Block A with a mass of ma= 7.0 kg moves on a level, horizontal table. Block A is connected to block B with a mass of mb= 6.0 kg by a light string that passes over a frictionless pulley. The coefficient of kinetic friction block A and the table is 0.25.  1. Draw two clearly labeled free-body diagrams; one for block A and one for block B.  2. Find the acceleration of the blocks.  3. What is the tension acting in the string? 4. If, instead there was no friction between block A and the table, what would be the new acceleration of the blocks ?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”