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Topic 2 Practice Paper: Forces — question paper

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QQ/IGCSE-PHYS/T2

IGCSE · Cambridge IGCSE Physics (Extended (Core + Supplement))

Topic 2 Practice Paper

Forces

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

  • Answer all questions.
  • Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
  • Section B contains structured questions. Write your answers in the spaces provided.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total mark for this paper is 30.

Original practice material written against the Cambridge IGCSE Physics syllabus. It is not an official Cambridge examination paper. Topic 2: Forces (effects of forces, springs, friction, moments, centre of gravity).

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

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

  1. 1

    A boat’s engine provides a driving force of 900 N and water drag is 900 N. The boat moves in a straight line at a steady speed. The resultant force on the boat is

    1. A1800 N forwards
    2. B900 N forwards
    3. Czero
    4. D900 N backwards
    ( )
  2. 2

    A resultant force gives a mass of 6.0 kg an acceleration of 5.0 m/s². What is the size of the resultant force?

    1. A1.2 N
    2. B36 N
    3. C0.20 N
    4. D30 N
    ( )
  3. 3

    A load of 4.0 N stretches a spring by 16 mm on the straight part of its load–extension graph. What is the spring constant?

    1. A0.25 N/m
    2. B64 N/m
    3. C4.0 N/m
    4. D250 N/m
    ( )
  4. 4

    Beyond the limit of proportionality, a stretched spring

    1. Asnaps immediately
    2. Bcontracts back to its original length on its own
    3. Cno longer has extension proportional to the load
    4. Dhas zero extension for every load
    ( )
  5. 5

    Which force is an example of drag?

    1. AThe pull of a rope on a sledge
    2. BAir resistance on a falling leaf
    3. CThe push of a hand on a door
    4. DThe weight of a swimmer
    ( )
  6. 6

    A force of 8.0 N acts 0.50 m from a pivot. The moment of the force about the pivot is

    1. A16 N m
    2. B4.0 N m
    3. C8.5 N m
    4. D0.063 N m
    ( )
  7. 7

    A seesaw is pivoted at its centre. A 25 N child sits 1.6 m from the pivot. At what distance from the pivot must a 40 N child sit to balance it?

    1. A1.0 m
    2. B2.6 m
    3. C0.64 m
    4. D1.6 m
    ( )
  8. 8

    A rigid body is in equilibrium. Which statement must be true?

    1. AThe body is always stationary
    2. BOnly gravity acts on the body
    3. CThere is no resultant force and no resultant moment on the body
    4. DAll forces on the body act at one point
    ( )
  9. 9

    A flat card hangs freely from a pin. It settles so that its centre of gravity is

    1. Adirectly above the pin
    2. Bdirectly below the pin
    3. Cat the geometric centre of the card, wherever that is
    4. Das far from the pin as possible
    ( )
  10. 10

    A uniform metre rule is pivoted freely at its midpoint. Where is the rule’s centre of gravity?

    1. AAt the 50 cm mark
    2. BAt the 0 cm mark
    3. CAt the 100 cm mark
    4. DA rule has no centre of gravity
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 11

    A student investigates a spring. The unstretched spring is 84 mm long. Loads are added and the lengths recorded: 2.0 N → 90 mm, 4.0 N → 96 mm, 6.0 N → 102 mm.

    1. (a)

      Complete a table showing the extension for each load.

      [2]
    2. (b)

      Describe the relationship between load and extension shown by these results.

      [1]
    3. (c)

      Calculate the spring constant of the spring, in N/m.

      [2]
    4. (d)

      The spring is loaded until its graph starts to curve. Name this point.

      [1]
  2. 12

    A sledge of mass 18 kg is pulled along flat ground by a rope with a horizontal pull of 50 N. Friction between the sledge and the snow is 14 N.

    1. (a)

      Calculate the resultant horizontal force on the sledge.

      [1]
    2. (b)

      Calculate the acceleration of the sledge.

      [2]
    3. (c)

      The rope snaps and the sledge slides on. Explain what happens to its motion, assuming the snow still pushes back with 14 N.

      [2]
    4. (d)

      State one effect of friction between the sledge and the snow besides changing the motion.

      [1]
  3. 13

    A uniform metre rule is pivoted at its centre. A 5.0 N weight hangs at the 30 cm mark and an unknown weight hangs at the 75 cm mark, keeping the rule horizontal.

    1. (a)

      State the distance of each weight from the pivot.

      [1]
    2. (b)

      Calculate the unknown weight.

      [2]
    3. (c)

      A second 5.0 N weight is now hung at the 40 cm mark on the same side as the first. Explain, without calculation, what happens to the rule.

      [2]
  4. 14

    A floor-standing lamp has a heavy circular base and a tall thin stem. A student suggests replacing the heavy base with a light one of the same radius.

    1. (a)

      State what happens to the position of the lamp’s centre of gravity.

      [1]
    2. (b)

      Explain why the lighter base makes the lamp easier to topple.

      [2]

— End of paper —