A rought vertical board has an acceleration a, so that a 2kg block pressing against it does not fall. The coefficient of friction between the block and the board is μ, then
A
μ>ag
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
μ<ga
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
μ<ag
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
μ>ga
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is Dμ>ga By the free body diagram of the block,
The wall presses the block and so the reaction force towards left is R and the pseudo force on the block will be towards right as ma
The frictional force (f) here will prevent the block from falling
By the equilibrium condition, balancing the forces in vertical direction we get,