Question

4. Which of the following action will increase the frictional force?
(a) Lubricating surface (b) increasing area of contact (c) Polishing the surface(d) Using wheel.​

Answer 1

Answer:

using wheel will increase the frictional force

Answer 2

Answer:

By increasing the area of contact , the frictional force will increase

Explanation:

Becoz , if the area of contact increased, then the pressure will increase by causing to increase the frictional force...

I hope u got this......