Drink 633kJ (Monster Energy 340 ml) /20 = m (Push the chair for 31 km!)
|
|
- Madeleine Caldwell
- 5 years ago
- Views:
Transcription
1 Work-Energy-Power Page 1 Work (Ch 16) Work, Energy, is measured in JOULES W = F * S (Joules) = (Newtons) * (Metres) ONLY IF THE DISTANCE IS IN SAME DIRECTION AS FORCE! Note: Torque is in Nm Joules is in Nm?????????? These are NOT the same because... Torque: N is perpendicular to m Work: N is parallel to m Push a Chair along the floor... 20J = 20N * 1m Drink 633kJ (Monster Energy 340 ml) /20 = m (Push the chair for 31 km!) Person weighs 70kg climbs a 400m high tower. Energy? W = F * S W= (70*9.81) * 400 = 274,680 J (About a "Monster") PE = mgh (gravity only!). Full name = Gravitational Potential Energy Work, Energy, is measured in JOULES W = T * Angle (Joules) = (Newton-metres) * (Radians-a ratio = non-units) Flywheel does 200 revolutions with a torque of 35 Nm. Find Work done. W = T * Angle 200 revs = 200 * 2 * pi = rad W = 35 * = J (43.98 kj) POWER P = W / t (Watts) = (Joules) / (s) So if W = FS then P = F*S/t = Fv Also in rotation P = T
2 Work-Energy-Power Page 2 P = T E.g. Keep moving the chair at 1 m/s P = W/t = 20 / 1 = 20 W Electrical motor (12V) P = VI I = P/V = 20/12 = Amps Human power: Cyclist 400W high for W/kg James Watt measured Horse Power. (1 HP = 736 W) Hawkesbury Lookout: Height = 200m, Time 8:43 W = F * S Pretend a ladder W = (68+9)*9.81 * 200 = 151,074 J If ladder guy does it in 8:43 min, what is his power? Seconds = 8* = 523 s P=W/t = 151,074 / 523 = W BTW: How fast is the ladder guy going? s= 200m, t = 523secs: V=s/t = 200/523 = m/s Notice the bicycle was 333W, but ladder is 289W. (Air friction and rolling friction) Work and Acceleration: You may want to use this formula sometimes - or you may not. W = 0.5 * m (v 2 - v o2 ) E.g. A car accelerated from rest to 72 km/h in 16s. Mass = 1.2t Find Power. Linear motion: vo = 0, v1 = 72/3.6 = 20 m/s, t = 16s, a? V = vo+at a = (v-vo)/t = 20 / 16 = 1.25 m/s 2 F= ma = 1200 * 1.25 = 1500 N W = FS Find distance S: (linear motion) S = v 2 / 2a = 20^2 / (2 * 1.25) = 160 m W = FS = 1500 * 160 = J Average Power: P = W/t = / 16 = W (15 kw) Try a faster car: 0-100km/h in 4s. Tesla Roadster 1235kg
3 Work-Energy-Power Page 3 Linear motion: vo = 0, v1 = 100/3.6 = m/s, t = 4s, a? V = v o +at a = (v-v o )/t = / 4 = m/s 2 F= ma = 1235 * = N W = FS Find distance S: (linear motion) S = v 2 / 2a = ^2 / (2 * ) = m W = FS = * = J Average Power: P = W/t = /4 = W (119 kw) This is so boring!! Let's try the super-duper energy method... Work out KE when at 100km/h KE = 0.5*1235* ^2 = J (476.5kJ) This took 4s, so power = W/t = / 4 = kw See? Told you that energy is a marvelous method for the benefit of mankind and gives you goose bumps...
4 Work-Energy-Power Page 4 Springs Tuesday, 1 May :12 PM F = kx k = spring constant (N/m) X = displacement (deformation) F = force (N) Force is increasing as the spring is compressed/stretched. So average force = (F0 + F1) / 2 WORK (or energy stored) of a SPRING W=FS (where force is average) W = 0.5 * kx 2 Example: A spring is stretched 12mm. Spring constant is 200N/mm. Find F: Convert 200N/mm to N/m. k = 200*1000 = N/m, (in m) F = kx = *0.012 = 2400 N (in mm) F = kx = 200 * 12 = 2400 N W = 0.5 * kx 2 = 0.5 * *0.012^2 = 14.4 J (See p244) Watch out! W = FS = 2400*0.012 = 28.8 J (Supposed to be 14.4!!!!)
5 Energy (Ch 17) All types of energy are measured in Joules Potential Energy PE = mgh m = mass (kg) g = gravity accel m/s 2 h = height (m) E.g: Climb up a ladder; Hawkesbury Lookout: Height = 200m, Time 8:43 Pretend to climb up by a ladder W = F * S W = (68+9)*9.81 * 200 = 151,074 J Now use PE formula: PE = mgh W = (68+9)*9.81 * 200 = 151,074 J Exactly the same! So PE = mgh is really just W=FS where F=mg! Wow! Exciting! Kinetic Energy (Linear) KE = 0.5mv 2 m = mass (kg) v = velocity (m/s) Fall off that cliff from top of ladder What speed at bottom? (Well, just before the bottom ) v 0 = 0, s = 200m, a = 9.81m/s 2, v =? v 2 = v as = 2 * 9.81 * 200 = 3924 So square root.. v = 3924^0.5 = m/s (which is *3.6 = km/h) Ouch! What is KE? KE = 0.5mv 2 = 0.5 * (68 + 9) * ^2 = 151, J Wow! It's the same as the PE we got when we climbed up 151,074 J Kinetic Energy (Rotational) KE = 0.5I Work-Energy-Power Page 5
6 Work-Energy-Power Page 6 KE = 0.5I 2 I = Mass moment of Inertia (kgm 2 ) = velocity (rad/s) Check units: (kg * m * m ) * (1/s) * (1/s) = kgm 2 /s 2 This is supposed to be Joules. W = FS = mas = kg * m* (1/s) * (1/s) * m = kgm 2 /s 2 Yes! Same units! So a Joule is kgm 2 /s 2, which is why we call it Joules! Spring Energy SE = 0.5kx 2 k = Spring constant (N/m) x = displacement or deformation (m)
7 Work-Energy-Power Page 7 Spring Energy Tuesday, 30 April :41 PM Q8: (cont) A mass of 491grams stretches this spring by 25mm. How much work did the mass apply to the spring? k = (0.491*9.81) / 25 = N/mm SE = 0.5 k x 2 = 0.5 * * 25^2 = "Nmm" = /1000 = J To show you how dangerous it is NOT to use m k = (0.491*9.81) /0.025 = N/m SE = 0.5 k x 2 = 0.5 * * 0.025^2 = J Kinetic Energy Q15: Calculate the kinetic energy of a 1.4 tonne car at 82 km/h. v = 82/3.6 = m/s KE = 0.5 *1400* ^2 = kj v = 164/3.6 = m/s KE = 0.5 *1400* ^2 = kj Q9: In raising the bucket a force of 192N was applied to the handle (radius 360mm). After 46 revolutions, how much work has been done? Looking only at the handle itself: Using W = T* T = F*r = 192*0.36 = Nm = 46*2*pi = rad W = T* * = 19,978 J ( kj)
8 Work-Energy-Power Page 8 Flywheel Generator Tuesday, 17 March :50 PM Q17: This flywheel has a mass moment of inertia of 0.2 kgm² and rotates at RPM. Calculate the kinetic energy *pi/30 = rad/s KE = 0.5I 2 = 0.5*0.2*5455.9^2 = E6 J = MJ Q18: This flywheel has a mass moment of inertia of 0.21 kgm² and rotates at RPM. What power could it supply for 27s if RPM reduces to 75%? At 100% speed 51200*pi/30 = rad/s KE = 0.5I 2 = 0.5*0.21*5361.7^2 = E6 J At 75% speed 51200*pi/30 = rad/s KE = 0.5I 2 = 0.5*0.21* ^2 = E6 J Total Energy lost = E E6 = E6 J P = W/t = E6/27 = 48911W (48.9 kw)
9 Work-Energy-Power Page 9 Car Hoist Tuesday, 17 March :05 PM Q20: A garage hoist lifts a 1.7 tonne car up through a height of 1.9m. (a) How much work was done to lift the car? W = FS = mgh (same as PE) PE = mgh = 1700*9.81*1.9 = J Q21: (cont) A garage hoist lifts a 1.7 tonne car by 1.9m. (b) If it takes 19 seconds, what was the power applied to lift the car? Time t = 19s P=W/t = /19 = W
10 Work-Energy-Power Page 10 Lathe Tuesday, 17 March :14 PM Q26: During a lathe turning operation, which force (or forces) on the cutting tool are directly opposing the work being done? Work is only done if the force is in same direction as the motion Q27: Shaft diameter=78mm, length=484mm. F1=270N, F2=1630N, F3= 550N. (a) How much work was done by the leadscrew in moving the tool horizontally? Which Force? F1, F2 or F3? Work = F * S = 550 * = J Q28: (cont) Diameter=78mm, length=484mm. F1=270N, F2=1630N, F3 =550N. Feed=0.33mm. (b) How much work was done by the headstock in rotating the job? Which Force? F1, F2 or F3? Work = F * S S = distance of the tool on the job = the length of the whole spiral = how many revs*circumference. Revs = 484/0.33 = revs Circumference = pi*0.078 = m S = * = m Work = F2 * S = 1630 * = J Q29: (cont) Diameter=78mm, length=484mm. F1=270N, F2=1630N, F3 =550N. Feed=0.33mm. Cutting Speed=19m/min. (c) How much time does it take to do the cut?
11 Work-Energy-Power Page 11 does it take to do the cut? Find time. Cutting speed = 19m/minute / 19 = minutes = *60 = 1135 s Q30: (cont) Diameter=78mm, length=484mm. F1=270N, F2=1630N, F3 =550N. Feed=0.33mm. Cutting Speed=19m/min. (d) What power is needed to rotate the shaft during the cut? (Ignore leadscrew) Find power P = W / t = / 1135 = W
Work 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 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 informationObjectives. Power in Translational Systems 298 CHAPTER 6 POWER
Objectives Explain the relationship between power and work. Explain the relationship between power, force, and speed for an object in translational motion. Calculate a device s efficiency in terms of the
More informationWEP-Work and Power. What is the amount of work done against gravity as an identical mass is moved from A to C? J J J 4.
1. The work done in accelerating an object along a frictionless horizontal surface is equal to the change in the object s 1. momentum 2. velocity 3. potential energy 4. kinetic energy 2. The graph below
More informationWhat is Energy? Energy is the capacity to do work
What is Energy? Energy is the capacity to do work Work the product of force exerted on an object and the distance the object moves in the direction of the force. W=Fd W = work (Joules, J) F = force (N)
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 informationFoundations of Physical Science. Unit 2: Work and Energy
Foundations of Physical Science Unit 2: Work and Energy Chapter 5: Work, Energy, and Power 5.1 Work 5.2 Energy Conservation 5.3 Energy Transformations Learning Goals Calculate the amount of work done by
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 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 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 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 informationCHAPTER 6: IN AN ISOLATED SYSTEM, ENERGY IS TRANSFERRED FROM ONE OBJECT TO ANOTHER WHENEVER WORK IS DONE
CHAPTER 6: IN AN ISOLATED SYSTEM, ENERGY IS TRANSFERRED FROM ONE OBJECT TO ANOTHER WHENEVER WORK IS DONE 6.1 Work and Energy In science, work is done when a force acts over a displacement; energy is transferred.
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 informationPreparing for Six Flags Physics Concepts
Preparing for Six Flags Physics Concepts uniform means constant, unchanging At a uniform speed, the distance traveled is given by Distance = speed x time At uniform velocity, the displacement is given
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is
More informationRotational Dynamics continued
Chapter 9 Rotational Dynamics continued 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis ROTATIONAL ANALOG OF NEWTON S SECOND LAW FOR A RIGID BODY ROTATING ABOUT A FIXED AXIS I = ( mr 2
More informationEDEXCEL NATIONAL CERTIFICATE/DIPLOMA SCIENCE FOR TECHNICIANS OUTCOME 3 - ENERGY TUTORIAL 1 MECHANICAL WORK, ENERGY AND POWER: WORK
EDEXCEL NATIONAL CERTIFICATE/DIPLOMA SCIENCE FOR TECHNICIANS OUTCOME 3 - ENERGY TUTORIAL 1 MECHANICAL WORK, ENERGY AND POWER: WORK 3 Energy Mechanical work, energy and power: work - energy relationship,
More informationChapter Work, Energy and Power. Q1. The co-efficient of restitution e for a perfectly elastic collision is [1988] (a) 1 (b) 0 (c) (d) 1 Ans: (a)
Chapter Work, Energy and Power Q1. The co-efficient of restitution e for a perfectly elastic collision is [1988] (a) 1 (b) 0 (c) (d) 1 Q2. A bullet of mass 10g leaves a rifle at an initial velocity of
More informationMidterm 3 Review (Ch 9-14)
Midterm 3 Review (Ch 9-14) PowerPoint Lectures for University Physics, Twelfth Edition Hugh D. Young and Roger A. Freedman Lectures by James Pazun Copyright 2008 Pearson Education Inc., publishing as Pearson
More informationName Class Date. In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question.
Assessment Chapter Test A ork and Energy MULTIPLE CHOICE In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. In which of the
More informationLecture 7 Chapter 7 Work Energy Potential Energy Kinetic Energy
Lecture 7 Chapter 7 Work Energy Potential Energy Kinetic Energy Energy -- The money of physics Demo: Elastic Collisions Objects of equal mass exchange momentum in elastic collisions. 1 Demo: Blaster Balls
More informationPSC1341 Chapter 3 Work, Power and Momentum
PSC1341 Chapter 3 Work, Power and Momentum Chapter 3: Work, Power and Momentum A. Work B. Power C. Simple Machines D. Energy E. Kinetic energy F. Potential energy G. Law of Conservation of Energy H. Momentum
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 informationPHYS 111 HOMEWORK #11
PHYS 111 HOMEWORK #11 Due date: You have a choice here. You can submit this assignment on Tuesday, December and receive a 0 % bonus, or you can submit this for normal credit on Thursday, 4 December. If
More informationWork changes Energy. Do Work Son!
1 Work changes Energy Do Work Son! 2 Do Work Son! 3 Work Energy Relationship 2 types of energy kinetic : energy of an object in motion potential: stored energy due to position or stored in a spring Work
More informationKINETIC AND POTENTIAL ENERGY. Chapter 6 (cont.)
KINETIC AND POTENTIAL ENERGY Chapter 6 (cont.) The Two Types of Mechanical Energy Energy- the ability to do work- measured in joules Potential Energy- energy that arises because of an object s position
More informationPhysics Year 11 Term 1 Week 7
Physics Year 11 Term 1 Week 7 Energy According to Einstein, a counterpart to mass An enormously important but abstract concept Energy can be stored (coal, oil, a watch spring) Energy is something moving
More informationPHYS 101 Previous Exam Problems. Kinetic Energy and
PHYS 101 Previous Exam Problems CHAPTER 7 Kinetic Energy and Work Kinetic energy Work Work-energy theorem Gravitational work Work of spring forces Power 1. A single force acts on a 5.0-kg object in such
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 informationWORK & ENERGY Work Work Energy Thm. Kinetic Energy Power Potential Energy Conservation of Energy
WORK & ENERGY Work Work Energy Thm. Kinetic Energy Power Potential Energy Conservation of Energy WORK & ENERGY Work: Transfer of energy through motion Energy: Ability to cause Change Kinetic Energy: Energy
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 informationCBSE Class 9 Work Energy and Power Quick Study Chapter Note
CBSE Class 9 Work Energy and Power Quick Study Chapter Note Work: In our daily life anything that makes us tired is known as work. For example, reading, writing, painting, walking, etc. In physics work
More informationImportant: This test consists of 15 multiple choice problems, each worth points.
Physics 214 Practice Exam 1 C Fill in on the OPSCAN sheet: 1) Name 2) Student identification number 3) Exam number as 01 4) Sign the OPSCAN sheet Important: This test consists of 15 multiple choice problems,
More informationPH7_UnitPacketCompleteKey
Page 1 of 45 Page 2 of 45 Unit Packet Contents 1. Unit Objectives 2. Notes: Potential / Kinetic Energy 3. Guided Practice: Potential and Kinetic Energy 4. Independent Practice Potential and Kinetic Energy
More informationWork and the Work-Energy Theorem
Work and Energy Click on the topic to go to that section Energy and the Work-Energy Theorem Work and Energy 2009 by Goodman & Zavorotniy Forces and Potential Energy Conservation of Energy Power Conservation
More informationW = Fd cos θ. W = (75.0 N)(25.0 m) cos (35.0º) = 1536 J = J. W 2400 kcal =
8 CHAPTER 7 WORK, ENERGY, AND ENERGY RESOURCES generator does negative work on the briefcase, thus removing energy from it. The drawing shows the latter, with the force from the generator upward on the
More information1 1. A spring has a spring constant of 120 newtons/meter. How much potential energy is stored in the spring as it is stretched 0.20 meter?
Page of 3 Work Power And Energy TEACHER ANSWER KEY March 09, 200. A spring has a spring constant of 20 newtons/meter. How much potential energy is stored in the spring as it is stretched 0.20 meter?. 2.
More informationEssentially, the amount of work accomplished can be determined two ways:
1 Work and Energy Work is done on an object that can exert a resisting force and is only accomplished if that object will move. In particular, we can describe work done by a specific object (where a force
More informationPhysics 20 Lesson 26 Energy, Work and Power
Physics 20 Lesson 26 Energy, Work and Power Let us recap what we have learned in Physics 20 so far. At the beginning of the course we learned about kinematics which is the description of how objects move
More informationPre Comp Review Questions 7 th Grade
Pre Comp Review Questions 7 th Grade Section 1 Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s second s. Temperature Kelvin K Fahrenheit
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 informationChapter 7. Work and Kinetic Energy
Chapter 7 Work and Kinetic Energy P. Lam 7_16_2018 Learning Goals for Chapter 7 To understand the concept of kinetic energy (energy of motion) To understand the meaning of work done by a force. To apply
More informationThe relationship between force and distance has a name. WORK
EWP The relationship between force and distance has a name. WORK WORK - the product of the net force and distance through which an object moves in the direction of the net force. W=F d where W=work joules
More informationElastic Potential Energy
Elastic Potential Energy If you pull on a spring and stretch it, then you do work. That is because you are applying a force over a displacement. Your pull is the force and the amount that you stretch the
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 informationPre Comp Review Questions 8 th Grade Answers
Pre Comp Review Questions 8 th Grade Answers Section 1 Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s second s. Temperature Kelvin
More informationMechanics & Properties of Matter 5: Energy and Power
Mechanics & Properties of Matter 5: Energy and Power Energy and Power AIM This unit re-introduces the formulae for calculating work done, potential energy, kinetic energy and power. The principle that
More informationLesson 3A Energy, Work and Power
Physics 30 Lesson 3A Energy, Work and Power I. Energy and its forms The idea of Energy is the most fundamental principle in all of science. Everything in the universe is a manifestation or form of Energy.
More informationPhysics 180A Test Points
Physics 180A Test 3-10 Points Name You must complete six of the nine 10-point problems. You must completely cross off three 10-problems, thanks. Place your answers in the answer box. Watch your units and
More informationWork and energy. 15 m. c. Find the work done by the normal force exerted by the incline on the crate.
Work and energy 1. A 10.0-kg crate is pulled 15.0 m up along a frictionless incline as shown in the figure below. The crate starts at rest and has a final speed of 6.00 m/s. motor 15 m 5 a. Draw the free-body
More informationNCERT solution for Work and energy
1 NCERT solution for Work and energy Question 1 A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (See below figure). Let us take it that the force acts on the
More informationChapter 6 Work and Energy
Chapter 6 Work and Energy Units of Chapter 6 Work Done by a Constant Force Work Done by a Varying Force Kinetic Energy, and the Work-Energy Principle Potential Energy Conservative and Nonconservative Forces
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 for Scientist and Engineers third edition Rotational Motion About a Fixed Axis Problems
A particular bird s eye can just distinguish objects that subtend an angle no smaller than about 3 E -4 rad, A) How many degrees is this B) How small an object can the bird just distinguish when flying
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 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 informationChapter 8: Momentum, Impulse, & Collisions. Newton s second law in terms of momentum:
linear momentum: Chapter 8: Momentum, Impulse, & Collisions Newton s second law in terms of momentum: impulse: Under what SPECIFIC condition is linear momentum conserved? (The answer does not involve collisions.)
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 informationName 09-MAR-04. Work Power and Energy
Page 1 of 16 Work Power and Energy Name 09-MAR-04 1. A spring has a spring constant of 120 newtons/meter. How much potential energy is stored in the spring as it is stretched 0.20 meter? 1. 2.4 J 3. 12
More informationDYNAMICS MOMENT OF INERTIA
DYNAMICS MOMENT OF INERTIA S TO SELF ASSESSMENT EXERCISE No.1 1. A cylinder has a mass of 1 kg, outer radius of 0.05 m and radius of gyration 0.03 m. It is allowed to roll down an inclined plane until
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 informationΣE before ± W = ΣE after
The Law of Conservation of Energy The Law of Conservation of Energy states: Energy is never created nor destroyed just transformed into other forms of energy. OR ΣE before = ΣE after Yet if energy is added
More informationEfficiency = power out x 100% power in
Work, Energy and Power Review Package 1) Work: change in energy. Measured in Joules, J. W = Fd W = ΔE Work is scalar, but can be negative. To remember this, ask yourself either: Is the object is losing
More informationCHAPTER 6 1. Because there is no acceleration, the contact force must have the same magnitude as the weight. The displacement in the direction of this force is the vertical displacement. Thus, W = F Æy
More informationAP Physics 1 Work Energy and Power Practice Test Name
AP Physics 1 Work Energy and Power Practice Test Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two objects, one of mass m and the other
More informationPhys101 Lectures 9 and 10 Conservation of Mechanical Energy
Phys101 Lectures 9 and 10 Conservation of Mechanical Energy Key points: Conservative and Nonconservative Forces Potential Energy Generalized work-energy principle Mechanical Energy and Its Conservation
More informationLecture 5. Work Energy
Lecture 5 Work Energy Work, Energy Work and energy are fundamental physical quantities in science. Work is done when a force moves an object through a distance. Energy is the ability to do work The unit
More informationThermodynamics I Spring 1432/1433H (2011/2012H) Saturday, Wednesday 8:00am - 10:00am & Monday 8:00am - 9:00am MEP 261 Class ZA
Thermodynamics I Spring 1432/1433H (2011/2012H) Saturday, Wednesday 8:00am - 10:00am & Monday 8:00am - 9:00am MEP 261 Class ZA Dr. Walid A. Aissa Associate Professor, Mech. Engg. Dept. Faculty of Engineering
More informationPhysics 130: Questions to study for midterm #1 from Chapter 7
Physics 130: Questions to study for midterm #1 from Chapter 7 1. Kinetic energy is defined to be one-half the a. mass times the speed. b. mass times the speed squared. c. mass times the acceleration. d.
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 informationTIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES. PHYS 1111, Exam 2 Section 1 Version 1 November 2, 2005 Total Weight: 100 points
TIME OF COMPLETION NAME SOLUTION DEPARTMENT OF NATURAL SCIENCES PHYS 1111, Exam Section 1 Version 1 November, 005 Total Weight: 100 points 1. Check your examination for completeness prior to starting.
More information. d. v A v B. e. none of these.
General Physics I Exam 3 - Chs. 7,8,9 - Momentum, Rotation, Equilibrium Oct. 28, 2009 Name Rec. Instr. Rec. Time For full credit, make your work clear to the grader. Show the formulas you use, the essential
More informationChapter 7 Kinetic Energy and Work
Prof. Dr. I. Nasser Chapter7_I 14/11/017 Chapter 7 Kinetic Energy and Work Energy: Measure of the ability of a body or system to do work or produce a change, expressed usually in joules or kilowatt hours
More informationgains gravitational... energy. (1) Use the correct equation from the Physics Equations Sheet
Q1. The diagram shows a climber part way up a cliff. (a) Complete the sentence. When the climber moves up the cliff, the climber gains gravitational... energy. (b) The climber weighs 660 N. (i) Calculate
More informationb) What does each letter (or symbol) stand for in this equation? c) What are the corresponding SI units? (Write: symbol $ unit).
First Name: Last Name: 1. a) What is Newton s Second Law in formula form? b) What does each letter (or symbol) stand for in this equation? c) What are the corresponding SI units? (Write: symbol $ unit).
More informationUNITS AND DEFINITIONS RELATED TO BIOMECHANICAL AND ELECTROMYOGRAPHICAL MEASUREMENTS
APPENDIX B UNITS AND DEFINITIONS RELATED TO BIOMECHANICAL AND ELECTROMYOGRAPHICAL MEASUREMENTS All units used are SI (Système International d Unités). The system is based on seven well-defined base units
More informationPROBLEM Copyright McGraw-Hill Education. Permission required for reproduction or display. SOLUTION
PROLEM 7. The rotor of an electric motor has an angular velocity of 600 rpm when the load and power are cut off. The 0-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest.
More informationChapter 14 Oscillations. Copyright 2009 Pearson Education, Inc.
Chapter 14 Oscillations Oscillations of a Spring Simple Harmonic Motion Energy in the Simple Harmonic Oscillator Simple Harmonic Motion Related to Uniform Circular Motion The Simple Pendulum The Physical
More informationPHYSICS 111 SPRING EXAM 2: March 6, 2018; 8:15-9:45 pm
PHYSICS 111 SPRING 2018 EXAM 2: March 6, 2018; 8:15-9:45 pm Name (printed): Recitation Instructor: Section # INSTRUCTIONS: This exam contains 20 multiple-choice questions plus 1 extra credit question,
More informationLANMARK UNIVERSITY OMU-ARAN, KWARA STATE DEPARTMENT OF MECHANICAL ENGINEERING COURSE: MECHANICS OF MACHINE (MCE 322). LECTURER: ENGR.
LANMARK UNIVERSITY OMU-ARAN, KWARA STATE DEPARTMENT OF MECHANICAL ENGINEERING COURSE: MECHANICS OF MACHINE (MCE 322). LECTURER: ENGR. IBIKUNLE ROTIMI ADEDAYO SIMPLE HARMONIC MOTION. Introduction Consider
More informationWork and Energy Energy Conservation
Work and Energy Energy Conservation MidterM 1 statistics Mean = 16.48 Average = 2.74 2 Clicker Question #5 Rocket Science!!! The major principle of rocket propulsion is: a) Conservation of energy b) Conservation
More informationIn this lecture we will discuss three topics: conservation of energy, friction, and uniform circular motion.
1 PHYS:100 LECTURE 9 MECHANICS (8) In this lecture we will discuss three topics: conservation of energy, friction, and uniform circular motion. 9 1. Conservation of Energy. Energy is one of the most fundamental
More informationQ1. Which of the following is the correct combination of dimensions for energy?
Tuesday, June 15, 2010 Page: 1 Q1. Which of the following is the correct combination of dimensions for energy? A) ML 2 /T 2 B) LT 2 /M C) MLT D) M 2 L 3 T E) ML/T 2 Q2. Two cars are initially 150 kilometers
More informationWORK, POWER AND ENERGY
WORK, POWER AND ENERGY Important Points:. Dot Product: a) Scalar product is defined as the product of the magnitudes of two vectors and the cosine of the angle between them. The dot product of two vectors
More informationPage 1. Name:
Name: 3834-1 - Page 1 1) If a woman runs 100 meters north and then 70 meters south, her total displacement is A) 170 m south B) 170 m north C) 30 m south D) 30 m north 2) The graph below represents the
More informationPS 11 GeneralPhysics I for the Life Sciences
PS 11 GeneralPhysics I for the Life Sciences ROTATIONAL MOTION D R. B E N J A M I N C H A N A S S O C I A T E P R O F E S S O R P H Y S I C S D E P A R T M E N T F E B R U A R Y 0 1 4 Questions and Problems
More informationMechanics II. Which of the following relations among the forces W, k, N, and F must be true?
Mechanics II 1. By applying a force F on a block, a person pulls a block along a rough surface at constant velocity v (see Figure below; directions, but not necessarily magnitudes, are indicated). Which
More informationPower. Power is the rate at which energy is transformed from one type to another: Average power: Power is a scalar quantity. Unit:
Power Power is the rate at which energy is transformed from one type to another: Average power: Power is a scalar quantity. Unit: Alternative expression for power: if F is parallel to Δx. Example problem:
More information0.1 Work. W net = T = T f T i,
.1 Work Contrary to everyday usage, the term work has a very specific meaning in physics. In physics, work is related to the transfer of energy by forces. There are essentially two complementary ways to
More informationReview for Exam 2 S 2019
Review for Exam 2 S 2019 R1. Work W = F.d (in N m =Joules = J If we know the angle between vectors, q F.d = F d cos q F = (1, 2, 3) F =sqrt(1+4+9)=~4 d = (4, 5, 6) d =sqrt(16+25+36)~9 q=10; W=F d cos(60)
More informationChapter 5: Energy. Energy is one of the most important concepts in the world of science. Common forms of Energy
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
More informationChapter 8- Rotational Kinematics Angular Variables Kinematic Equations
Chapter 8- Rotational Kinematics Angular Variables Kinematic Equations Chapter 9- Rotational Dynamics Torque Center of Gravity Newton s 2 nd Law- Angular Rotational Work & Energy Angular Momentum Angular
More informationWork Energy Review. 1. Base your answer to the following question on the information and diagram below and on your knowledge of physics.
Name: ate: 1. ase your answer to the following question on the information and diagram below and on your knowledge of physics. student pushes a box, weighing 50. newtons, 6.0 meters up an incline at a
More informationChapter 8 continued. Rotational Dynamics
Chapter 8 continued Rotational Dynamics 8.4 Rotational Work and Energy Work to accelerate a mass rotating it by angle φ F W = F(cosθ)x x = rφ = Frφ Fr = τ (torque) = τφ r φ s F to x θ = 0 DEFINITION OF
More informationPHYS 1114, Lecture 33, April 10 Contents:
PHYS 1114, Lecture 33, April 10 Contents: 1 This class is o cially cancelled, and has been replaced by the common exam Tuesday, April 11, 5:30 PM. A review and Q&A session is scheduled instead during class
More informationPhysics. Assignment-1(UNITS AND MEASUREMENT)
Assignment-1(UNITS AND MEASUREMENT) 1. Define physical quantity and write steps for measurement. 2. What are fundamental units and derived units? 3. List the seven basic and two supplementary physical
More information- Conservation of Energy Notes Teacher Key -
NAME: DATE: PERIOD: PHYSICS - Conservation of Energy Notes Teacher Key - - Is Energy Conserved? - Determine the max height that a 5kg cannonball will reach if fired vertically with an initial velocity
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 informationEnergy Conservation AP
Energy Conservation AP Manicouagan Reservoir seen from space shuttle; formed almost 1 million years ago when a large meteorite hit Earth Earth did work on meteorite to change its kinetic energy energy
More informationLINEAR KINETICS (PART 2): WORK, ENERGY, AND POWER Readings: McGinnis Chapter 4
LINEAR KINETICS (PART 2): WORK, ENERGY, AND POWER Readings: McGinnis Chapter 4 1 WORK: Another way of expressing the effect of a force. Mechanically, work is done on an object when a force causes a change
More information