A student investigated the efficiency of a motor using the equipment in Figure 15 - AQA - GCSE Physics - Question 13 - 2018 - Paper 1
Question 13
A student investigated the efficiency of a motor using the equipment in Figure 15.
He used the motor to lift a weight of 2.5 N a height of 2.0 m.
He measured the s... show full transcript
Worked Solution & Example Answer:A student investigated the efficiency of a motor using the equipment in Figure 15 - AQA - GCSE Physics - Question 13 - 2018 - Paper 1
Step 1
Give one variable that the student controlled in his investigation.
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Answer
One variable that the student controlled in his investigation is the weight lifted.
Step 2
Give two reasons for taking repeat readings in 2.0 m.
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Answer
To calculate a mean value for greater accuracy.
To spot anomalies in the data.
Step 3
Give two conclusions that could be made from the data in Figure 16.
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Answer
As speed increases, the efficiency increases, but the graph tends towards a constant value.
Efficiency cannot exceed 100%.
Step 4
Give the main way that the motor is likely to waste energy.
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Answer
The main way that the motor is likely to waste energy is by heating the surroundings.
Step 5
State the efficiency of the motor.
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