Sixth-grade students are working in groups to deepen their understanding about the motion of objects using examples from everyday situations. In previous lessons, they studied the concepts of force, displacements, and work. The next task for the sixth graders is to choose examples from everyday life that illustrate examples of "work" being done on an object. Which of the following examples does not illustrate an example of "work" being done on an object?
a) Pushing a shopping cart through a grocery store aisle.
b) Carrying a backpack up a flight of stairs.
c) Holding a book stationary on a desk.
d) Kicking a soccer ball across a field.
