O-LevelPhysicsEnergy & Work5054/21 · May/June 2015 · Q25 Marks
Fig. 2.1 shows a student doing a press-up. A total force F acts upwards on his hands. There is also a force upwards on his toes. The weight of the student is 600N and this force acts downwards from his centre of mass. [Figure 2.1 (not to scale)]
- (a)(i)Explain why the student does work as his body rises from the ground.[1]
- (a)(ii)State the form of energy that the student uses to do this work.[1]
- (b)(i)Calculate the moment of the weight of the student about his toes.[1]
- (b)(ii)Calculate the value of the force F.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.
- [1] force moves through a distance (in same direction)
- [1] chemical (potential) energy
- [1] 480 Nm
- [1] attempt to apply moments with two forces and distances
- [1] 400 N
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