What is lever? How are levers classified? Give two examples of each category?

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Solution

Lever is a rigid bar or rod that can move about fixed support or point.
Fixed support or point about which the lever rotates is called a fulcrum.
Lever is used to lift heavy weights with the minimum amount of effort.
There are three different classes of levers: class I lever, class Il lever and class III lever.
In class I lever, the fulcrum is between the effort and the load. ex-pliers, scissors,
In class Il lever, the load is between the fulcrum and the effort. ex-A wheelbarrow, a bottle opener
In class lll lever, the effort is between the fulcrum and the load. ex-fishing road, a broom

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(b) What are the advantages of using a machine?

(d) What can you use as an inclined plane?

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(f) What is meant by a complex machine? Give an example.

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