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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?
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?
1 Answer
- NCSLv 712 months agoFavorite 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!
