Question

The motion transmitted between the teeth of gears in mesh is

(a) sliding

(b) rolling

(c) may be rolling or sliding depending upon the shape of teeth

(d) partly sliding and partly rolling

This question was addressed to me during an interview for a job.

Enquiry is from Simple Mechanisms topic in chapter Simple Mechanisms of Machine Kinematics

Answer 1

Correct answer is (d) partly sliding and partly rolling

The best explanation: When the two elements of a pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, and in mesh the gears have a point contact.