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Chapter 4 Practice Paper: Dynamics — question paper

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QQ/S3CPH/CH4

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

Chapter 4 Practice Paper

Dynamics

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 4 (balanced and unbalanced forces, free-body diagrams, resultant force = ma, friction).

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

    A box slides across a rough floor, slowing down. The resultant force on it is

    1. Azero
    2. Bforwards
    3. Cbackwards
    4. Dupwards
    ( )
  2. 2

    A crane lifts a piano upwards at constant speed. The upward force from the cable is

    1. Agreater than the piano’s weight
    2. Bequal to the piano’s weight
    3. Cless than the piano’s weight
    4. Dzero
    ( )
  3. 3

    The resultant force needed to give a 1500 kg van an acceleration of 2.0 m/s² is

    1. A750 N
    2. B1502 N
    3. C3000 N
    4. D30 000 N
    ( )
  4. 4

    A block is pulled right with 30 N while friction acts left with 30 N. The block

    1. Aaccelerates right
    2. Bmoves right at steady speed or stays at rest
    3. Caccelerates left
    4. Dmust be at rest
    ( )
  5. 5

    Which free-body-diagram arrow starts on the body and points downwards?

    1. Athe normal force
    2. Bfriction
    3. Ctension
    4. Dweight
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show all necessary working.

  1. 1

    A parachutist of mass 80 kg falls: first accelerating, then at a steady 12 m/s with the parachute open (g = 10 N/kg).

    1. (a)

      Calculate the parachutist)s weight.

      weight =N[2]
    2. (b)

      State the drag force on her when falling at the steady 12 m/s, and the resultant force.

      [2]
    3. (c)

      Earlier in the fall the drag is only 300 N. Calculate the resultant force and the acceleration at that moment.

      acceleration =m/s²[2]
  2. 2

    A supermarket trolley of mass 25 kg is pushed with a horizontal force of 40 N. Friction on the wheels totals 15 N.

    1. (a)

      Calculate the resultant horizontal force.

      resultant =N[2]
    2. (b)

      Calculate the acceleration of the trolley.

      acceleration =m/s²[2]
    3. (c)

      The trolley is released and slows to a stop. State which force(s) cause the slowing and describe the resultant while it slows.

      [3]
  3. 3

    This question is about a car’s drive.

    1. (a)

      Name the horizontal force that pushes a car forward, and state what exerts it.

      [2]
    2. (b)

      A car of mass 1000 kg has a drive force of 2500 N and total resistance of 1000 N. Calculate the acceleration.

      acceleration =m/s²[3]
    3. (c)

      State the resultant force on the car when it cruises at a steady 90 km/h, and what the drive force equals then.

      [2]

— End of paper —