Net Work & Kinetic Energy Video Lessons

Concept

# Problem: A 40.0-kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied horizontal force of 130 N. The coefficient of friction between box and floor is 0.300. Find(a) the work done by the applied force,(b) the increase in internal energy in the box–floor system as a result of friction,(c) the work done by the normal force, (d) the work done by the gravitational force,(e) the change in kinetic energy of the box, and(f) the final speed of the box.

###### FREE Expert Solution

(a)

The work done by applied force is given by:

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbf{F}}{\mathbf{·}}{\mathbf{d}}}$

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###### Problem Details

A 40.0-kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied horizontal force of 130 N. The coefficient of friction between box and floor is 0.300. Find

(a) the work done by the applied force,
(b) the increase in internal energy in the box–floor system as a result of friction,
(c) the work done by the normal force, (d) the work done by the gravitational force,
(e) the change in kinetic energy of the box, and
(f) the final speed of the box.