Using machines.

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Presentation transcript:

Using machines

Compound machine- a machine made up of 2 or more simple machines. Ex: an axe = wedge and lever

What simple machines make up these compound machines?

Efficiency- a measure of how much work put into a machine is changed to useful work. Efficiency = W out / W in X 100 *Efficiency will be a percentage*

Power- rate at which work is done Power- rate at which work is done. Measure of amount of work done in a certain amount of time.

Power Equation Variable Ending Units Power = P Watts (W) Work = W Joules (J) Time = t seconds (s)

W = P x t P = W / t t = W / P W . . P t x

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