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The diagram below shows a bath mat used in a bath tub.

(b) Based on the information provided above, which material is most suitable to be made into a bath mat? Give a reason for your answer. (2m)

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Which material has the smoothest surface? Explain your answer based on the obtained results and concept of forces.  (1m)

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David conducted an experiment to find out how the different surfaces will affect the distance travelled by the block as shown in the diagram.  He pushed the box from the starting point with the same amount of force over material A, B, C and D and recorded the distance travelled by the box.

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Which spring (P or Q) is more suitable to be used as the spring in the trampoline? Explain your answer. (1m)

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A boy was jumping on a trampoline. A trampoline is made of a fabric attached by springs to a metal frame.

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What is the relationship between the mass of the load and the extension of spring P? (1m)

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The graph below shows the length of 2 different springs (P and Q) when different loads were hung on it.