Give me a brief intro about Exertion of force on different surfaces

Question

please do give some brief introduction about it.

Answer 1

There are 2 kinds of forces between surfaces :

Normal reaction : It acts perpendicular to the surface. For example, a book kept on a table experiences normal reaction from the table in the vertically upward direction (which is perpendicular to the table top and the surface of the book in contact with the table)

Frictional force : It acts parallel to the surfaces in contact. It tries to stop the relative motion between the 2 surfaces. For example, if you try to push a book kept on a table with a small force, it does not move. This is because the applied force (which is parallel to the surfaces in contact) is balanced by the frictional force.

Hope this helps.

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