The force required to overcome the friction of a moving body and keep it moving with the same speed is called ______.
A
fluid friction
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B
sliding friction
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C
static friction
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D
rolling friction
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Solution
The correct option is C sliding friction The force required to keep a moving object in motion with the same speed is called sliding friction. It is easier to do this than to put a static object in motion, thus sliding friction is smaller than static friction because when an object is in motion the points of contact on the surface do not get enough time to interlock into each other.