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AQA · GCSE · Combined Science · Higher

Pressure-driven wheel speed

Q06.4 1 mark

Figure 12 shows a device that uses a mug of hot coffee to turn a wheel.

A device on top of a mug of hot coffee. Labels identify a wheel, piston, air chamber and hot coffee.

Figure 12

Enlarged question image

A device on top of a mug of hot coffee. Labels identify a wheel, piston, air chamber and hot coffee.
Figure 12

The changes in pressure in the air chamber cause the wheel to turn.

Suggest one way to increase the speed at which the wheel turns.

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Marking points

  1. 1 Suggest a valid way to increase the wheel speed, such as lubricating the device or wheel, using hotter coffee, or decreasing the temperature of the surroundings.

Full-mark answer

Use hotter coffee.

Why this answer loses marks

Use colder coffee.

Colder coffee would reduce the temperature difference and is not a credited way to increase the wheel speed.

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