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Question

Which of the following are correct
  1. Friction always opposes motion
  2. Two bodies need to be in contact for friction to act
  3. Friction occurs only between solids
  4. Friction always opposes relative motion


Solution

The correct options are
B Two bodies need to be in contact for friction to act
D Friction always opposes relative motion
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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