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physics_chapter7notes

# physics_chapter7notes - Chapter 7 Potential Energy and...

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Unformatted text preview: Chapter 7: Potential Energy and Energy Conservation 7.1 Gravitational Potential Energy A particle gains or loses kinetic energy because it interacts with other objects that exert forces on it. During any interaction, the change in a particle's kinetic energy is equal to the total work done on the particle by the forces that act on it. Potential energy – the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass) • Gravitational potential energy – potential energy associated with a body's weight and its height above the ground o When a body falls without air resistance: Gravitational potential energy decreases and the falling body's kinetic energy increases Kinetic energy increases because the force of the earth's gravity (the body's weight) does work on the body = PEgrav mgh Conse rv a t ion of Mech a n ic a l E ne rgy (G r av i t a t ion a l Fo rces...
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physics_chapter7notes - Chapter 7 Potential Energy and...

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