Question

Friction depends on
(i) normal force on the object
(ii) roughness
(iii) area of contact
Choose the correct one

• A. Only (i) is correct
• B. Only (ii) is correct
• C. Only(iii) is correct
• D. Both (i) and (ii) are correct

Answer 1

The correct option is D Both (i) and (ii) are correct

The frictional force depends on the normal reaction force of the object. That is why it is easier to shift a lighter body on the ground than a heavier body.
Also, frictional force depends on the roughness of the surface in contact. The rougher the surface is, the higher is the frictional force.
The frictional force is independent of the area in contact.