A driver’s foot presses with a steady force of 20 N on a pedal in a car as shown.
 |
What is the force F pulling
on the piston?
A 2.5 N
B 10 N
C 100 N
D 160 N
B 10 N
C 100 N
D 160 N
Correct Answer: D (160 N)
Explanation:
Force applied by the
driver’s foot, F1 = 20 N
Distance from the
foot to the pivot, d1 = 40 cm
Force applied on the piston,
F = ?
Distance from the
pivot to the piston, d = 5 cm
From the principle of
moments,
F x d = F1 X d1
F x 5 cm = 20 N x 40
cm
F = (20 N x 40 cm) /
5 cm
F = 800 / 5 N = 160 N
