Question

Define Friction. Give two examples where friction is useful.

Answer 1

Define Friction. Give two examples where friction is useful.

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Here is your perfect answer!

Friction is a force (generally reactional force) which opposes the motion of an object.

It is a contact force. Exists in nature due to microscopic unregularities on the surface.

Two examples -

1) To stop ourselves during walking.

2) To keep writing well.

Answer 2

The force that opposes motion when two surfaces in contact move or tends to move with respect to each other is called Friction.

Two examples where Friction is useful are:
• Helps in stopping the moving car.
• Helps us to write on the paper.