work done and energy transfer

• 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 can be calculated using the equation:

  work done = force × distance

  W = F s

  work done, W, in joules, J

  force, F, in newtons, N

  distance, s, in metres
• One joule of work is done when a force of one newton causes a

  displacement of one metre.


  1 joule = 1 newton-metre
• the energy transfer involved when work is done.

  a transfer of energy from one store to another.
• Work done against the frictional forces acting on an object

  causes a rise in the temperature of the object