## NFL SCIENCE

From big, bulldozing to small, speedy NFL running backs come in many

shapes , sizes but to succeed at football all wedding backs must excel at

kinematics. The branch of classical mechanics that defines how objects move because kinematics describes motion.

It describes everything in NFL running back does basically which is his motion up

the field as he tries to score kinematics, uses three concepts to define

motion position velocity, acceleration position defines location

within a space, such as the surface of a football field position would be a

running back to the location on the field. He can change that with his

motion in this play let’s define the running backs position where he takes

the ,off after executing the play however his new position is his

opponent’s endzone.

The position relative to the goal line

changes the set of options that the running back has in terms of the

direction he chooses to run a second kinematic concept is velocity which

describes both the direction, speed of the running back in the NFL one way

speed is measured is a player’s time in the 40-yard dash a long long time ago

almost right at ten years ago a 40-yard dash was 426 to help.

illustrate the concepts of kinenew orleans nfl american footballmatics deuce mcallister all-time leading rusher

for the New Orleans Saints ran the 40-yard dash in front of a high speed

phantom camera you want to stay low as possible while running the 40

particularly the first ten yards so it’s literally like you’re being shot out of

the cannon using.

McCallister’s personal best in the forty four point two six

seconds it’s easy to calculate his speed divide the distance by the time to get

his average speed nine point three nine yards per second or twenty-eight point

one seven feet per second to define the velocity simply add a direction twenty

eight point one seven feet per second north when we talk about speed we’re

talking about the magnitude of velocity, then its direction is dictated by

where the running back goes on the field great speed is used to elude tacknfl national fotball leaguelers

when you have speed, you have very good speed that five-yard plate for most

backs become becomes a 50-yard play also helpful is the ability to cut or

suddenly change directions that helps you make moves against the defender to

helps you stay free fleeing tackle beyond position, velocity the third.

kinematic concept is acceleration which describes how fast speed is changing you

never know when you may need to hit that button you know per se to accelerate at

maximum speed to unders, acceleration consider again

.

McCallister‘s 40-yard

dash while his average speed is twentyeight point one seven feet per second

his instantaneous speed varies . He starts with zero speed, that

increases his speed or accelerates until he reaches a top speed let’s say

hypothetically 31 point 5 feet per second if we know how long it takes

McAllister to hit his top speed let’s assume 1.2 seconds then it’s possible to

calculate his acceleration as the change in speed divided by the time

acceleration is the change in velocity per unit time which with blue

comparative velocity was the change in this distance per unit time in this case

31 point 5 feet per second divided by 1.2 seconds means that McCallister’s

acceleration was 26.2 5 feet per second squared we want to reach our top

velocity as quickly as possible someone with very low acceleration might take 5

yards to reach top velocity while someone with great acceleration might be

able to reach top velocity, pass that distance on the playing field

acceleration or the ability to reach top speed quickly maybe a running backs most.

potent weapon if you can accelerate you’re going to get the top speed even

If your top speed isn’t as fast as the guy that’s faster than you you’re going

to beat him to his top speed therefore you’re going to be more successful than

he is without kinematics, it’s concepts of position velocity,

acceleration NFL running backs would be easy prey, football itself wouldn’t

be nearly as fun to watch.