# 4.3.5.2

4.5.2 Work done and energy transfer

# 4.5.2 Work done and energy transfer

## Content

When a force causes an object to move through a distance work is done on the object. So a force does work on an object when the force causes a displacement of the object.

The work done by a force on an object can be calculated using the equation:

work done = force × distance moved along the line of action of the forceW =Fs

work done, W, in joules, J force, F, in newtons, N

distance, s, in metres, m

One joule of work is done when a force of one newton causes a

displacement of one metre. 1 joule = 1 newton-metre

Students should be able to describe the energy transfer involved when work is done.

Students should be able to convert between newton-metres and joules.

Work done against the frictional forces acting on an object causes a rise in the temperature of the object.

WS 4.5 - Interconvert units.

MS 3b Change the subject of an equation

MS 3c Substitute numerical values into algebraic equations using appropriate units for physical quantities

MS 1c - Use ratios, fractions and percentages

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