Question:-
Which of the following statements regarding laws governing the friction between dry surface are correct
1. The friction force is dependent on the velocity of 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 dependent of the area of contact surface
Option (A)
2, 3 and 4
Option (B)
1 and 3
Option(C)
2 and 4
Option(D)
1, 2, 3, and 4
Correct Option:
(A)
Question Solution:
For dry surface
Friction force (F) = mR
m ® Coefficient of friction
R ® Normal force
Where m is dependent on the material of the contact surface and contact area.
question-answer-faq-3222