Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure . The coefficient of friction between the floor and the blocks are mu_(s) = mu_(k) = 0.4 . Block A is pushed by an external force F . The value of F can be changed . When the welding between block A and ground breaks , block A will start pressing block B and when welding of B also breaks , block B will start pressing the vertical wall . If F = 50 N , the friction force acting between block B and ground will be :

Two bodies A and B of masses 10 kg and 5 kg are placed very slightly s

1.	Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure . The coefficient of friction between the floor and the blocks are mu_(s) = mu_(k) = 0.4 . Block A is pushed by an external force F . The value of F can be changed . When the welding between block A and ground breaks , block A will start pressing block B and when welding of B also breaks , block B will start pressing the vertical wall . If F = 50 N , the friction force acting between block B and ground will be :
Answer» 10 N 20 N 30 N zero Solution :If ` ""` F = 50 N as `"" F gt f_(L)` So CONTACT FORCE between A and B is 10 N .