Friction

What is fricton? Friction is the force that works against anything being moved.

Friction in action.

Friction is the force that stops things from moving. You only notice friction when you try to move. You can think of friction as a kind of sticky force, a kind of invisible glue.

It is quite hard to overcome this force, which is why you have to put in effort (a push or a pull force) in order to get something moving. Once it is moving, keeping it moving much easier. So, for example, it is much more efficient on fuel to keep a car going than to keep stopping and starting it in traffic.

Video: Friction.

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