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

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

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

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?