GCSE Physics  ›  P.5.2 Work done and energy transfer

Work done and energy transfer

Free AQA GCSE Physics practice questions on Work done and energy transfer. Sample questions below with detailed mark schemes — sign up to practise the full set with spaced repetition.

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Describe — 4 marks

A student pushes a heavy box across a classroom floor. The box moves in the direction of the applied force, and the student notices the box becomes slightly warm after being pushed.

  1. Describe what is meant by work done on an object. [1 mark]
  2. Describe how energy is transferred when the student pushes the box across the floor. [2 marks]
  3. Describe why the box becomes warm during this process and identify the form of energy responsible for this temperature increase. [1 mark]
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Show — 3 marks

A student pushes a crate across a horizontal floor with a constant force of 45 N. The crate moves a distance of 8 m in the direction of the force. The student wants to calculate the work done on the crate.

  1. Show that the work done on the crate is 360 J. [2 marks]
  2. Explain what happens to the energy transferred to the crate if the student pushes with the same force but the crate only moves 4 m. [1 mark]
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Evaluate — 5 marks

A student designs an experiment to investigate energy transfer in a pulley system. A 2 kg mass is lifted vertically upwards through a height of 3 m using a rope over a pulley. The student measures that a force of 25 N is required to lift the mass at a constant velocity. The student then calculates the work done by the applied force and compares it to the gravitational potential energy gained by the mass. (Use g = 10 m/s²)

  1. Calculate the work done by the applied force when lifting the mass through 3 m. [1 mark]
  2. Calculate the gravitational potential energy gained by the mass. [1 mark]
  3. The work done by the applied force is greater than the gravitational potential energy gained. Evaluate why this difference exists and what it tells us about the efficiency of the pulley system. [3 marks]
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