Gymnastics is a sport consisted of four different events, each of which test a different element of ones physical ablities and skill, including stregnth, flexibility, endurance, skill, and form. Uneven bars is an event in which physics is involed. Acceleration and gravity effect how you swing and how high you can get you get on bars. For example, in order to do a giant you have to be able to use gravity to gain acceleration and go around the bar along with your form. In order to work on bars you must accomadate for gravity and use it to your best ability.
You learn to project yourself and work agaisnt it to get the best result possible.