Chapter 05b - Chapter 5B Kinetic Energy and Potential...

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Chapter 5B 1 Kinetic Energy and Potential Energy Objects have kinetic energy when they are moving: Objects can have potential energy due to their position: They can have both forms of energy at the same time. KE = 1 2 mv 2 PE = mgy
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Chapter 5B 2 When Gravity is the Only Force . .. What happens when we drop something, and gravity is the only force doing work on it? W net = 1 2 mv f 2 - 1 2 mv i 2 W net = ∆ KE mg When work is done by a net force the object’s kinetic energy changes:
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Chapter 5B 3 When Gravity is the Only Force . .. When gravity does work on something its potential energy changes: W net = W grav KE = -∆ PE KE + PE = 0 W grav = mgy i - mgy f W grav = -∆ PE When gravity is the only force doing work these work terms will be equal:
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Chapter 5B 4 When Gravity is the Only Force . .. So when gravity is the only force doing work on something, the sum of its KE and PE remains constant: This applies to objects on inclines as well as to freely falling objects. (The normal force does no work.) KE + ∆ PE = 0
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Chapter 05b - Chapter 5B Kinetic Energy and Potential...

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