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Q.

Is it true that the frictional force is a non-contact force?


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a

True

b

False  

answer is B.

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Detailed Solution

The above statement is false.
The friction will only produce when the two surfaces are in contact with each other if there is no contact, there is no frictional force. For example, in static friction, when a force is applied to any object, then it is the frictional force that opposes it, keeping the object at rest until static friction is removed. On the other hand, kinetic friction is the frictional force that opposes the motion of an object.
The correct statement would be that the frictional force is a contact force.
 
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Is it true that the frictional force is a non-contact force?