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

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QQ/S3CPH/CH6

Secondary 3 · Combined Science (Physics) (G2 / G3)

Chapter 6 Practice Paper

Work, Energy and Power

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Physics) syllabus. It is not an official MOE or school examination paper. Chapter 6 (energy stores and the four transfer pathways, Ek = ½mv², Ep = mgh, conservation of energy, W = Fd, P = E/t).

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. Take g = 10 m/s².

  1. 1

    The SI unit of work done is

    1. Athe newton
    2. Bthe watt
    3. Cthe joule
    4. Dthe pascal
    ( )
  2. 2

    A car of mass 1000 kg moves at 10 m/s. Calculate its kinetic energy.

    1. A5 kJ
    2. B50 kJ
    3. C100 kJ
    4. D500 kJ
    ( )
  3. 3

    Water is heated on a gas stove. The energy transfer pathway from the flame to the water is

    1. Amechanical working
    2. Ban electric current
    3. Cwaves (radiation)
    4. Dheating
    ( )
  4. 4

    A 3.0 kg bag rests on a shelf 2.0 m above the floor. Its gravitational potential energy is

    1. A6.0 J
    2. B15 J
    3. C30 J
    4. D60 J
    ( )
  5. 5

    A lamp transfers 600 J of electrical energy to light and heat in 20 s. Its power is

    1. A0.033 W
    2. B30 W
    3. C600 W
    4. D12 000 W
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show all necessary working. Take g = 10 m/s².

  1. 1

    A child pulls a sledge 8.0 m across level snow with a horizontal force of 25 N. The pull takes 10 s.

    1. (a)

      Calculate the work done by the pulling force.

      work done =J[2]
    2. (b)

      Calculate the average power developed during the pull.

      power =W[2]
    3. (c)

      State where the transferred energy ends up.

      [2]
  2. 2

    A coconut of mass 0.80 kg falls from a branch 6.0 m above the ground.

    1. (a)

      Calculate the gravitational potential energy given up during the fall.

      energy =J[2]
    2. (b)

      Ignoring air resistance, calculate the coconut’s speed just before it hits the ground.

      speed =m/s[3]
    3. (c)

      In reality some energy is transferred to the surrounding air as it warms. State and explain the effect on the actual landing speed.

      [2]
  3. 3

    A trolley of mass 2.0 kg is released from rest at the top of a ramp 0.80 m high. At the bottom its speed is measured as 3.6 m/s.

    1. (a)

      Calculate the gravitational potential energy the trolley loses in descending the ramp.

      energy =J[2]
    2. (b)

      Ignoring friction, calculate the speed the trolley would have at the bottom.

      speed =m/s[2]
    3. (c)

      Calculate the trolley’s actual kinetic energy at the bottom, and the energy that has been transferred to thermal stores. Explain why it is transferred there.

      [3]

— End of paper —