Which of the following is not correct?
Select one:
a. Work occurs when a force is applied to an object through so that the object is moved some distance.
b. If a force is applied to an object but there is no displacement, then no work is done.
c. The work done by gravity is always negative.
d. The work done by a constant force is the product of the magnitudes of the parallel component of the
force and the displacement.
