Two blocks A and B are pushed against the wall with the force F as shown in the figure. The wall is smooth but surfaces of A and B in contact with each other are rough. Which of the following is true for the system of blocks to be at rest against the wall?

Question

Two blocks A and B are pushed against the wall with the force F as shown in the figure. The wall is smooth but surfaces of A and B in contact with each other are rough. Which of the following is true for the system of blocks to be at rest against the wall? (A) F should be equal to the weight of A and B (B) F should be more than the weight of A and B (C) F should be three time the weight of A and B (D) System cannot be in equilibrium

Tardigrade Admin · Accepted Answer

Since wall is smooth hence blocks will fall due to own weight and system will not be in equilibrium.

Q. Two blocks A and B are pushed against the wall with the force F as shown in the figure. The wall is smooth but surfaces of A and B in contact with each other are rough. Which of the following is true for the system of blocks to be at rest against the wall?

F should be equal to the weight of A and B

F should be more than the weight of A and B

F should be three time the weight of A and B

System cannot be in equilibrium

Since wall is smooth hence blocks will fall due to own weight and system will not be in equilibrium.