Work and Power Flashcards
1
Q
Work done (Energy)
A
Work done = Energy transferred
2
Q
What does the amount of energy transferred depend on?
A
Amount of energy transferred by a force depends on two things :
➢ The size of the force - the greater the force, the more work it does
➢ The distance moved in the direction of the force - the further it moves the more work is done
3
Q
Work done Formula
A
Work done by a force = Force x distance moved by the force in the direction of the force
4
Q
What is Power?
A
The rate at which you do work
The more work you do , and the shorter the time in which you do it, the greater your power
5
Q
Power Formula
A
Power = Work done/Time taken
Unit of power = Watt (W)
6
Q
Efficiency Formula
A
Efficiency formula = (useful power output/power input) x 100%
