John applied 20N of force to a bag of dog food while walking up a 6.0 m flight of stairs. How much work was done on the bag?
You push down on a 3.0 N box for 10 minutes. How much work was done?
a) work = force.displacement = 20 x 6 = 120 J.
b) You did not move the box, the displacement was zero. Hence the work done is 0 J.