Figure 2.1 shows a diagram of a car brake pedal. The driver applies a force of 14 N to the end of the brake pedal. The piston applies a force of 72 N to the brake pedal.

Figure 2.1, a side view of a car brake pedal pivoted at its top: a driver's foot presses on the lower end with a force of 14 N at a perpendicular distance of 19.6 cm from the pivot, and a piston in brake fluid pushes on the pedal with a force of 72 N at a perpendicular distance d from the pivot

Show that the moment of the 14 N force about the pivot is approximately 270 N cm.

Answer

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2(b)Moments Equilibrium Centre MassEasy2 marks

The brake pedal is stationary. The piston exerts a force of 72 N on the brake pedal. Calculate the distance

d

2(c)Density PressureEasy2 marks

The pressure exerted by the brake fluid on the piston is

8.4 \times 1 0^{4}

Pa. Calculate the cross-sectional area of the piston.