1.3.1 Energy

1.3.2 Work

Work done is de ned as the force multiplied by the distance moved in the direction of the force, with formulae:

Work done = Force×distance moved in the direction of the force

W = F ×x

(J) = (N)(m)

Please note that this is not in the formula booklet.

W = Fxcosθ

(J) = (N)(m)

This however, is. And work done is equal to the change in energy:

1.3.3 Hooke’s Law

Hooke’s Law states that the load applied to an object is directly proportional to the extension, provided that the elastic limit is not reached, and as such:

where k is the spring constant The force and extension can be used to nd the elastic potential energy gained:

1.3.4 E ciency

E ciency is de ned as the amount of useful energy obtained per energy input, with formula: