Three blocks move on a frictionless surface with a 56 N force acting on the 12 kg block as shown. Determine (a) the acceleration of the total system, (b) the tension in the cord connecting the 12 kg and the 3 kg blocks, and (c) the normal force exerted by the 3 kg block on the 1 kg block. I am especially confused by part c) I would really appreciate it if you could explain clearly. I originally thought (3kg)(acceleration), but would it be (1kg) (acceleration) for the Normal force exerted by the 3kg block on the 1 kg block instead?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.