A skateboarder of mass 45 kg is at the top of a ramp. Fig. 2.1 shows the skateboarder and the ramp. [Figure 2.1]

1. (a)The skateboarder moves off and she descends vertically through 1.8m. The gravitational field strength g is 10N/kg.
2. (a)(i)Calculate the change in gravitational potential energy of the skateboarder. energy change = ..............................................................[2][2]
3. (a)(ii)State the name of two forms of energy that increase as she descends. 1. 2. [2][2]
4. (b)At the lowest point on the ramp, the skateboarder is travelling at a constant speed along a path which is part of a vertical circle. State
5. (b)(i)the direction of the resultant force on the skateboarder at this point, ....[1][1]
6. (b)(ii)how the weight of the skateboarder compares with the upward force that the ramp exerts on her. ...............................................................................................................................................[1][1]

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