Work is done when a force moves.
Everyday examples of work include walking up a flight of stairs, lifting heavy objects, pulling a sledge and pushing a shopping trolley.
Work is not done when holding a bag stationary or a book at arm’s length because although a force is being applied, the force does not move.
Here is the equation that relates to work done, force applied, and distance moved in the direction of the force.
W is work done measured in joules, J
F is force measured in newtons, N
d is distance measured in metres, m
In the example above, 10 N is applied to move the box 2 m.
Work done W = Fd
F = 10 N
d = 2 m
Work done = 10 × 2 = 20 J
The work done pushing the box 2 m is 20 J.
Equations for calculating work
|F=||F = W ÷ d|
|d=||d = W ÷ F|