a) When the surface of one object moves relative to the surface of another object, static friction exerts, 

Monjur Alahi

a) When the surface of one object moves relative to the surface of another object, static friction exerts, 

b) When surfaces of the objects are at rest, sliding friction exerts. 

A) a is true 

B) b is true 

C) both a and b are true 

D) both a and b are false


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Salim Ahmed Kawsar

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D) both a and b are false

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