The drawing shows box 1 resting on a table, with box 2 resting on top of box 1.

Question

The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1 = 59.2 N, W2 = 39.9 N, and W3 = 26.8 N. Determine the magnitude of the normal force that the table exerts on box 1.

The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1 = 59.2 N, W2 = 39.9 N, and W3 = 26.8 N. Determine the magnitude of the normal force that the table exerts on box 1.

Explanation / Answer

W1 = 59.2N W2 = 39.9N W3 = 26.8 N

-W1 - W2 + FN + T = 0


of the tension in the rope . the net force acting on it must be zero. -W3 + T = 0 T = W3 -W1 - W2 + FN + W3 = 0 FN = W1+W2 - W3 = 59.2 N+ 39.9N - 26.8 N =72.3 N




of the tension in the rope . the net force acting on it must be zero. -W3 + T = 0 T = W3 -W1 - W2 + FN + W3 = 0 FN = W1+W2 - W3 = 59.2 N+ 39.9N - 26.8 N =72.3 N

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