CIE AS Physics (9702) exams from 2022

Revision Notes

5.1.1 Work & Energy

Work Done

  • In Physics, work is done when an object is moved over a distance by an external force applied in the direction of its displacement

 

Work done equation, downloadable AS & A Level Physics revision notes

 

  • In the diagram below, the man’s pushing force on the block is doing work as it is transferring energy to the block (increasing its kinetic energy)

Work done diagram, downloadable AS & A Level Physics revision notes

Work is done when a force is used to move an object over a distance

 

  • When work is done, energy is transferred from one object to another
  • Work done can be thought of as the amount of energy transferred, hence its units are in Joules (J)
  • Usually, if a force acts in the direction that an object is moving then the object will gain energy
  • If the force acts in the opposite direction to the movement then the object will lose energy

 

Worked example

Worked example - work done on barrel, downloadable AS & A Level Physics revision notes

Exam Tip

A common exam mistake is choosing the incorrect force which is not parallel to the direction of movement of an object. You may have to resolve the force vector to find the component that is parallel. The force does not have to be in the same direction as the movement, as shown in the worked example.

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