Question

friction depends upon area of contact yes or no prove by an experiment​

Answer 1

Friction doesn't depend on area of contact.

Reason: Although a larger area of contact between two surfaces would create a larger source of frictional forces, it also reduces the pressure between the two surfaces for a given force holding them together. Since pressure equals force divided by the area of contact, it works out that the increase in friction generating area is exactly offset by the reduction in pressure; the resulting frictional forces, then, are dependent only on the frictional coefficient of the materials and the FORCE holding them together. 

If you were to increase the force as you increased the area to keep PRESSURE the same, then increasing the area WOULD increase the frictional force between the two surfaces.

Answer 2

Answer:

The force of friction always act on all the moving objects and it's direction is always opposite to the direction of motion. It is an example of contact fore as it arises due to contact between two surfaces...

• For example if we roll the ball along the ground, it gradually stops.

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