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Chapter 3 Practice Paper: Force and Pressure — question paper

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

Chapter 3 Practice Paper

Force and Pressure

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 3 (contact and non-contact forces, mass vs weight with W = mg, density = m/V, pressure = F/A).

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 force is non-contact?

    1. Afriction slowing a sledge
    2. Btension in a skipping rope
    3. Cgravity pulling rain down
    4. Dair resistance on a kite
    ( )
  2. 2

    A 6.0 kg suitcase is lifted onto a rack (g = 10 N/kg). The force needed to hold it steady is

    1. A0.60 N
    2. B6.0 N
    3. C60 N
    4. D600 N
    ( )
  3. 3

    An object of mass 240 g has volume 80 cm³. Its density is

    1. A0.33 g/cm³
    2. B3.0 g/cm³
    3. C19 200 g/cm³
    4. D320 g/cm³
    ( )
  4. 4

    A 400 N box rests on a floor area of 0.080 m². The pressure on the floor is

    1. A32 Pa
    2. B500 Pa
    3. C32 000 Pa
    4. D5000 Pa
    ( )
  5. 5

    Why do the wide tyres of a tractor suit soft ground?

    1. Athey increase the tractor's weight
    2. Bthey increase contact area, reducing pressure
    3. Cthey reduce friction to zero
    4. Dthey increase the ground's density
    ( )

Section B: Structured questions[20 marks]

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

  1. 1

    A crane lifts a steel girder of mass 800 kg (g = 10 N/kg).

    1. (a)

      Calculate the girder's weight.

      weight =N[2]
    2. (b)

      State the girder's mass on the Moon, with a reason.

      [2]
    3. (c)

      The crane's steel cable stretches as it lifts. Name the force transmitted by the cable.

      [2]
  2. 2

    A glass ornament has mass 390 g and volume 150 cm³.

    1. (a)

      Calculate the ornament's density in g/cm³.

      density =g/cm³[2]
    2. (b)

      Convert the density to kg/m³.

      [1]
    3. (c)

      Determine, with a reason, whether the ornament floats in a tank of liquid of density 3100 kg/m³.

      [2]
    4. (d)

      State one assumption made when comparing densities to decide floating.

      [2]
  3. 3

    A rectangular packing case of mass 45 kg stands on a base of 1.5 m × 0.60 m (g = 10 N/kg).

    1. (a)

      Calculate the weight of the case.

      [1]
    2. (b)

      Calculate the area of the base in m².

      [1]
    3. (c)

      Calculate the pressure the case exerts on the floor.

      pressure =Pa[2]
    4. (d)

      The case is stood on its smaller end face of 0.30 m². State and calculate the new pressure, and explain the change.

      [3]

— End of paper —