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Chapter 6 Practice Paper: Energy, Work and Power — question paper

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QQ/S3PH/CH6

Secondary 3 · Physics (G2 / G3)

Chapter 6 Practice Paper

Energy, Work and Power

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
  • Take the acceleration of free fall g as 10 m/s² unless stated otherwise.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Energy stores and transfers, kinetic and potential energy, work done, power, efficiency and energy resources.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which energy store is being emptied when a skydiver falls at terminal velocity?

    1. Akinetic, which keeps growing
    2. Bgravitational potential
    3. Cchemical in the air
    4. Dnuclear
    ( )
  2. 2

    A runner of mass 50 kg sprints at 4.0 m/s. Her kinetic energy is

    1. A100 J
    2. B200 J
    3. C400 J
    4. D800 J
    ( )
  3. 3

    A crate is dragged 8.0 m along a floor by a horizontal force of 250 N. The work done by the force is

    1. A31 J
    2. B258 J
    3. C2000 J
    4. D31 250 J
    ( )
  4. 4

    A motor transfers 500 J of energy and delivers 350 J usefully. Its efficiency is

    1. A30%
    2. B143%
    3. C350%
    4. D70%
    ( )
  5. 5

    Which statement about energy resources is correct?

    1. AWind power is non-renewable because the wind blows away
    2. BBurning fossil fuels transfers energy from a chemical store that took millions of years to form
    3. CSolar panels create energy from nothing
    4. DHydroelectric dams store nuclear energy
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A student of weight 480 N climbs a staircase of vertical height 3.5 m in 7.0 s. Take g = 10 N/kg.

    1. (a)

      Determine the useful work done against gravity.

      work =J[2]
    2. (b)

      Determine her useful power output.

      power =W[2]
    3. (c)

      Her body actually transfers about four times this much energy during the climb. State what happens to the rest.

      [2]
  2. 2

    A 0.50 kg ball is dropped from a balcony 20 m above the ground. Ignore air resistance and take g = 10 m/s².

    1. (a)

      Calculate the gravitational potential energy of the ball before release.

      Ep =J[2]
    2. (b)

      State the kinetic energy of the ball just before it hits the ground, with a reason.

      Ek =J[2]
    3. (c)

      Calculate the speed of the ball on impact.

      speed =m/s[2]
    4. (d)

      In practice the ball rebounds to a lower height. Describe the missing energy’s destination.

      [1]
  3. 3

    A small electric water pump lifts 150 kg of water through a vertical height of 8.0 m every minute. The pump draws 300 W of electrical power. Take g = 10 N/kg.

    1. (a)

      Calculate the useful work done lifting one minute’s worth of water.

      work =J[2]
    2. (b)

      Calculate the useful power output of the pump.

      power =W[2]
    3. (c)

      Calculate the efficiency of the pump.

      efficiency =[2]
    4. (d)

      State the main energy pathway of the wasted energy.

      [1]

— End of paper —