When the football travels through the air for a long pass it always follows a curved path because the force of gravity influences the movement of the ball in the vertical direction. As the ball travels up, gravity slows it down until it stops briefly at its peak height; the ball then comes down, and gravity accelerates it until it hits the ground. Projectile motion is the path of any object that is launched or thrown and has an arched course (howstuffworks)
For the football to travel the most accurate and furthest distance, the ball must have the tightest spiral it can develop. "This will influence how the ball slows down in flight, because the ball is affected by air drag (howstuffworks)." A spiraling throw will have less air drag, will not slow down as much and will be able to stay in the air longer and go farther than a wobble throw. The velocity of the ball and the angle of the throw are the major factors that determine the path of the ball. Vectors are also involved in throwing a football because a vector is the direction in which you are throwing. Also when throwing on the running. For example the quarterback rolls out at a speed of 5m/s and after he twist his body to throw down field the vector is now at an angle of 75 degrees, so the quarterback must understand the speed he is running at in order to make an accurate throw (physics.unl.edu).
Ø The football has a more streamlined design and consequently has less drag, allowing the ball to move more easily through the air.
Ø Launch speed
Ø Launch angle
Ø Air density and wind
Ø Spin of football
Ø The faster it rotates the more velocity it has, the farther it goesd
Hitting and tackling the running back
Newton's third law of motion says if two objects interact, they exert opposite and equal forces on each other. So when players collide, the force of the impact is distributed equally between them. "The foam and plastic padding that players use to arm themselves against injury... [continues]
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