E. Answer the following questions. 1. Define lever. How many types of levers are there and what is the difference between them? 2. What is an inclined plane?What is it used for? 3. What is a wedge? 4. What is a screw? Why is called the modification of an inclined plane?
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1) A lever is a simple yet Powerful machine which can move a large and heavy load by a small effort .
There are Three types of lever :-
(a) Level 1 lever
(b) level 2 lever
(c) level 3 lever
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