Final answer:
When a football quarterback throws a football, the forces acting on the ball include the force applied by the quarterback, force of gravity, air resistance, and friction.
Step-by-step explanation:
When a football quarterback throws a football, there are several forces acting on the ball:
- Force applied by the quarterback: This is the force exerted by the quarterback on the ball when he throws it.
- Force of gravity: This is the downward force that pulls the ball towards the ground.
- Air resistance: This is the force exerted by the air on the ball as it moves through the air. It opposes the motion of the ball.
- Friction: This is the force between the ball and the quarterback's hand. It helps the quarterback grip the ball and propel it.
These forces together determine the motion of the football after it leaves the quarterback's hand.