Question

Which of the following statements regarding laws governing the friction between dry surfaces are correct?

1. The friction force is dependent on the velocity sliding.
2. The friction force is directly proportional to the normal force.
3. The friction force is dependent on the materials of the contact surfaces.
4.The friction force is independent of the area of contact

Select the correct answer using the codes given below

• A. 2, 3 and 4
• B. l and 3
• C. 2 and 4
• D. 1 , 2, 3 and 4

Answer 1

The correct option is A 2, 3 and 4

1. Frictional force is independent of velocity.

2. The friction force is directly proportional to the normal force.

3. The friction force is dependent on the materials of the contact surfaces.

4.The friction force is independent of the area of contact