Potential and Kinetic Energy. What is energy?! Capacity to do work Measured in joules (J)

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Presentation transcript:

Potential and Kinetic Energy

What is energy?! Capacity to do work Measured in joules (J)

Potential Energy Energy stored in an object – Dependent upon: Position – top of a hill vs bottom of a hill Shape - stretched rubber band, compressed spring Condition – old battery vs new battery Commonly used as fuel to “run” things Ex: batteries, gasoline/fuel, food, object at the top of a hill, acorn hanging on a tree, etc.

Types of PE Chemical (food, gasoline, other fuels) Nuclear (fission, fusion) Gravitational (one object above another) Stored mechanical (elastic PE)

Kinetic Energy Energy of an object due to its motion. – Dependent upon: Mass – bowling ball vs a marble Speed – car traveling at 75mph vs 25 mph Ex: person running, Frisbee flying, baseball moving through air, car traveling down road

Forms of KE Sound – travels in waves, must have something to travel through Radiant – travels in waves, doesn’t have to have a medium Electrical – when e- move (lightning, electricity)

Law of Conservation of Energy Energy can be neither created, not destroyed BUT can change from one form to another. (Amount of energy in a system remains constant!) KE can change to PE, or vice versa! Energy can be transferred as work and heat  thermodynamics

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