Bouncing

     While dribbling a basketball, the ball comes back up. This is because of the collision between the air molecules in the basketball and the ground. When the ball hits the ground, the bottom hitting the ground has a "dent" in it. Air is a gas. In gases, the molecules move freely and bounce and hit each other. When the ball is "dented," the air molecules get packed into a tighter space. With this smaller space, the molecules move and bounce off each other at greater speeds. This greater speed pushes against the wall of the basketball and forces it to its original size, which causes it to bounce. 1) "This proves Newton's Third Law, which states that for every action there is an equal and opposite reaction. Which explains why when the ball is pressed in by the floor, the ball exerts an equal and opposite force and bounces back upwards."
     Hurling a basketball down creates a the same power going back up, which proves Newton's Third Law. However, the basketball doesn't reach back to its full height. This is due to the forces of air pressure and gravity.