AQA GCSE Physics

Revision Notes

5.2.3 Work Done & Friction

Work & Friction

  • Friction is a force that works in opposition to the motion of an object
    • This slows down the motion of the object
  • When friction is present, energy is transferred in the form of heat
    • This raises the temperature (thermal energy) of the object and its surroundings
    • The work done against the frictional forces causes this rise in the temperature
  • Imperfections at the interface between the object and the surface bump into and rub up against each other
    • Not only does this slow the object down but also causes an increase in thermal energy

Friction, IGCSE & GCSE Physics revision notes

The interface between the ground and the sledge is bumpy which is the source of the frictional force

Air Resistance

  • Air resistance is a type of friction that slows the motion of an object
  • Particles bump into the object as it moves through the air
    • As a result, the object heats up due to the work done against the frictional forces

Work Air Resistance, downloadable IGCSE & GCSE Physics revision notes

The return module of a rocket heats up due to the work done by air resistance as it travels a distance through the atmosphere

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