Question

why does friction between two surfaces increases when they are pressed harder

Answer 1

hey here is your answer

Friction is due to irregularities on the surfaces of the objects in contact. The force of friction increases if the surfaces are pressed harder. ... Rolling friction is less than sliding friction, while sliding friction is less than static friction.

Answer 2

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. Also, a lot of energy is released when two surfaces are pressed harder.

hope this will help you.