Energy AP

# Energy AP - Work Energy and Power Work Work is the product...

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Work, Energy, and Power

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Work Work is the product of the magnitude of the displacement and the component of the force acting in the direction of the displacement θ cos ) cos ( product) (dot Fd W s F W s F W = = =
Work Most of the time F is in the direction of d so θ = 0° and cos 0° = 1 so… Work is done by a force acting on a body! Fd W = max

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Work Symbol: W Unit : J, joule 1 J = 1 Nm If force and displacement are in the… Same directions, + W Opposite directions, - W Perpendicular directions, W = 0

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Work Work generally falls into 2 categories: 1. When you force something to move against the influence of an opposing force (push-ups & gravitational force, walking 2. When you change the speed of something A net force is present
Total work causes a change in speed – F constant ( 29 K W mv mv v v m s F s v v m F s v v a ma F net net net net = - = - = - = - = = 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 2 2 1 2 1 2 2 2

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Kinetic Energy Equation 2 2 1 mv K =
Work – Energy Theorem or work done by a net force or net work done on an object K d F W net net = =

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Energy AP - Work Energy and Power Work Work is the product...

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