what is the working principle of wheel and axle, levers, inclined plane, screw and wedge?

Kindly post your questions in different threads to get all the answers.
Refer to the link given below for the principle of inclined plane .
https://www.meritnation.com/ask-answer/question/what-is-the-principle-of-an-inclined-plane/science/3849638
 

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