![]() A tennis ball will reach the ground after a hard baseball dropped at the same time. In the real world, air resistance can cause a lighter object to fall slower than a heavier object of the same size. Scott demonstrated on the Moon in 1971, where the acceleration due to gravity is only 1. ![]() This is a general characteristic of gravity not unique to Earth, as astronaut David R. This experimentally determined fact is unexpected, because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavy ones.įigure 2.37 A hammer and a feather will fall with the same constant acceleration if air resistance is considered negligible. The most remarkable and unexpected fact about falling objects is that, if air resistance and friction are negligible, then in a given location all objects fall toward the center of Earth with the same constant acceleration, independent of their mass. By applying the kinematics developed so far to falling objects, we can examine some interesting situations and learn much about gravity in the process. For example, we can estimate the depth of a vertical mine shaft by dropping a rock into it and listening for the rock to hit the bottom.
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