A person pushes horizontally on block 8, causing both blocks to move horizontall

Question

A person pushes horizontally on block 8, causing both blocks to move horizontally as a unit. There is friction between block B and the horizontal table. If the two blocks are moving to the right at constant velocity A. B. C. D. E. B exerts no horizontal force on A. the horizontal force that B exerts on A points to the left the horizontal force that B exerts on A points to the right answer depends on the strength of the push. answer depends on the strength of the push and the masses of the blocks. Explain for full credit

Explanation / Answer

According to Newton's First law of motion -" If the vector sum of all the forces acting on a particle is zero then and only then the particle remains unaccelerated (i.e., reamains at rest or moves with constant velocity). "

So in the given problem the force between the surfaces of block A and B will be the same and in opposite direction(according to the Newton's third law).

But it is the friction force which counters the applied force on the block B and it must be the same in magnitude to the applied force at block B by the person to remain at constant velocity otherwise either it will accelerate or decelerate.

Thus

we can clearly say that the force B exerts on A is in the right direction and the direction of the force exerts by A to th B is in left direction.

Frictional force is always opposite to the applied force direction.

And if the system moves with constant velocity then the vector sum or the total force must be zero.

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