Question

Factors affecting Friction​

Answer 1

Answer:

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.

Answer 2

Explanation:

Friction depends on how hard the two surfaces pressed together, as more surface in contact and more bonds are formed→ more bonds to break → means more friction.

Only the normal reaction force (exactly perpendicular ) to the two surfaces increases friction.