In Newton's First Law of Motion states that an object at rest stays at rest while an object in motion tends to stay in motion unless a force acts upon it. When a player shoots in Basketball it would appear that there is nothing that is stopping the ball. If it wasn't for these forces, the ball would continue in the current direction. Gravity acts upon the ball pulling it down to Earth. Players might not realise that they judge the weight of the ball and the force of gravity to be able to find the right angle and force to use to make a basket.
In Newton's Second Law of Motion states that an acceleration is produce when a force acts on a mass. This Law is the most common in Basketball. The basketball has a certain mass which means the player has to use the appropriate amount of force when shooting or passing. Too much or not enough force being put into the ball will make it not go in the direction where it was intended.