Chapter 11 Practice Paper: Work, elasticity and power — question paper (print)

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QQ/GCSE-PHYS/CH11

GCSE (9–1) · GCSE Physics (Foundation and Higher)

Chapter 11 Practice Paper

Work, elasticity and power

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

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.
You may use a calculator.
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 for the MOE GCSE Physics syllabus. It is not an official MOE or school examination paper. Chapter 11: work done W = F s, power P = W/t, Hooke’s law F = k e, the force–extension required practical, and elastic potential energy ½ k e² (Higher).

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
The energy transferred when a force moves an object along the line of action of the force is called
1. Apower
2. Bwork done
3. Cmomentum
4. Dcurrent
( )
2
A kettle transfers 36 000 J to its element in 30 s. The kettle’s power is
1. A1 080 W
2. B36 030 W
3. C1 200 W
4. D0.0012 W
( )
3
A trolley is pushed 2.5 m by a steady force of 80 N. The work done is
1. A200 J
2. B32 J
3. C82.5 J
4. D0.031 J
( )
4
The spring constant k is measured in
1. AN m
2. BN/m²
3. Cm/N
4. DN/m
( )
5
A force of 6.0 N stretches a spring 0.030 m. The spring constant is
1. A180 N/m
2. B0.005 N/m
3. C200 N/m
4. D20 N/m
( )
6
Beyond the limit of proportionality, a spring stretched further will
1. Akeep obeying F = k e exactly
2. Bno longer have extension proportional to force
3. Close its spring constant
4. Dshrink back shorter than before
( )
7
A spring with k = 100 N/m stores elastic energy when stretched 0.20 m. The energy stored is
1. A20 J
2. B10 J
3. C40 J
4. D2.0 J
( )
8
An electric drill transfers 1 200 J in 20 s. Its power is
1. A60 W
2. B24 W
3. C0.017 W
4. D1 220 W
( )
9
Which deformation leaves the object unchanged after the force is removed?
1. Ainelastic
2. Bplastic
3. Cpermanent
4. Delastic
( )
10
Stretching a spring to three times its extension (in the Hooke region) stores
1. Athe same energy
2. B3 times the energy
3. C9 times the energy
4. D27 times the energy
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

11
A warehouse worker drags a pallet a horizontal distance of 4.0 m, exerting a steady force of 250 N. The move takes 8.0 s.
1. (a)
  Calculate the work done by the worker.
  [3]
2. (b)
  Calculate the worker’s power output.
  [2]
3. (c)
  The pallet’s kinetic store does not end up 1 000 J larger. Explain what happened to most of the energy.
  [2]
12
A student investigates a spring: loads of 1.0 N, 2.0 N and 3.0 N produce extensions of 0.020 m, 0.040 m and 0.060 m.
1. (a)
  Describe how the extension for the 2.0 N load would be measured.
  [2]
2. (b)
  Show that the data are consistent with Hooke’s law and calculate the spring constant.
  [3]
3. (c)
  Calculate the elastic energy stored when the spring is stretched 0.050 m (within the linear region).
  [2]
13
A lift system raises a 60 kg passenger 3.0 m at constant speed in 4.0 s (g = 9.8 N/kg).
1. (a)
  Calculate the weight of the passenger.
  [2]
2. (b)
  Calculate the work done raising the passenger at constant speed.
  [2]
3. (c)
  Calculate the useful power, and explain why the motor’s total power draw is larger.
  [2]

— End of paper —