominion University Newton s Laws and Forces Examples Dr. Todd Satogata (ODU/Jefferson Lab) satogata@jlab.org http://www.toddsatogata.net/2012odu Wednesday, September
More information1) 0.33 m/s 2. 2) 2 m/s 2. 3) 6 m/s 2. 4) 18 m/s 2 1) 120 J 2) 40 J 3) 30 J 4) 12 J. 1) unchanged. 2) halved. 3) doubled.
Base your answers to questions 1 through 5 on the diagram below which represents a 3.0kilogram mass being moved at a constant speed by a force of 6.0 Newtons. 4. If the surface were frictionless, the
More informationDay 18 ENERGY CONSERVATION. 1 Introduction: More Kinds of Energy
Day 18 ENERGY CONSERVATION 1 Introduction: More Kinds of Energy Suppose I move an object between two points in space. Also suppose that a force acts on the object as it moves. If the work done by the force
More informationUnit 3 Practice Test: Dynamics
Unit 3 Practice Test: Dynamics Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. What is the common formula for work? a. W = F x c. W = Fd
More informationBounce! Name. Be very careful with the balls. Do not throw them DROP the balls as instructed in the procedure.
Bounce 1 Name Bounce! Be very careful with the balls. Do not throw them DROP the balls as instructed in the procedure. Background information: Energy causes things to happen. During the day, the sun gives
More informationObjective: Work Done by a Variable Force Work Done by a Spring. Homework: Assignment (125) Do PROBS # (64, 65) Ch. 6, + Do AP 1986 # 2 (handout)
Double Date: Objective: Work Done by a Variable Force Work Done by a Spring Homework: Assignment (125) Do PROBS # (64, 65) Ch. 6, + Do AP 1986 # 2 (handout) AP Physics B Mr. Mirro Work Done by a Variable
More informationMCAT Physics Review. Grant Hart
MCAT Physics Review Grant Hart grant_hart@byu.edu Historical areas of emphasis  probably similar in the future Mechanics 25% Fluid Mechanics 20% Waves, Optics, Sound 20% Electricity & Magnetism 10% Nuclear
More informationSHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Exam Name SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 1) A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s.
More informationChapter 11 Work. Chapter Goal: To develop a deeper understanding of energy and its conservation Pearson Education, Inc.
Chapter 11 Work Chapter Goal: To develop a deeper understanding of energy and its conservation. Motivation * * There are also ways to gain or lose energy that are thermal, but we will not study these in
More informationMidterm Solutions. mvr = ω f (I wheel + I bullet ) = ω f 2 MR2 + mr 2 ) ω f = v R. 1 + M 2m
Midterm Solutions I) A bullet of mass m moving at horizontal velocity v strikes and sticks to the rim of a wheel a solid disc) of mass M, radius R, anchored at its center but free to rotate i) Which of
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 informationReview D: Potential Energy and the Conservation of Mechanical Energy
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department o Physics 8. Review D: Potential Energy and the Conservation o Mechanical Energy D.1 Conservative and Nonconservative Force... D.1.1 Introduction... D.1.
More informationCurso20122013 Física Básica Experimental I Cuestiones Tema IV. Trabajo y energía.
1. A body of mass m slides a distance d along a horizontal surface. How much work is done by gravity? A) mgd B) zero C) mgd D) One cannot tell from the given information. E) None of these is correct. 2.
More information1 of 9 10/27/2009 7:46 PM
1 of 9 10/27/2009 7:46 PM Chapter 11 Homework Due: 9:00am on Tuesday, October 27, 2009 Note: To understand how points are awarded, read your instructor's Grading Policy [Return to Standard Assignment View]
More informationPOTENTIAL ENERGY AND CONSERVATION OF ENERGY
Chapter 8: POTENTIAL ENERGY AND CONSERVATION OF ENERGY 1 A good eample of kinetic energy is provided by: A a wound clock spring B the raised weights of a grandfather's clock C a tornado D a gallon of gasoline
More informationPhys 111 Fall P111 Syllabus
Phys 111 Fall 2012 Course structure Five sections lecture time 150 minutes per week Textbook Physics by James S. Walker fourth edition (Pearson) Clickers recommended Coursework Complete assignments from
More informationPS6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.
PS6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,
More informationSummary Notes. to avoid confusion it is better to write this formula in words. time
National 4/5 Physics Dynamics and Space Summary Notes The coloured boxes contain National 5 material. Section 1 Mechanics Average Speed Average speed is the distance travelled per unit time. distance (m)
More informationReview Assessment: Lec 02 Quiz
COURSES > PHYSICS GUEST SITE > CONTROL PANEL > 1ST SEM. QUIZZES > REVIEW ASSESSMENT: LEC 02 QUIZ Review Assessment: Lec 02 Quiz Name: Status : Score: Instructions: Lec 02 Quiz Completed 20 out of 100 points
More informationLAB 6: GRAVITATIONAL AND PASSIVE FORCES
55 Name Date Partners LAB 6: GRAVITATIONAL AND PASSIVE FORCES And thus Nature will be very conformable to herself and very simple, performing all the great Motions of the heavenly Bodies by the attraction
More informationThe Ballistic Pendulum
1 The Ballistic Pendulum Introduction: By this time, you have probably become familiar with the concepts of work, energy, and potential energy, in the lecture part of the course. In this lab, we will be
More informationENERGY CONSERVATION The First Law of Thermodynamics and the Work/KineticEnergy Theorem
PH211 A. La Rosa ENERGY CONSERVATION The irst Law of Thermodynamics and the Work/KineticEnergy Theorem ENERGY TRANSER of ENERGY Heattransfer Q Macroscopic external Work W done on a system ENERGY CONSERVATION
More informationCenter of Mass/Momentum
Center of Mass/Momentum 1. 2. An Lshaped piece, represented by the shaded area on the figure, is cut from a metal plate of uniform thickness. The point that corresponds to the center of mass of the Lshaped
More informationPhysics 125 Practice Exam #3 Chapters 67 Professor Siegel
Physics 125 Practice Exam #3 Chapters 67 Professor Siegel Name: Lab Day: 1. A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the
More informationB) 40.8 m C) 19.6 m D) None of the other choices is correct. Answer: B
Practice Test 1 1) Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.60 s and reaches the level of the top of the pole after a total elapsed time
More informationChapter 9. particle is increased.
Chapter 9 9. Figure 936 shows a three particle system. What are (a) the x coordinate and (b) the y coordinate of the center of mass of the three particle system. (c) What happens to the center of mass
More informationSlide 10.1. Basic system Models
Slide 10.1 Basic system Models Objectives: Devise Models from basic building blocks of mechanical, electrical, fluid and thermal systems Recognize analogies between mechanical, electrical, fluid and thermal
More informationPhysics 53. Oscillations. You've got to be very careful if you don't know where you're going, because you might not get there.
Physics 53 Oscillations You've got to be very careful if you don't know where you're going, because you might not get there. Yogi Berra Overview Many natural phenomena exhibit motion in which particles
More informationWork and Energy. Physics 1425 Lecture 12. Michael Fowler, UVa
Work and Energy Physics 1425 Lecture 12 Michael Fowler, UVa What is Work and What Isn t? In physics, work has a very restricted meaning! Doing homework isn t work. Carrying somebody a mile on a level road
More informationPhysics Midterm Review. MultipleChoice Questions
Physics Midterm Review MultipleChoice Questions 1. A train moves at a constant velocity of 90 km/h. How far will it move in 0.25 h? A. 10 km B. 22.5 km C. 25 km D. 45 km E. 50 km 2. A bicyclist moves
More informationPHYSICS MIDTERM REVIEW
1. The acceleration due to gravity on the surface of planet X is 19.6 m/s 2. If an object on the surface of this planet weighs 980. newtons, the mass of the object is 50.0 kg 490. N 100. kg 908 N 2. If
More information1 of 10 11/23/2009 6:37 PM
hapter 14 Homework Due: 9:00am on Thursday November 19 2009 Note: To understand how points are awarded read your instructor's Grading Policy. [Return to Standard Assignment View] Good Vibes: Introduction
More informationAssignment Work (Physics) Class :Xi Chapter :04: Motion In PLANE
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Assignment Work (Physics) Class :Xi Chapter :04: Motion In PLANE State law of parallelogram of vector addition and derive expression for resultant of two vectors
More informationAP1 Oscillations. 1. Which of the following statements about a springblock oscillator in simple harmonic motion about its equilibrium point is false?
1. Which of the following statements about a springblock oscillator in simple harmonic motion about its equilibrium point is false? (A) The displacement is directly related to the acceleration. (B) The
More informationPHYS 211 FINAL FALL 2004 Form A
1. Two boys with masses of 40 kg and 60 kg are holding onto either end of a 10 m long massless pole which is initially at rest and floating in still water. They pull themselves along the pole toward each
More informationSection 15.1 Energy and Its Forms (pages 446 452)
Section 15.1 and Its Forms (pages 446 452) This section describes how energy and work are related. It defines kinetic energy and potential energy, and gives examples for calculating these forms of energy.
More informationMechanics 1: Conservation of Energy and Momentum
Mechanics : Conservation of Energy and Momentum If a certain quantity associated with a system does not change in time. We say that it is conserved, and the system possesses a conservation law. Conservation
More informationENERGY Types of Energy and Energy Transfers
ENERGY Types of Energy and Energy Transfers Energy is the ability to make something useful happen. These types Light Kinetic an object has due to its motion. Chemical can be released when chemical reactions
More informationLecture 36 (Walker 18.8,18.56,)
Lecture 36 (Walker 18.8,18.56,) Entropy 2 nd Law of Thermodynamics Dec. 11, 2009 Help Session: Today, 3:104:00, TH230 Review Session: Monday, 3:104:00, TH230 Solutions to practice Lecture 36 final on
More informationProblem Set 5 Work and Kinetic Energy Solutions
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department o Physics Physics 8.1 Fall 1 Problem Set 5 Work and Kinetic Energy Solutions Problem 1: Work Done by Forces a) Two people push in opposite directions on
More informationENERGYand WORK (PART I and II) 9MAC
ENERGYand WORK (PART I and II) 9MAC Purpose: To understand work, potential energy, & kinetic energy. To understand conservation of energy and how energy is converted from one form to the other. Apparatus:
More informationPHYS 101 Lecture 10  Work and kinetic energy 101
PHYS 101 Lecture 10  Work and kinetic energy 101 Lecture 10  Work and Kinetic Energy What s important: impulse, work, kinetic energy, potential energy Demonstrations: block on plane balloon with propellor
More informationLAB 6  GRAVITATIONAL AND PASSIVE FORCES
L061 Name Date Partners LAB 6  GRAVITATIONAL AND PASSIVE FORCES OBJECTIVES And thus Nature will be very conformable to herself and very simple, performing all the great Motions of the heavenly Bodies
More informationCOMPONENTS OF VECTORS
COMPONENTS OF VECTORS To describe motion in two dimensions we need a coordinate sstem with two perpendicular aes, and. In such a coordinate sstem, an vector A can be uniquel decomposed into a sum of two
More informationKinematic Physics for Simulation and Game Programming
Kinematic Phsics for Simulation and Game Programming Mike Baile mjb@cs.oregonstate.edu phsicskinematic.ppt mjb October, 05 SI Phsics Units (International Sstem of Units) Quantit Units Linear position
More informationFRICTION, WORK, AND THE INCLINED PLANE
FRICTION, WORK, AND THE INCLINED PLANE Objective: To measure the coefficient of static and inetic friction between a bloc and an inclined plane and to examine the relationship between the plane s angle
More informationAP Physics B Free Response Solutions
AP Physics B Free Response Solutions. (0 points) A sailboat at rest on a calm lake has its anchor dropped a distance of 4.0 m below the surface of the water. The anchor is suspended by a rope of negligible
More informationWork, Energy and Power Practice Test 1
Name: ate: 1. How much work is required to lift a 2kilogram mass to a height of 10 meters?. 5 joules. 20 joules. 100 joules. 200 joules 5. ar and car of equal mass travel up a hill. ar moves up the hill
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 informationEDUH 1017  SPORTS MECHANICS
4277(a) Semester 2, 2011 Page 1 of 9 THE UNIVERSITY OF SYDNEY EDUH 1017  SPORTS MECHANICS NOVEMBER 2011 Time allowed: TWO Hours Total marks: 90 MARKS INSTRUCTIONS All questions are to be answered. Use
More informationEnergy  Key Vocabulary
Energy  Key Vocabulary Term Potential Energy Kinetic Energy Joules Gravity Definition The energy an object possesses due to its position. PE = mgh The energy an object possesses when it is in motion.
More information10.1 Quantitative. Answer: A Var: 50+
Chapter 10 Energy and Work 10.1 Quantitative 1) A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 4.8 m above the ground. What is the mass
More informationNotes: Mechanics. The Nature of Force, Motion & Energy
Notes: Mechanics The Nature of Force, Motion & Energy I. Force A push or pull. a) A force is needed to change an object s state of motion. b) Net force The sum (addition) of all the forces acting on an
More informationPhysics 2AB Notes  2012. Heating and Cooling. The kinetic energy of a substance defines its temperature.
Physics 2AB Notes  2012 Heating and Cooling Kinetic Theory All matter is made up of tiny, minute particles. These particles are in constant motion. The kinetic energy of a substance defines its temperature.
More informationLab 5: Conservation of Energy
Lab 5: Conservation of Energy Equipment SWS, 1meter stick, 2meter stick, heavy duty bench clamp, 90cm rod, 40cm rod, 2 double clamps, brass spring, 100g mass, 500g mass with 5cm cardboard square
More informationCentripetal Force. 1. Introduction
1. Introduction Centripetal Force When an object travels in a circle, even at constant speed, it is undergoing acceleration. In this case the acceleration acts not to increase or decrease the magnitude
More information