Homework Help: Science

Posted by Anya on Wednesday, March 6, 2013 at 12:45am.

A box that is initially at rest is pushed by a person at an angle 0 with a force F until it reaches a speed of v. The coefficient of kinetic friction between the box and the surface is U.

Is this:
work done by person equal to magnitude of friction F
work done by person greater than mag of friction force
work of person greater than change of K energy of box
kinetic energy gained by box greater than energy dissipated by friction?

Science - drwls, Wednesday, March 6, 2013 at 1:27am
The first two choices are wrong because force and work are two different physical quantities. The fourth choice depends upon the amount of friction.

The third choice is correct.

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