Newton's Laws of Motion 

NEWTON'S FIRST LAW An object at rest remains at rest, and an object in motion moving in line with a steady velocity if it is not acted upon by other forces. A gymnast is using their own force to propel around the bar, and will not stop moving until the force is stopped.

NEWTON'S SECOND LAW When force acts on a body it produces an acceleartion proportional to the magnitude force. F=ma In theory, the heavier the gymnast is, the more force she will have. This law really only applies for vault or floor, and of course the weight of the gymnast is mostly muscle.
Alicia's force while running to the vault is: F=(53kg)(1.3m/s^{2}) F=(68.9N) (Acceleration was found by finding her velocity. She ran 21.3 meters in approximately 4 seconds, therefore her velocity was 5.3 m/s. That number was divided by 4 to find her accerleration, in m/s^{2)} 
NEWTON'S THIRD LAW For every action, there is an equal and opposite reaction. This law is crucial for events such as floor. When a gymnast bounces on the floor, it gives an equal and opposite reaction back and propels the gymnast.
