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If I stand on a floor, the normal force on me is equal as compare to my weight.
What is normal force?
The component of a contact force in mechanics known as the normal force is perpendicular to the surface that an item encounters. In this context, normal refers to perpendicular in a geometric sense rather than "usual" or "expected" as it does in everyday parlance. Gravity acts on a person standing stationary on a platform; gravity would otherwise draw the person down into the Earth's core absent a countervailing force from the resistance of the platform's molecules, known as the "normal force."
A good example of Newton's third law is what happens when you put a book on a table: the book applies a normal force downward to the table, and the table applies a normal force upward to the book. Why is the book pressing down on the table, you could wonder? There are numerous potential causes. If nothing else is in contact with the book, the only force acting on it would be the weight it would experience due to the earth's gravitational pull, which the table would then work to counteract.
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