Work and Heat Topic Test (40 marks, 40 minutes)
1. For each of the following situations, state whether work is being done, and explain your answer
a. A man is sitting on a bench.
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b. A strongman is pulling a lorry.
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c. A space shuttle is moving at a constant speed through deep space.
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[6 marks]
2. State the equation relating work done, distance moved, and force applied.
(1 mark)
3. A builder pushes a wheelbarrow full of bricks a distance of 50m by applying a forwards force of 200N. How
much work is done? You must show all your working and state the correct units for full marks.
(3 marks)
4. A pair of oven gloves do not allow heat to transfer easily through them. Select the right words to describe
their material:
Thermal Insulator Thermal Conductor (1 mark)
5. Why are cooking pans often made of metal?
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6. For each of the following examples of heat transfer, state whether heat is mostly transferred by conduction,
convection, or radiation:
a. Heat travelling from the Sun to earth.
b. The warmth of the sea at night creates a land breeze.
c. An fire causes air to rise up a chimney.
d. The metal chain on a swing in the park feels cold when you touch it. (4 marks)
7. Fill in the blanks in the quantities table below:
Quantity Symbol Unit Unit Symbol
Distance s metres
Time seconds s
Speed metres per m/s
second
Mass m Kg
Gravitational Field Newtons per N/kg
Strength kilogram
Weight
Area A metres squared m2
Stress σ Newtons per N/m2
metre squared
Pressure P Pascals
Charge Coulombs C
Current Amperes (Amps)
Voltage V V
Resistance R Ω
Energy Joules J
Work W
(17 marks)
8. Jeremy heated a beaker of ice water over a Bunsen, and recorded the temperature every minute for 10
minutes. Plot his results on a line graph. Make sure you:
a. Choose a scale for your axes that uses most of the space provided. (1)
b. Label the axes carefully, including units. (1)
c. Plot all the results below accurately. (3)
d. Put a ring around any anomalous results, and ignore them when drawing your line of best fit. (1)
e. Draw a smooth line of best fit, passing through as many points as possible. (1)
f. Draw your axes, points, and line of best fit using a sharp pencil. (1)
Time (minutes) Temperature (°C)
0 0
1 15
2 0
3 0
4 0
5 1
6 6
7 11
8 16
9 21
10 25
Extension Questions (10 marks, 10 minutes)
9. In question 9, Jeremy heated the beaker of ice water for 5 minutes before the temperature increased. If the
heat energy didn’t cause the contents of the beaker to rise in temperature during that time, what effect do
you think it did have?
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(1 mark)
10. The Iditarod trail dog sled race covers a total distance of 1,510km. During a 100m stretch, the dogs together
do 13200J of work. What force do they exert on the sled?
(3 marks)
11. A crane lifts a 150kg pallet of building materials a distance of 25m. In this question, please take g to be
10N/kg.
a. What is the equation relating weight, mass, and gravitational field strength?
(1 mark)
b. What is the weight of the pallet? (This is the force the crane must exert to lift the pallet.)
(2 marks)
c. How much work does the crane do on the pallet in lifting it through this distance?
(3 marks)
