When an object is slided on a flat rough surface, it is difficult to attain a uniform motion primarily because of ____.
A
gravitation
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B
friction
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C
inertia
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D
pressure
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Solution
The correct option is B friction Frictional force is a contact force. It opposes the relative motion between the surfaces in contact. Since friction is acting against the direction of motion of the body, it eventually comes to rest.