How gravitational potential energy is stored in a mass
a.) Lift a book from the floor to the table at constant speed. Did you do work? Why
or why not? If so, was the work you did positive or negative?
b.) Consider the same case as Part (a). Does gravity do work on the book? Why or
why not? If so, was the work gravity did positive or negative?
c.) What if you carry the book horizontally as you walk across the floor at constant
speed? Did you do work then? Why or why not? If so, was the work you did
positive or negative?
d.) How does your answer to Part (c) change if your speed increases? Decreases?