A steel wheel of 600 mm diameter on a horizontal steel rail.

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A steel wheel of 600 mm diameter on a horizontal steel rail. It carries a load of 500 N. The coefficient of rolling resistance is 0.3 The force in Newton, necessary to roll the wheel along the rail is

1. 0.5
2. 5
3. 1.5
4. 150

Correct Option: D

r =	600	= 300 mm.
	2

W = 500 N.
∴ F = μ × W
= 0.3 × 500 = 150 N