1.

(i) What is meant by an ideal machine ? (ii) Write a relationship between the mechanical advantage (M.A.) and velocity ratio (V.R.) of an ideal machine. (iii) A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.

Answer»

(i) A machine with 100% efficiency is called an ideal machine. 

(ii) For an ideal machine, M.A. = V.R. 

(iii) Because the angle between the force applied (vertically upwards) and displacement of load (along the horizontal) is 90°. 

∵ W = Fd cos θ 

∴ W = Fd cos 90° = 0



Discussion

No Comment Found

Related InterviewSolutions