Draw a labelled sketch of a class III lever. Give one example of this kind of lever.

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

Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in 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?