Work and Energy m m.

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Presentation transcript:

Work and Energy m m

Work Done by a Constant Force Work = Fd cos(q)

Work F q Fcos(q) d Work = Fd cos(q)

Units of Work System Unit of Work SI newton-meter Joule (J) cgs dyne-centimeter erg British foot-pound

A net force acts on a moving object vf vi Work Energy Theorem A net force acts on a moving object vf vi Kinetic Energy F m x

vf vi F m x Work Energy Theorem The net work done on an object by a net force acting on it is equal to the change in kinetic energy of the object

Work done against friction Friction acts on moving object m m f d

Stretching a Spring

x F F x kx Work

Object falls in a gravitational field Work done by gravity Object falls in a gravitational field m mg h m Wg = mgh

Work and Energy Work done by force (F) = Kinetic energy = Work done by gravity = Work done by a spring = Work done against friction =

Gravity/Kinetic Energy Ball drooped from rest h v

Spring/Kinetic Energy Work done by a spring v m m k x

Spring/Friction Work done by friction v = 0 m m k x d = ?

Gravity/Kinetic Energy m d vo = 0 V = ? q h h = d sin(q)

END ?

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