Q.

What is sliding friction? 

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a

A force between two surfaces in contact with each other.     

b

A frictional force that is equal to the sliding force.

c

A frictional force that helps the objects slide over each other.

d

A frictional force that opposes the relative sliding motion between the two surfaces in contact 

answer is B.

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Detailed Solution

A frictional force that opposes the relative sliding motion between the two surfaces in contact is called sliding friction. Sliding friction arises when objects are already in motion, for example, friction between a moving car and a road. It is always less than static friction because sliding objects find less time to interlock with each other.

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