Question

Which of the following motion is used only up to moderate speeds?

(a) Simple harmonic

(b) Uniform acceleration

(c) Uniform velocity

(d) Uniform acceleration and retardation

The question was posed to me in homework.

My question is based upon Velocity and Acceleration Diagrams in portion Cams of Machine Dynamics

Answer 1

Correct choice is (d) Uniform acceleration and retardation

To explain I would say: It is observed from the plots of uniform acceleration and retardation that there are abrupt changes in the acceleration at the beginning, midway and the end of the follower motion. At midway, an infinite jerk is produced.