Assertion : By pressing a block against a rough wall, one can balance it.
Reason : Smooth walls can not hold the block by pressing the block against the wall, however high the force is exerted.

A girl press her physics text book against a rough vertical wall with her hand. The direction of the frictional force on the book exerted by the wall is

A girl press her physics text book against a rough vertical wall with her hand. The direction of the frictional force on the book exerted by the wall is

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is:

Given in the figure are two blocks A and B of weight 20 N and 100 N respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is:

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is:

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is:

Given in figure are two blocks A and B of weight 20N and 100N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is:

A block weighing w is held against a vertical wall be pressing horizontally with a force F. Then, F needed to hold the block is

A block of mass 0.1 kg is kept pressed against a wall by applying a force of 5 N horizontally on the block. Coefficient of friction between the block and the wall is 0.5. Friction acting on the block is.