- #1
neelakash
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- 1
Homework Statement
Consider a smooth vertical wall against which a block is placed.Another block is also placed in contact with the earlier inner block.An external force F is acting horizontally on the outer block towards the wall.There is friction between the two blocks,but no friction between the wall and the inner block.The friction on the outer block by the inner block in equilibrium is
(i) upward
(ii) downward
(iii)zero
(iv)the system cannot be in equilibrium
Homework Equations
The Attempt at a Solution
I think it is upward,but the answer is (iv)
I cannot accept it from the free body diagram consideration...