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CAIE IGCSE Physics 1.7.1 Energy Question Bank

Practise naming energy stores, tracing transfers between them, and using conservation with kinetic and gravitational calculations.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • use conservation of energy to link GPE lost, KE gained and work done against friction
  • calculate kinetic energy with Ek = 1/2 mv^2 and give suitable J or kJ units

Covered syllabus points

1.7.1.1—Energy may be stored as kinetic1.7.1.2—Energy is transferred between stores1.7.1.3—Principle of the conservation of1.7.1.4—Kinetic energy: Ek = 1/2 mv^21.7.1.5—Recall/use: for the change in1.7.1.6—Principle of the conservation of

1.7.1 Energy question 1

[Maximum number: 1]

Fig. 2.1 shows solar-powered traffic warning lights.

Fig. 2.1

Fig. 2.1

The energy from the solar cell is stored in a battery.

Name the energy store in the battery.

1.7.1 Energy question 2

[Maximum number: 1]

Fig. 10.1 shows a lightning flash between a cloud and the ground beneath.

Fig. 10.1

Fig. 10.1

The charge built up on the cloud before the lightning flash is 0.60 C . This charge is completely transferred to the ground by the lightning flash in 5.0×10−5 s(0.000050 s)5.0 \times 10^{-5} \mathrm{~s}(0.000050 \mathrm{~s}).

Suggest what happens to the energy calculated in (b)(ii).

1.7.1 Energy question 3

[Maximum number: 5]

Question (a)

(a)

A hard ball is dropped vertically downwards.
Fig. 1.1 shows the speed-time graph for the ball from when it is dropped until it hits the ground.

Air resistance is ignored.

Fig. 1.1

Fig. 1.1

[ 3 ]

Question (i)

(i)

The mass of the ball is 0.54 kg . Calculate the gravitational potential energy stored in the ball immediately before it is dropped.
gravitational potential energy = [2]

[ 2 ]

Question (ii)

(ii)

Determine the kinetic energy of the ball when it has fallen half way to the ground.
kinetic energy =

[ 1 ]

Question (b)

(b)

A soft ball is dropped by a student so that it bounces on the ground.

Fig. 1.2 shows the height-time graph for the ball. The height is measured from the ground.
The ball bounces four times.

Fig. 1.2

Fig. 1.2

Explain why the change in height of the ball between B and C is less than the change in height between A and B.

[ 2 ]
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