AQA GCSE PHYSICS · PAPER 2 · FOUNDATION & HIGHER
Exam Practice: Work done and energy transfer
Work done and energy transfer · Forces · Lesson 4 of 20 · 13 marks · 14 minutes
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Instructions
• Answer all the questions.
• Write your answers in the spaces provided.
• The marks for each question are shown in brackets - use this as a guide to how much to write.
• The answers are on separate pages at the back. Attempt every question before you look at them.
• Answer all questions. Use the mark allocation as a guide to how much to write.
Question 1 CALCULATE (2 marks)
A person pushes a box with a force of 50 N. The box moves 12 m. Calculate the work done. Use the equation: work done = force × distance
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(Total for Question 1 = 2 marks)
Question 2 CALCULATE (3 marks)
A force does 1200 J of work moving a crate 8.0 m. Calculate the force.
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(Total for Question 2 = 3 marks)
Question 3 EXPLAIN (2 marks)
A bicycle rider brakes and the brake pads become warm. Explain why.
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(Total for Question 3 = 2 marks)
Question 4 DESCRIBE (2 marks)
State what one joule of work means in terms of force and distance.
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(Total for Question 4 = 2 marks)
Question 5 CALCULATE (4 marks)
A crane lifts a 200 kg load through 15 m at constant speed. Gravitational field strength = 9.8 N/kg. Calculate the work done on the load by the crane.
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(Total for Question 5 = 4 marks)
TOTAL FOR PAPER = 13 MARKS
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Answers and mark scheme
Check your answer only once you have written one.
Question 1 (2 marks)
50 × 12 = 600 J
• Correct substitution 1 mark
• 600 J 1 mark
Question 2 (3 marks)
F = W ÷ s = 1200 ÷ 8.0 = 150 N
• Rearranges to F = W ÷ s 1 mark
• Correct substitution 1 mark
• 150 N 1 mark
Question 3 (2 marks)
Work is done against the friction between the pads and the wheel. The kinetic energy of the bicycle is transferred to the thermal energy store of the brakes.
• Work done against friction 1 mark
• Kinetic to thermal energy store 1 mark
Question 4 (2 marks)
One joule is the work done when a force of one newton moves an object a distance of one metre in the direction of the force.
• Force of 1 N 1 mark
• Moves an object 1 m 1 mark
Question 5 (4 marks)
F = 200 × 9.8 = 1960 N; W = 1960 × 15 = 29 400 J
• Force = weight = mg 1 mark
• 1960 N 1 mark
• Correct substitution into W = Fs 1 mark
• 29 400 J 1 mark