Consider the two statements :
Statement A : Frictional Force can be zero even though the contact surface is rough.
Statement B : Even though there is no relative motion between surfaces, friction force force may exists between them.
Options a) Both A & B are true b) A is true B is false.
c) A is false but B is true. d) Both A & B are false.
Which and why is the right answer?

Question

Consider the two statements :
Statement A : Frictional Force can be zero even though the contact surface is rough.
Statement B : Even though there is no relative motion between surfaces, friction force force may exists between them.
Options a) Both A & B are true b) A is true B is false.
c) A is false but B is true. d) Both A & B are false.
Which and why is the right answer?

vincent-lyon.fr · Answer

Both are true.

anonymous · Answer

Pl explain as my daughter has answered option c as correct and she needs to know why she is not correct?

vincent-lyon.fr · Answer

If the contact surface is horizontal, and the object on it is at rest, without any sideways force pushing on it, then frictional force will be zero.

vincent-lyon.fr · Answer

The only contact force will be the normal force opposing weight of the object.