Question

Blocks shown in figure moves with constant velocity 10 m/s towards right. All surfaces is contact are rough. The friction force applied by B on A is.

Answer 1

The blocks move with constant velocity. Thus the net force acting on the system is 0.

External force acting on A 20N. Since the net force acting on B is 0, friction must be 20N in opposite direction of external force.

External force acting on A is 0 and net force on A is 0. Hence friction on A due to B is 0.

Hence, answer is 0.

Answer 2

Answer:

Zero Newton

Explanation:

Given that blocks are moving with constant velocity, it means that all forces on block are balanced and net force is zero.

external force on block A is 0 Since net force on block A is zero therefore friction force on A due to B must be Zero

Similarly, external force on block B is 20 N . since net force on block B is zero therefore friction force on block B must be 20 N.