A machine works as a

(i) force multiplier,

(ii) speed multiplier.

In each case state whether the velocity ratio is more than or less than 1.

How is mechanical advantage related to the velocity ratio for an actual machine? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1.

Give one example each of a class I lever where the mechanical advantage is

(a) more than 1, and

(b) less than 1.

Classify the following into levers as class I, class II or class III:

(a) A door

(b) A catapult

(c) Claw hammer

(d) A wheel barrow

(e) A fishing rod

(f) Sugar tongs