The surface of a running track is made of rubber. A heavy trolley is pulled on to the track and it exerts a large force on the rubber track. State two effects that this force has on the rubber. 1. 2.

1. (a)The surface of a running track is made of rubber. A heavy trolley is pulled on to the track and it exerts a large force on the rubber track. State two effects that this force has on the rubber. 1. 2.[2]
2. (b)(i)A spring is suspended from a support with a small pan attached to its lower end. Masses are added to the pan until the spring is extended well beyond the limit of proportionality. Fig. 2.1 shows this apparatus. [Figure 2.1] A ruler is used when determining the extension of the spring. On Fig. 2.2, sketch the extension-load graph for the spring and label the limit of proportionality P. [Figure 2.2][2]
3. (b)(ii)The masses are then removed and the extension of the spring decreases. Suggest what is observed when all the masses are removed.[1]

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