Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

The table’s first column lists four examples of work carried out. The second column provides further detail about the action. Which row is incorrect?

  • Aa girl dives from a diving board into a swimming pool; work is done by the girl against gravity as she falls
  • Ba man pushes a car along a level road; work is done by the man against friction
  • Can electron is accelerated towards a positively-charged plate; work is done on the electron by the electric field of the plate
  • Da piston is pushed outwards as a gas expands; work is done on the atmosphere by the gas

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