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Question

# Which of the following is/are true about the frictional force? 1. It acts between all moving objects. 2. It always opposes relative motion between two objects. 3. It is a contact force. 4. It is a non- contact force.

A

1, 3 and 4

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B

1 and 3

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C

2, 3 and 4

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D

All of the above

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Solution

## The correct option is C 2, 3 and 4 Friction is a force that opposes the relative motion between two objects. Since two surfaces need to be in contact, for friction to come into action, it is a contact force. It depends on the nature of surfaces in contact. It is more for rough surfaces.

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