Question

In which of the following case, would there be friction acting between surface and block?
I Block kept on a horizontal smooth surface
II: Block kept on a horizontal rough surface
(Assume block is not moving in both the cases. Think!)
(A) Only in I
(B) Only in I
(C) Both in I and II
(D) None of them​

Answer 1

Answer:

D) None of them.

Hope this helps.