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Published byPolly Greene Modified over 6 years ago

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CH. 4 Energy and a little bit of Ch. 5 4.1 The Nature of Energy 4.2 Conservation of Energy 5.1 Work

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4.1 What is energy? Motion needs ____________: Measured in ____________ Energy Types: electrical- _______- radiant-thermal- sound- nuclear – ________________

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Potential Energy __________ energy /no motion When a ________________ is pulled back it has ____________ energy ___________ potential energy food ____________ potential energy – Any type of stretched or compressed elastic material Clock ____________ Bungee cord

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Gravitational Potential Energy –Apple hanging from a tree –Depends on __________ of objects –Depends on __________ between objects –Grav.PE=mass x ___________ acceleration x height PE=mgh

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Kinetic Energy When the apple falls off the tree it has –___________ Energy Depends on ___________(v) Increase in speed results in _____________ ability to do work Kinetic energy =1/2 x ______(kg) x speed squared KE=1/2 m ___ 2

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4.2 Conservation of Energy Transforming energy: Light Bulb: ____________ Light thermal Gasoline: __________ kinetic motion electrical thermal sound _____________ Energy= potential + kinetic

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The Law of Conservation of Energy Energy cannot be created or destroyed, only transformed. Mechanical Energy= K.E. + P.E. K.E.=P.E.

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5.1 Work The measure of the _________ over the entire distance covered _____________ Force=Motion Motion=Distance covered Work= ________ x Distanc W= F x d –Joules (ENERGY!!)

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Power The measure at the rate at which work is done Power = _______/Time P=W/t –________/Seconds= Watts Power-___________

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