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Q5. Sarah made a cotton reel vehicle like the one shown in the diagram. The pencil is wound round and round so that it winds up the rubber band. A piece of candle wax next to the cotton reel lets the rubber band slowly unwind.

(a) As the rubber band unwinds, the candle wax slips and the cotton reel turns. Name the force which acts between the cotton reel and the candle wax.

1 mark

(b) Sarah tested the vehicle by letting it run along a horizontal table top.

(i) She noticed that the vehicle gradually slowed down. Give the reason for this.

1 mark

(ii) Describe what Sarah could do to make the rubber band move this vehicle faster.

1 mark

Maximum 3 marks