Energy, Work and Power

Energy is measured in (). It gives us the ability to do work. In physics work is done when energy is transferred. When an object is moved a distance against a force, work has been done to overcome that force.

If the force is greater, then the work done will be .

If the distance is further, then the work done will be .

Work Done = Energy transferred = Applied Force x distance moved in the direction of the force

This can be summarised in the following 'magic triangle':

Work done against frictional forces is mainly transformed into .

Power is the rate of energy transfer (or work done):

Power	=		=

Power is measured in (), equivalent to 1 Joule per second.