|MLA Citation:||Bloomfield, Louis A. "Question 764"|
How Everything Works 15 Jul 2018. 15 Jul 2018 <http://howeverythingworks.org/print1.php?QNum=764>.
Among the many consequences of such a change would be that energy wouldn't be conserved—you would be able to create energy out of nowhere. To see how that would be possible, imagine lifting a heavy object and suppose that as you pushed upward on it, it didn't push downward on you. As you lifted it upward, you would do work on it—you would exert an upward force on it and it would move upward. But it wouldn't do negative work on you—it would exert no force on you as your hands lifted it upward. As a result, its energy would increase but your energy wouldn't decrease. Energy would be created. In fact, you wouldn't even notice that you were lifting it because it wouldn't push on you as you lifted it.