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Back to AQA Physics Paper 1 Specimen (set 1) Home

Paper 1 H - SAMPLE SET 1 Q5

5) A student investigated the efficiency of a motor using the equipment in Figure 4. 
Picture
He used the motor to lift a weight of 2.5 N a height of 2.0 m.
He measured the speed at which the weight was lifted and calculated the efficiency of the energy transfer.
He repeated the experiment to gain two sets of data.

5.1) Give one variable that the student controlled in his investigation. [1 mark]

5.2) Give two reasons for taking repeat readings in an investigation. [2 marks]
1. _______________________________________
2. _______________________________________
​
Figure 5 shows a graph of the student’s results. 
Picture
5.3) Give two conclusions that could be made from the data in Figure 5? [2 marks]

5.4) Give the main way that the motor is likely to waste energy. [1 mark]

5.5) When the total power input to the motor was 5 W the motor could not lift the 2.5 N weight.
State the efficiency of the motor. [1 mark]
​
Efficiency = _____________ %
​ ​
(Total for Question 5 = 7 marks)
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