CALCULUS HOME SCHOOLING – BSD
UNIT TEST 4 (2023 - 2024)
iGCSE - PHYSICS
Name : ______________________________ Result : ________
Date : ______________________________ Remarks : ________
1. The diagram shows a ball at the bottom of a ramp. The ball moves up the ramp with an initial
speed v.
(a) State the formula linking gravitational potential energy (GPE), mass, gravitational filed
strength (g) and height.
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(b) The ball has a mass of 14 g.
Show that when the ball reaches a height of 29 cm above the bottom of the ramp, the GPE
gained by the ball is about 4 x 10-2 J.
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(c) At the bottom of the ramp, the 14 g ball has a kinetic energy (KE) of 5.1 x 10 -2 J.
Calculate the speed of the ball at the bottom of the ramp.
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(d) The ball is stationary when it reaches the top of the ramp. There is a difference between the
KE of the ball at the bottom of the ramp and the GPE of the ball at a height of 29 cm above
the bottom of the ramp.
Explain why the work done by friction between the ball and the ramp is equal to this
difference.
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2. (a) The boxes give some situations and some energy stores.
Draw one straight line from each situation to the energy store that decreases for that
situation.
The first one has been done for you. .................................................................. [4]
(b) Energy in transferred when a filament lamp is connected to a battery.
(i) Which method of energy transfer takes place between the battery and the lamp? [1]
a. Electrical
b. Heating
c. Mechanical
d. Radiation
(ii) Which method of energy transfer takes place between the lamp and the surroundings?[1]
a. Electrical
b. Light radiation
c. Mechanical
d. Sound radiation
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3. A racing car uses an engine and an electric motor to power its wheels.
The electric motor can only operate at maximum power for part each lap of the race.
The electric motor has a maximum power output of 1.2 x 10 4 W.
The electric motor transfers 4.0 x 106 J energy when it operates at maximum power.
Calculate the amount of time the electric motor can operate at maximum power.
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4. The photographs show two large-scale electrical production methods.
• A hydroelectric power (HEP) station
• A wind farm
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(a) Discuss the advantages and disadvantages of using hydroelectric power stations compared
with wind farm for large-scale electricity production.
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(b) Describe the energy transfers that are involved in generating electricity in a hydroelectric
power station.
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5. Funcube-1 is a satellite that was launched into orbit around the Earth.
(a) The rocket carrying Funcube-1 burns fuel to accelerate upwards.
As the rocket burns fuel, the energy in its chemical store reduces and the energy in its
kinetic store and gravitational store changes.
(i) State how the kinetic store pf the rocket changes as the rocket burns fuel.
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(ii) State how the gravitational store of the rocket changes as the rocket burns fuel.
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(b) The rocket engine stops burning fuel.
The rocket continues to go further away from the surface of the Earth.
The table gives some statements about the rocket’s energy stores.
Add ticks (√) to the table to show which two statements are correct....................... [2]
6. The table lists four methods of generating electricity and four energy stores.
The energy store of the initial energy resource decreases when electricity is being generated.
(a) Complete the table by placing one tick (√) in each row to show which energy store
decreases. ........................................................................................................ [4]
(b) State which method of generating electricity in the table does not use a renewable energy
resource.
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7. The chart shows the efficiencies of different methods of generating electricity.
(a) The chart shows that geothermal power station has an efficiency of 15%.
Explain what is meant by an efficiency of 15%.
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(b) A small hydroelectric power station has a useful energy output of 6.0 kJ.
Calculate the total energy input for this power station using information from the chart.
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Total Marks [40]
CLSBSD/iGCSE/UT4/102023 6
CLSBSD/iGCSE/UT4/102023 7
