Question

When the two surfaces are pressed harder, friction increases. Explain why?

Answer 1

Answer:

Friction between two surfaces increases when they are pressed harder because there are irregularities between two surfaces which tries to lock the two surfaces. When two surfaces are rubbed harder then irregularities get more time to increase their contact which in turn lead to increased friction

Explanation:

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Answer 2

When 2 surfaces are pressed harder, friction increases !

But why ?

• The general mathematical expression of friction between two surfaces is given as :

$\boxed{f = \mu \times N}$

• $\mu$ is friction coefficient and N is normal force (or contact force).

Now, two surfaces are pressed harder, the the value of normal reaction or the contact force (N) increases.

$\star$ This leads to increase in friction.

• At a micro level, we say that upon pressing, the various irregularities on both the surfaces interlock with each other resulting in increased resistance or friction.