physics and football
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Physics and Football. BY: Ian Ramdeen , Chris, David, Evan Harrison, and Brent Richardson. Football. American football is obviously popular in the U.S., especially in the South. - PowerPoint PPT PresentationTRANSCRIPT
Slide 1
Physics and Football
BY: Ian Ramdeen, Chris, David, Evan Harrison, and Brent
Richardson
Football
American football is obviously popular in the U.S., especially in
the South.Did you know that physics can also be found in football
such as a football being a projectile, momentum of a player, force
applied in a tackle, and forces used in a kick?
Projectile in football
A projectile is any object that can be thrown.In football
quarterbacks throw the football for several miles at quick speeds.
If a quarterback wants to throw a long pass, then he is going to
have to throw at the right angle and right velocity.
Practice Problem
If a quarterback throws a football at 20m/s and at an angle of 60
degrees, how far did he throw the ball?Formula: R=Vo^2 sin (2
theta)/gTheta=60 degrees V=20m/s G=9.8m/s^2 Solve for RSolution:
R=20^2 sin (2*60)/9.8400sin(120)/(9.8)=35.348 meters
Momentum
Everyone knows that momentum is a measure that is equal to mass
times velocity.This applies to football in this manner because
football players of different sizes are running at fast
velocities.
Physics Problem
If a 125 kg (275 lb) lineman is running down the field at 9.8 m/s,
what is his momentum.Formula: p=mvM=125 kg v=9.8 m/sFind p
(momentum)Solution: p=125 (9.8 m/s) =1225 kg-m/s
Tacking and Impact
One of the biggest concepts of physics applied to football is
force. A force of a tackle can have huge impacts. If the impact of
the tackle is huge, that can a serious injury. If a running back is
running with a huge momentum, a sudden tackle can come as a huge
shock.
Physics Problem
If a running back has a momentum of 950 kg-m/s, and the tackle
occurs in .6 seconds, what would the force of the tackle
be?Formula: F=impulse/tImpulse (Momentum but written as impulse in
this case): 950 kg-m/st=.6 secondsFind the ForceSolution: F=(950
kg-m/s)/ (.6seconds)=1583 N
Physics and kicking
Physics especially applies to the instance when a placekicker is
trying to make a field goal. He has to make adjustments in order to
make the attempt. He has to kick the ball at the right angle and
has to kick the ball with a good force. He also needs to kick the
ball well, so a good acceleration will enable the ball to go
through the goal post.
Physics Problem
A place kicker must kick a football from a point 40 m from the goal
and clear the crossbar 3.05 m high, and the ball leaves the ground
with a speed of 25 m/s at an angle of 50 degrees to the horizontal
at an acceleration of 9.8 m/s. How long does the ball stay in the
air?Formula: D=ViT+(1/2)A(T^2)Given Vi=25m/s A=9.8 m/s D=40m
T=?40=25(T)+1/2(9.8)(T^2)4.9(T^2)+25T-40=0 (multiply each side by
10)40=25(T)+4.9(T^2) =-250 +/- the square root of 140900 divided by
98.
References
http://www.lcse.umn.edu/speces/labs/catapult/index.htmlhttp://entertainment.howstuffworks.com/physics-of-football3.htmhttp://answers.yahoo.com/question/index?qid=20080930092439AA1Sgc8