Energy - Copyright © by Holt Rinehart and Winston All...

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Unformatted text preview: Copyright © by Holt, Rinehart and Winston. All rights reserved. Objectives Identify several forms of energy. Calculate kinetic energy for an object. Apply the work–kinetic energy theorem to solve problems. Distinguish between kinetic and potential energy. Classify different types of potential energy. Calculate the potential energy associated with an object’s position. Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy By what factor does the kinetic energy of a car change when its speed is tripled? 1. no change at all 2. factor of 3 3. factor of 6 4. factor of 9 5. factor of 12 Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy By what factor does the kinetic energy of a car change when its speed is tripled? 1. no change at all 2. factor of 3 3. factor of 6 4. factor of 9 5. factor of 12 Since the kinetic energy is 1/2 1/2 mv mv 2 , if the speed increases by a speed increases by a factor of 3 factor of 3 , then the KE will increase by a factor of 9 KE will increase by a factor of 9 . Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy (2) Is it possible for the kinetic energy of an object to be negative? 1. yes 2. no Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy (2) Is it possible for the kinetic energy of an object to be negative? 1. yes 2. no The kinetic energy is kinetic energy is 1/2 mv 1/2 mv 2 . The mass mass and the velocity squared velocity squared will always be positive positive , so KE must always be positive KE must always be positive . Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy (3) Car #1 has twice the mass of car #2, but they both have the same kinetic energy. How do their speeds compare? 1. 2 v 1 = v 2 2. √ 2 v 1 = v 2 3. 4 v 1 = v 2 4. v 1 = v 2 5. 8 v 1 = v 2 Copyright © by Holt, Rinehart and Winston. All rights reserved. Concept Check – Kinetic Energy (3) Car #1 has twice the mass of car #2, but they both have the same kinetic energy. How do their speeds compare? 1. 2 v 1 = v 2 Copyright © by Holt, Rinehart and Winston. All rights reserved. Kinetic Energy Kinetic energy depends on speed and mass. ( 29 2 2 1 2 1 kinetic energy = mass speed 2 KE mv = × × Copyright © by Holt, Rinehart and Winston. All rights reserved. 2 1 2 KE mv = ( 29 2 m kg s KE = 2 2 kg m s KE ⋅ = 2 2 m kg m 1 N 1 kg 1 = 1 s s ⋅ ≡ g 2 kg m s KE m ⋅ = N m KE = ⋅ 1 J 1 N m ≡ ⋅ J = Kinetic Energy (Units) Copyright © by Holt, Rinehart and Winston. All rights reserved....
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This note was uploaded on 04/12/2011 for the course PHYS 1310 taught by Professor Staff during the Spring '11 term at North Texas.

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Energy - Copyright © by Holt Rinehart and Winston All...

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