Question

Prove that the force of friction depends on the nature of the two surfaces in contact

Answer 1

To see the effect of friction on different surfaces.

1 Take a sheet of paper, a handkerchief, a hand towel, a rectangular piece of glass and wood as surfaces and a pencil.

2 Now roll the pencil on each surface.
3 Number the surfaces in the order in which the pencil rolled easily on them. Also, mention whether the surface is rough or smooth.

What do you observe ?
You will observe that pencil rolls most easily on the smoothest surface.

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Answer 2

Answer:

Collect the following things :

A thick book, nylon cloth, gunny cloth, plastic sheet, jute cloth and sand paper.

Explanation:

Place the book on each of the materials and slide it on the floor one by one. If your book slides off the plastic sheet or nylon cloth, use adhesive tap to stick it firmly on the surface of the book.

You will observe that the different materials offer different amounts of resistances to sliding.

This activity shows that force of friction depends on the nature of the surface in contact. In general, smooth surface offers lesser friction than rough surface.