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Q.

When an object is in motion on a rough surface then which type of friction acts on it?

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a

Static Friction

b

Kinetic Friction

c

Spatial Friction

d

Air Friction

answer is B.

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Detailed Solution

Whenever an object is in motion on a rough surface then the type of friction that acts on it is called kinetic friction. 

Kinetic Friction is less or equal to static friction. 

Kinetic friction is of two types, rolling friction and sliding friction. 

In sliding friction, two surfaces are continuously in contact with each other. Whereas in rolling friction, one object rolls over the other object or the surface. 

Rolling friction is less than sliding friction as the two surfaces are in contact for very less time.

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