Question

Which of the following statements are correct about the force of friction?

1. It acts on all moving objects.

2. It opposes the relative motion between two objects in contact with each other.

3. It is a contact force.

• A. 1, 3 and 4
• B. 1 and 3
• C. 2, 3 and 4
• D. All of the above

Answer 1

The correct option is D

All of the above

Friction is a force that opposes the relative motion between two surfaces in contact. Since contact is a must for friction to come into action, it is a type of contact force. However, it doesn't act on all moving objects. For example, for a body moving through vacuum, friction won't act.