A 1.00 kg block sits on a 4.00 kg block which rests on a smooth table. A force of 12.0 N acts at an angle of 25.0° to the horizontal on block M1 and causes both blocks to move with the same acceleration. i. Draw the free body diagram for each block.  Determine: ii. the acceleration of each block,  iii. the normal force exerted by the table on M1, and  iv. the magnitude of the frictional force between the two 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?”