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friction - worldaroundthem, answers(E ,or ,

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  To take part in a range of activities to explore the  world around them, and ask questions and suggest  answers (E)
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  Friction is a force between two surfaces that are sliding, or  trying to slide across one another, for example when you try to  push a toy car along the floor.   Friction always works in the direction opposite from  the direction the object is moving, or trying to move. It  always slows a moving object down. Moving Friction
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  The amount of friction depends on the materials from which the two  surfaces are made. The rougher the surface, the more friction is produced. For  example, you would have to push a book harder to get it moving on a carpet  than you would on a wooden floor. This is because there is more friction  between the carpet and the book than there is between the wood and the book.
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  Friction also produces heat. For example, if you rub  your hands together quickly, they get warmer. 
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