Published June 2, 2023, 3:20 a.m. by Bethany
"Science of nfl football" is a 10-part video series funded by the National Science Foundation and produced in partnership with the National football League. In this segment, NBC's Lester Holt breaks down Isaac Newton's Second Law of Motion and how it can affect the flight of the football as place kickers shoot for the goal posts. Professors Tony Schmitz of the University of Florida and Jim Gates of the University of Maryland explain why it truly can be "hit or miss" when it comes to stricking a football.
Provided by the National Science Foundation & NBC Learn
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LESTER HOLT reporting: To be an NFL kicker takes more than just
nerves of steel and a strong leg.
It also requires help from one of the key laws of physics.
MORTEN ANDERSEN (Former NFL Kicker): It's easy to say,
well, I just kicked the ball.
Well, let's delve into it.
Let's look at the specifics.
What actually happens when you kick the ball and why does the
ball go where you ask it to go--and it is Newton's Second
Law--Second Law of Motion.
HOLT: The Second Law is one of three laws described in 1687 by
Sir Isaac Newton, who used them to describe how and why objects move.
JIM GATES (University of Maryland): The Second Law says
that if you have an object with a mass that is accelerating--and
accelerating means a change in velocity--that is equal to the
amount of force applied to the object.
The way we say it with words is F is equal to MA.
HOLT: This also means that in order for an object,
like a football, to accelerate, a force must be applied.
To illustrate Newton's Second Law in kicking,
we asked Morten Andersen, the NFL's all-time scoring leader,
to perform his craft in front of a high-speed Phantom camera.
The entire procedure unfolds in less than a second-and-a-half,
from snap ...
to hold ...
to kick.
ANDERSEN: It's all about training and rehearsing and
doing something over and over and over again.
HOLT: To reduce the chance of a block,
NFL kickers take just three steps to the ball.
The final step is with the plant foot,
which provides the stable platform for the kick.
ANDERSEN: I call it the moment of truth and the moment of truth
is basically when your plant foot hits the ground next to the ball.
You're either in the right position or the wrong position.
HOLT: The kick, itself, involves the entire leg building
the force necessary to launch the football.
ANDERSEN: It's a hammer, and when you swing a hammer,
you're thrusting it and it's going to be impacting the ball
with great velocity.
HOLT: An NFL kicker's foot is in contact with the ball for just
8-one-thousandths of a second--and in that time,
his foot applies up to a ton of force to the ball.
This quick, violent strike is a perfect example of what's known
in physics as an "impulse."
SCHMITZ: Impulse is an important concept because there is a
finite time over which the foot is in contact with the ball,
and during that time there is a force applied to the football.
HOLT: An impulse is equal to the force multiplied by the time the
force is applied, represented by delta-T.
If force is graphed versus time, it's possible to see how a
larger force, or a longer time for the force,
supplies a bigger impulse.
GATES: Since impulse is really just the change in momentum and
since the ball doesn't change it's mass,
we're really just talking about the change in speed.
The bigger the impulse, the bigger the change in speed,
which means the faster the ball is moving after it leaves the kicker's foot.
HOLT: Ironically, Andersen says the distance of the field goal
doesn't change his approach to the kick, itself.
ANDERSEN: Mentally, you want to look at a fifty plus yarder like
a forty yarder with some room to spare.
I think that's a good way to kind of fool yourself into
thinking it's a shorter kick.
HOLT: Whether the kick is short or long,
Newton's Second Law explains what an NFL kicker must do to
send a football through the uprights.
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