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Coming down the court, a player jumps and the laws of physics take over. These laws state that every action has an equal and opposite reaction. What this means in layman's terms is that the player pushes against the floor and the floor exerts a force back. This action/reaction makes the player to leave the floor. When a player pushes harder on the floor, the floor pushes back harder causing the player to be propelled higher.
If a player is running during the jumping process, his/her center of mass follows a parabolic course, which in essence looks similar to a rounded off mountain top. A persons "center of mass" is situated near their midsection. This means that, if the person were to stay in exactly the same position for the duration of the entire jumping action, his/her midsection (and consequently, complete body) would follow this route. However as a player jumps while running, the center of mass is lifted - and manipulated.
By raising his knees, he's raising his center of mass relative to his head. He does that on his way up. As he comes back down then, he puts his legs back down. This makes his center of gravity lower. This in effect raises his head in relation to the center of mass. The head does not follow the parabolic path. The head stays at one height.
So what you get is for a portion of the period in the air, the head stays at the same height, but ,during the whole time the center of mass goes up and down.
In essence, the player's head is the key to why we believe in hang time.
While we look at each other, we don't customarily look at the person's "center of mass". We frequently concentrate on a person's head (or at least the upper part of the whole body) . What happens at that second is a bit of an "illusion", but it really is happening. The person's center of mass is changing and this causes his head to stay in the same position for a longer time.
Well, if "hang time" is not genuine, how is it that one person can continue in the air longer than another person? The REAL solution is because that person JUMPS HIGHER. If you can't increase your hang time then, you have to learn to jump higher!
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