Question

Rotation is termed as rolling when _______

(a) Constant velocity of rolling

(b) Variable velocity of rolling

(c) Constant speed of rolling

(d) Variable speed of rolling

I got this question in my homework.

Question is taken from Rolling Resistance in section Friction of Engineering Mechanics

Answer 1

Right option is (a) Constant velocity of rolling

The explanation is: The rolling of the cylinder is termed as perfect rolling only when the cylinder is rolling at a constant velocity. Also, the rolling should be along the rigid surface. The normal forces are acting perpendicular to the surface of the rolling.