define friction and give two examples
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Explanation:
As an object falls, air resistance pushes up on the object. When you ride a bicycle, the contact between the wheel and the road is an example of rolling friction. When an object rolls over a surface, the force needed to overcome rolling friction is much less than that needed to overcome sliding friction.
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Explanation:
friction is the force resistance to motion of one object moving relative to another and the coefficient of friction depends on the material used or example ice on steel......
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