Work, Energy and Power

Question	Answer
Law of conservation of energy	Energy can neither be created or destroyed, but can change form. The total energy in any closed system is constant.
Work Done	Work done by a force : The product of a force and displacement in the direction of the force. Work done by an expanding gas : Work done= pressure.change in volume.
Deriving kinetic energy	Image: 3248be14-ddb9-4062-94c7-3f40f4ab3707 (image/png)
G.P.E and E.P	Gravitational potential energy : energy possessed by an object due to its position. Elastic potential energy : possessed by an object due to its state of deformation. Electric potential energy : associated with the interaction between bodies due to their electric charge.
Deriving Gravitational Potential Energy	Image: 32ec1e08-25ca-4d2b-a003-2b88919a1742 (image/png)
Power	Power : work done per unit of time. Power= work done / time taken
Deriving power	Image: dffbb6f2-409f-4b1a-8eeb-19189f03849f (image/png)
Efficiency	Ratio of (useful) output of energy of a machine to the input energy efficiency=(Useful energy output/Total energy input) * 100
Sources:	Znotes.org and OALevelnotes.com

Resource summary

	Created by Hochel Brown about 10 years ago