In quidditch, there are multiple examples of this. Take the quaffle for example. Unless picked up by player, passed around, or saved by the keeper, that ball will not move according to gravity and fluid friction.
Along with that, you have your brooms. Brooms, unless "magic" is used upon them or are ridden by one of players, they will stay inactive and therefore, just won't move.
Newton's Second Law of Motion explains how force, mass, and acceleration are related. The value of acceleration will increase if the force increases. This can also happen if the mass of the object you are applying force too is decreased in weight altogether.
This law can be found in quidditch when a beater strikes a ball with their club. When it is zooming to hit one of the other players, the beater shall hit the bludger with their stick, forcing it away as it accelerates in another direction.
Newton's Third Law of Motion describes that with every action, there's an opposite force. One of the most obvious is the snitch. In the fictional world of Harry Potter, the snitch whizzes around, seekers trying to catch it to win the game for their team. The snitch itself has wings, and when it flies, the wings push down on air, which is a fluid. While they push down and change direction or speed, the air is pressed down.