Problem 1 Two boxes, A and B, are connected by an ideal (massless) cord and are resting on a smooth (frictionless) table. The boxes have masses of 12.0 kg and 10.0 kg. A horizontal force FP of 40.0 N pulls on the 10-kg box. (a) Find the acceleration of each box. (b) Find the tension force in the cord connecting the two boxes. Solution 1. Sketch the free body diagrams below: 2. Use the free body diagrams you have sketched to apply Newton’s 2nd law separately to each object. 3. Now we can solve our problem. Find (a) the acceleration and (b) the tension force.

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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?”