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Friction Coursework

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Have a little read: ... Friction Coursework What is Friction? Friction the a force that appears whenever two things rub against each other. Although two objects might look smooth, microscopically, they're very rough and jagged. No matter which direction something moves in, friction pulls it the other way. As they slide against each other, their contact is rough. They both grind and drag against each other. This is friction. Friction has a lot to do with life, as we know it here on Earth. Without it, we wouldn't be able sit on a chair, climb stairs or even move the direction you want. Everything would just keep slipping and falling all over the place. Without friction the wheels of a locomotive could not grip the rails nor could belts transmit power. On the other hand, in the moving parts of machines a minimum of friction is desired; an excess of friction produces heat, which in turn causes expansion,

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