Question

Friction is caused by the___
of the surfaces in contact
​

Answer 1

Answer:

Friction is directly proportional to mass. Heavier an object more force to be applied to move it. Therefore heavier box will press floor surface harder as compared to the lighter box. This implies heavier box will experience more friction, so more force have to be applied to overcome friction.

Answer 2

Answer:

interlocking of irregularities

this answer is not copy pasted

hope it helps you