O-LevelPhysicsMeasurement5054/22 · May/June 2017 · Q26 Marks
A swing is made by tying rope loosely to the branch of a tree, as shown in Fig. 2.1. A child swings backwards and forwards several times, starting at the highest point A. [Figure 2.1]
- (a)Explain how another child can obtain an accurate measurement of the time for one complete swing.[2]
- (b)(i)When the child moves from A to B, she falls a vertical distance of 0.60m. She loses 240 J of gravitational potential energy. The gravitational field strength g is 10N/kg. Calculate the mass of the child.[2]
- (b)(ii)Suggest two reasons why her kinetic energy at B is not equal to 240 J.[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 2017). The mark or mark type is shown in brackets.
- [1] use of stopwatch or electronic timer
- [1] time at least 5 swings and divide by number of swings or use of fiducial mark or definition of one swing clear e.g. A to C to A or from A and back to A
- [1] (m=) P.E./gh or 240 / 10 × 0.6
- [1] 40 kg
- [1] air resistance or friction (with air or rope and tree)
- [1] heat produced / work done (in / against air or friction) or effect of wind or work done by arms / legs
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