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?

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

A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.