Figure 7-29 shows three forces applied to a trunk that moves leftward by 3.73 m

Question

Figure 7-29 shows three forces applied to a trunk that moves leftward by 3.73 m over a frictionless floor. The force magnitudes are F1 = 8.90 N, F2 = 5.59 N, and F3 = 2.12 N and the indicated angle is ? = 66.0

Figure 7-29 shows three forces applied to a trunk that moves leftward by 3.73 m over a frictionless floor. The force magnitudes are F1 = 8.90 N, F2 = 5.59 N, and F3 = 2.12 N and the indicated angle is ? = 66.0 degree . During the displacement, what is the net work done on the trunk by the three forces? Number

Explanation / Answer

W1 = F d cos theta = 8.9*3.73

W2 = F d cos theta = 5.59*3.73*cos(90+66 degrees)

W3 = F d cos theta = 2.12*3.73*cos(90) = 0

so

Wnet=8.9*3.73+5.59*3.73*cos(156 degrees)=14.15 J

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