The answer is C. Potential energy
(I learned this in class recently)
Positive - Friction allows us to create heat in a desperate situation, like being lost in the woods. If we didn't have friction, we would probably freeze to death.
Negative - Friction can also cause unwanted fires, such as forest fires. If friction didn't exist, we wouldn't have these.
Answer:
a) It reduces the kinetic energy loss of the stunt person.
