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Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter

Work and Power

58 practice questions

Start practising (26 questions)

Topics covered

Practice questions

21–26 of 26 · Easy

  1. Question 21

    2 marks · Easy

    A boy pushes a trolley with a force of 50 N for a distance of 4 m. Calculate the work done by the boy on the trolley.

    Answer and see the solution →

  2. Question 22

    2 marks · Easy

    Describe what is meant by the conservation of energy, using a bouncing ball as an example.

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  3. Question 23

    4 marks · Easy

    A worker pushes a trolley with a constant force of for a distance of along a straight corridor. The trolley and its load have a combined mass of .

    (a)

    Calculate the work done on the trolley by the worker.

    [2 marks]
    (b)

    State the energy store that increases as a result of this work being done.

    [1 mark]
    (c)

    If the work is done in 12 seconds, calculate the power developed by the worker.

    [1 mark]
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  4. Question 24

    5 marks · Easy

    A box of mass is lifted from the ground onto a platform high. It is then pushed horizontally for along the platform with a force of .

    (a)

    Calculate the work done to lift the box onto the platform.

    [2 marks]
    (b)

    Calculate the increase in gravitational potential energy (GPE) of the box after lifting.

    [1 mark]
    (c)

    Calculate the work done in moving the box horizontally on the platform.

    [1 mark]
    (d)

    Name the type of energy store that increases as the box is pushed along the platform.

    [1 mark]
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  5. Question 25

    4 marks · Easy

    A cyclist with mass is riding at a speed of . The cyclist and bicycle come to rest after applying the brakes, stopping over a distance of .

    (a)

    Calculate the initial kinetic energy of the cyclist and bicycle.

    [2 marks]
    (b)

    State what happens to this kinetic energy as the cyclist comes to rest.

    [1 mark]
    (c)

    Calculate the average braking force exerted on the cyclist and bicycle to bring them to rest.

    [1 mark]
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  6. Question 26

    4 marks · Easy

    A small elevator with total weight rises vertically in at a constant speed.

    (a)

    Calculate the work done by the elevator motor to raise the elevator.

    [1 mark]
    (b)

    State the increase in gravitational potential energy (GPE) of the elevator.

    [1 mark]
    (c)

    Calculate the power output of the elevator motor during the lift.

    [2 marks]
    Answer and see the solution →