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?
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.