4.5.2.1 - Work done and energy transfer

When does a force do work on an object?

A force does work on an object when the force causes a displacement of the object

so if force causes an object to move = work is done on the object

When work is done, what happens to energy ?

When work is done by a force, energy is transferred from one store to another

So work done = energy transfer

Give the equation for work down.

Work done = force x distance (moved along the line of action)

W = Fs

Give the unit for all the components of the equation.

work done - in joules , J

Force - in newtons , N

distance - in metres , m

One joule of work is when…..

1 joule of work is when 1 newton of force causes a displacement of 1 metre

How many newton-metres is one joule?

1 joule = 1 newton-metre

What does work done cause a rise in temperature of the object?

When work is done against the frictional forces acting on an objects, it causes a rise in the temperature of the object