How are work and power related?

done is a measure of the transferred when a force moves a load, is the rate of energy transfer.

They both involve energy transfer.

Work done IS the energy transferred when a force moves a load Work done = force distance moved in direction of force. Work has units of Joules

Power is the rate of energy transfer Power = energy /time

Where they might both be used is when calculating the power of a machine,

Power of machine = work done / time taken

Remember, work done is the energy transferred, so these terms are interchangeable in the power equation.

Example - a person lifts a 10 kg mass, moving it a distance of 1.5m, in 2 seconds. Calculate the persons power output:

Take ##g = 10N/kg##

Weight = ##mg## = ##10 *10## =##100N##

Work = ##100N * 1.5m## = ##150J##

Power = ##150J/2s## = ##75W##