What is the use of a lever if its mechanical advantage is

(a) more than 1,

(b) equal to 1, and

(c) less than 1?

Draw diagrams to illustrate the position of fulcrum, load and effort, in each of the following:

(a) A seesaw

(b) A common balance

(c) A nutcracker

(d) Forceps

Draw a labelled diagram of a Class II lever. Give one example of such a lever.

Explain why the mechanical advantage of a class II type of lever is always more than 1.