question_answer 33)

Two bodies A and B of masses 5 kg and 10kg in contact with each other rest on a table against a rigid partition. The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally at A. What are (i) the reaction of the partition (ii) the action-reaction forces between A and B ? What happens when the partition is removed ?   Does answers to (ii) change/when the bodies are in motion ? Ignore difference between  and.  

Answer:

Mass of body A,   Mass of body B,   Coefficient of friction,                    Applied force,     P = 200 N   Fig. 5.136 (i) Force of limiting friction is                                     (towards left) When a force of 200 N is applied, the net force exerted on the partition is   (towards right) Reaction of the partition = 177.95 N (towards left) (ii) Force of limiting friction on body A is   Net force exerted by body A on body B is   (towards right) Reaction of body B on A =192.65 N (towards left) When the partition is removed. The system of the two bodies moves under the action of the net force,   Acceleration produced in the system,  . Force producing motion in the body A   Net force exerted by A on B after the removal of partition   (towards right) Reaction of the body B on A = 133.5 N.