Which of the following statements regarding laws governing the friction between dry surfaces 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 independent of the area of contact surfaces.

Which of the following statements regarding laws governing the friction between dry surfaces 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 independent of the area of contact surfaces. Correct Answer 2, 3 and 4

CONCEPT:

Law of limiting friction:

  • The limiting friction depends on the nature of the surfaces in contact and their state of polish.
  • The limiting friction acts tangential to the two surfaces in contact and in a direction opposite to the direction of motion of the body.
  • The value of limiting friction is independent of the area of the surface in contact so long as the normal reaction remains the same.
  • The limiting friction is directly proportional to the normal reaction R between the two surfaces.

EXPLANATION:

The force of solid friction

1. Is directly proportional to normal force between the two surfaces

2. Opposes the motion between the surfaces

3. Depends upon the material of the two surfaces

4. Is independent of the area of contact

5. Is independent of the velocity of sliding.

Bissoy MCQ

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