O-LevelPhysicsForces5054/22 · May/June 2017 · Q36 Marks
Fig. 3.1 shows the brake pedal of a car which is connected to a brake cylinder. The brake is pressed with a force F. This force produces a moment about the pivot. Pressing the brake causes a force of 80 N to act on the piston. [Figure 3.1]
- (a)Define the term moment.[2]
- (b)Calculate the force F applied to the brake pedal.[2]
- (c)The cross-sectional area of the piston is 0.0012m². Calculate the pressure exerted by the brake piston on the fluid.[2]
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Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [1] force x distance
- [1] force x perpendicular distance (from line of action to point / pivot)
- [1] any moment calculation seen, e.g. F × 22 = 80 × 4
- [1] 15 N
- [1] (P=) force / area or 80/0.0012
- [1] 6.7 x 10^4 Pa
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