Rolling resistance, sometimes called rolling friction or rolling drag, is the
resistance that occurs when an object such as a ball or
tire rolls. It is caused by the deformation of the wheel or tire or the deformation of the ground. It depends very much on the material of the wheel or tire and the sort of ground. For example,
rubber will give a bigger rolling resistance than
steel. Also,
sand on the ground will give more rolling resistance than
concrete. A
vehicle rolling will gradually slow down due to rolling resistance, but a
train with steel wheels running on
steel rails will roll much further than a
car or
truck with rubber tires running on pavement, even when differences in mass and momentum are accounted for. The coefficient of rolling resistance is generally much smaller for tires or balls than the coefficient of
sliding friction.
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