Question

A wheel experiences two equal and opposite forces of 40 N applied at points on the rim with a diameter of 0.5 m, forming a couple. The couple magnitude is

Options

• 10 N m

• 20 N m

• 40 N m

• 80 N m

Answer 1

20 N m

Explanation:

Perpendicular separation equals the diameter d = 0.5 m; M = Fd = 40 × 0.5 = 20 N m.