Newton’s first law states that an object in motion tends to stay in motion, and an object at rest tends to stay at rest, with the same speed and direction, unless an unbalanced force act upon it. This law occurs during a football throw. When the ball is in the air there is no force being applied horizontally, but the ball still continues to move horizontally with a constant velocity until I caught it. According to the second part of the law, an object at rest tends to stay at rest unless acted upon by an unbalanced force. This explain why when the football has no horizontal velocity when it at the thrower's hand, because there no unbalanced force acting upon it. when thers's an unbalanced force acting upon the ball which in this case is the thrower, it cause the football to leave its resting state and accelerate. We know this occurs because we see the ball start to moves as soon as it left the thower's hand. this means that as soon as an unbalanced force is applied to an object, it changes the object from resting to moving.