Question

The cam and follower without a spring forms a

(a) lower pair

(b) higher pair

(c) self closed pair

(d) force closed pair

This question was addressed to me in a dream while sleeping

I'd like to ask this question from Simple Mechanisms in portion Simple Mechanisms of Machine Kinematics

Answer 1

Right answer is (c) self closed pair

Easy explanation: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair. The lower pairs are self closed pair and the motion of cam and follower is relative to each other.