P2.1.5 - AQA GCSE Physics Unit 2

P2.1.5	Forces and elasticity
	a) A force acting on an object may cause a change in shape of the object.
	b) A force applied to an elastic object such as a spring will result in the object stretching and storing elastic potential energy.	Calculation of the energy stored when stretching an elastic material is not required.
	c) For an object that is able to recover its original shape, elastic potential energy is stored in the object when work is done on the object to change its shape.
	d) The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded: F = k x e	see Hooke's Law F is the force in newtons, N k is the spring constant in newtons per metre, N/m e is the extension in metres, m