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Why' Physics, a branch of science, is traditionally defined as the study of matter, energy, and the relation between them. The interaction between matter and energy is found everywhere. In order for matter to move, it requires some form of energy. Sports show many good examples of the relationship between matter and energy. For instance, a pitcher requires energy to throw a baseball at the incredible speed and accuracy that is needed to keep the batter from using his energy to try and hit the ball. The batter exhibits the need for a certain trajectory because he/she needs to hit the ball hard enough and keep it high enough to sail over the outfield wall. On the other hand, the batter must be certain to keep the trajectory low enough so that the ball will reach the fence. Trajectory is also seen in basketball, where players must shoot the ball with enough arch to get over the front of the rim, and go through the hoop. The energy required to do this comes from not only the arms, but the legs as well. The medical field has seen enormous breakthroughs because of principles of physics. Doctors are now able to use lasers for surgery. Lasers are based on the physical principle matter, physics, energy, universe, light, field, enough, dark, because, ball, trajectory, principles, new, keep, between, batter, based, able, ultrasound, theories, show, seen, scans, requires, over, never, need, must, medical, lasers, intense, hit, he/she, extremely, certain, body