A tennis ball reaches the ground after a 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 in 1971 on the Moon, where the acceleration from gravity is only 1.67 m/s2 and there is no atmosphere. This is a general characteristic of gravity not unique to Earth, as astronaut David R. If a ball is thrown upward, the equations of free fall apply equally to its ascent as well as its descent.įigure 3.26 A hammer and a feather fall with the same constant acceleration if air resistance is negligible. But “falling,” in the context of free fall, does not necessarily imply the body is moving from a greater height to a lesser height. 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. Let’s assume the body is falling in a straight line perpendicular to the surface, so its motion is one-dimensional.
0 Comments
Leave a Reply. |