Friction is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when you try to push a book along the floor, friction makes this difficult. It always works in the direction opposite to the direction in which the object is moving, or trying to move. It always slows a moving object down.
Friction also produces heat. For example, if you rub your hands together quickly, you will feel them get warmer.
Another example, is when you are driving your tyres and the road are being applied with friction, enabling the car to driving without the car slipping and sliding across the road.
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