O-LevelPhysicsForces5054/22 · Oct/Nov 2014 · Q24 Marks
In hospitals, doctors and nurses operate taps with their elbows in order to avoid contamination. Fig. 2.1 shows a hospital tap with a long handle. [Figure 2.1]
- (a)(i)A nurse applies a force of 2.5N at a point X on the handle, 0.18m from the axis of the tap. Calculate the maximum moment about the axis that this force can produce.[2]
- (a)(ii)The moment produced by the nurse is less than this maximum value. Suggest one reason why this is so.[1]
- (b)State how the force needed to operate the tap is affected by the length of the handle.[1]
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 (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [1] Fd or 2.5 × 0.18
- [1] 0.45 Nm
- [1] force not applied at right angles to the tap
- [1] long(er) distance needs small(er) force (for same moment) or inversely related/proportional
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