The figure shows three forces applied to a trunk that moves leftward by 3.26 m over a frictionless floor. The force magnitudes are F1 = 4.85?

Question

The figure shows three forces applied to a trunk that moves leftward by 3.26 m over a frictionless floor. The force magnitudes are F1 = 4.85 N, F2 = 9.33 N, and F3 = 2.92 N, and the indicated angle is θ = 60°. (a) During the displacement, what is the net work done on the trunk by the three applied forces, the gravitational force, and the normal force? (b) Is there a net transfer of energy to or from the trunk? (c) Does the kinetic energy of the trunk increase or decrease?

? · Accepted Answer

The vertical forces do no work, since the motion is horizontal. The net horizontal force is
Fx = (4.85 - 9.33cos60º) N = 0.185 N
to the left
and so the work done is positive

(a) net work = Fx * x = 0.185N * 3.26m = 0.603 J
by the applied forces

0 J by the gravitational and normal forces (since they are perpendicular to the direction of motion)

(b) net transfer TO the trunk

(c) KE INCREASES
(by 0.603 J)

Hope this helps!

The figure shows three forces applied to a trunk that moves leftward by 3.26 m over a frictionless floor. The force magnitudes are F1 = 4.85?

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