CourseCourseConceptConceptDocumentDocument

CAIE A-Level Physics AS 5 Work Energy and Power Questions

Practise analysing work, energy transfers, efficiency and power, applying gravitational and kinetic energy relationships and using P = W/t or P = Fv.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • calculate work and track energy transfers using work, conservation of energy, efficiency and power
  • derive and apply gravitational potential and kinetic energy relationships in changing-motion problems
  • use P = W/t and P = Fv to analyse rates of energy transfer and mechanical performance

Covered syllabus points

5.1 Energy conservation5.2 Gravitational potential energy and kinetic energy

Question 1

[Maximum number: 1]

A box of weight 40 N is pushed with a horizontal force of 20 N along level ground for a distance of 2.4 m .

The box is then lifted at constant velocity through a height of 1.6 m by a vertical force.
What is the total work done on the box by the two forces?

A

80 J

B

110J

C

120 J

D

160 J

Question 2

[Maximum number: 1]

The change in gravitational potential energy ΔE\Delta E of an object of mass m when moving through height Δh\Delta h near the surface of the Earth is given by the equation shown.

ΔE=mgΔh\Delta E=m g \Delta h

Which equation is needed as part of the derivation of this expression?

A

kinetic energy =12×=\frac{1}{2} \times mass ×( speed )2\times(\text { speed })^{2}

B

moment = force × distance

C

weight = mass × acceleration of free fall

D

work done = power × time

Question 3

[Maximum number: 1]

A block of mass 2.0 kg is released from rest on a slope. It travels 7.0 m down the slope and falls a vertical distance of 3.0 m . The block experiences a frictional force parallel to the slope of 5.0 N .

Figure for Question 3 — CAIE A-Level Physics AS

What is the speed of the block after falling this distance?

A

4.9 m s−14.9 \mathrm{~m} \mathrm{~s}^{-1}

B

6.6 m s−16.6 \mathrm{~m} \mathrm{~s}^{-1}

C

8.6 m s−18.6 \mathrm{~m} \mathrm{~s}^{-1}

D

10 m s−110 \mathrm{~m} \mathrm{~s}^{-1}

Question 4

[Maximum number: 1]

An object is in a uniform gravitational field. The graph shows how the change in gravitational

potential energy ΔEP\Delta E_{\mathrm{P}} of the object varies with the vertical distance x moved by the object from a

fixed point.

Figure for Question 4 — CAIE A-Level Physics AS

Which graph shows how the gravitational force F acting on the object varies with distance x ?

A

A

B

B

Figure for Question 4 — CAIE A-Level Physics AS
D

D

A
Option A shown in diagram

Option A shown in diagram

B
Option B shown in diagram

Option B shown in diagram

C
Option C shown in diagram

Option C shown in diagram

D
Option D shown in diagram

Option D shown in diagram

All question bank results loaded