In the adjoining figure, the coefficient of friction between wedge (of mass M) and block (of mass m) is μ.
Find the minimum horizontal force F required to keep the block stationary with respect to wedge.
FBD of ′m′ with respect to wedge (real + one pseudo force)with respect to wedge block is stationary.∴∑Fx=0=∑Fy∴mg=μN and N=maa=gμand F=(M+m)a=(M+m)gμ