Answer the following question given this paragraph: 

Discussion for (a) This value is the net work done on the package. The person actually does more work than this, because friction opposes the motion. Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. Strategy and Concept for (b) The forces acting on the package are gravity, the normal force, the force of friction, and the applied force. The normal force and force of gravity are each perpendicular to the displacement, and therefore do no work. Solution for (b) The applied force does work.


Q: Friction does negative work and removes some of the energy the person expends and converts it to which kind of energy?

 Choices:

- erosion

- hydro

- evaporation

- thermal

A:
thermal
