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Physics of Javelin Throwing

Physics Stuff
by

Josh Cook

on 8 January 2013

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Transcript of Physics of Javelin Throwing

PHYSICS
OF JAVELIN The objective of Javelin is to hit specific targets... ...even by riding horse back,
attempting to hit moving targets Hi! But where did this great sport come from? It was in the year 708 B.C. where this sport originated, ...a way to express everyday lifesytyes ...and to the depths of human warfare. Derived from hunting in the forests... It was just a matter of time before competitions would occur. 708 B.C. First Javelins But this sport has changed drastically over the years. Olive Wood 400 grams 2.3-2.4 meters long 1953 Redesigns Javelin (Hollow) Pre-Modern Era Hickory Wood 800 grams 2.3-2.6 meters 2012 Modern Day 1780 27% more surface area Franklin Use metal/wood variations Javelin Timeline By Kelly Peterson and Josh Cook History of Javelin Throwing Javelin orriginated from spears,
capable of being thrown great distences. History of Javelin Throwing In the beginning there was a man.
This man was named Hercules. Hercules, ancient belief to have created
the olympics, founded many of sports. Thus given credit for creating Javelin Throw the javelin as
far as you can. What are the
RULES? Competitors take 3-6
throws. Normally it is
3 throws. The best legal throw
is recorded. The winner is the individual with the
longest legal throw measured to
the nearest centimeter. The javelin's point must touch the ground
first for the throw to be legal. But is there anything else
you need to know? You need to pick a javelin that applies to your gender and age. MALE FEMALE 11-12 13-14 15-16 17-19 ADULT 400g 400g 600g 600g 700g 600g 800g 600g 800g 600g You also need to
know what kind of
grip suits you. There are
3 different types of javelin grips. This is the
1st type of grip and
probably most popular. This is called the 'V' grip
and is probably the best
for beginners. But out of these three,
the most important thing
is to pick the one that is
the most comfortable for you. :) So what do you
need to do? The weight should be over the rear leg. Hips are forward and the feet should be in line with the throwing direction. The throwing arm is held parallel to the ground, long and relaxed with the palm uppermost. The rear leg drives the hips to the front, transferring the weight from one leg to the other. NEWTON'S 3 LAWZ The arm is brought in
FAST and LAST. Thou object in motion shalt stay in thy motion
(unless an external force is applied to it) The elbow should be kept high and
close to the head, with the javelin
being thrown over the top of the head. Thy direction of the force vector is the same as Thou direction of the acceleration vector.
(Force = Mass * Acceleration) So what is the
main objective? For every action there is an equal and opposite reaction. How is impulse involved
in javelin? Think of it this way... Impulse is defined as a force
multiplied by the amount of
time it acts over. Which throw do you think will
go further? If you throw the javelin
limply over your shoulder for
an interval of .5 seconds? External Forces Or if you throw the javelin from
as far as your arm can extend
back for a 1-2 second interval? Force of Air Force of Friction If you guessed the second choice,
you are correct. The longer time interval you have and the greater distance and force you exert will result in a better javelin throw. What does projectile motion
have to do with javelin? IN-TERNAL FORCES It has EVERYTHING
to do with javelin! Projectile motion is involved in javelin
because that is the motion between the
athlete throwing the javelin and the
javelin touching the ground. :) Acceleration and....
JAVELIN So what about Distacnce? Experiment #2 The More momentum (running speed) you have,
the greater the force of the javelin is! 1st Experiment Acceleration is simply the increase
or decrease of the javelin being thrown...
in air.... or in space. Scientific Stuff Athletes used light javelins instead of military ones
for events were for distence instead of hunting. Becoming a strong tradition across Europe today. where primitive hunters were seeking food Built for Hunting Sport Which thowing pose is Best? Conclusion? Standing 1-Step Running Start SO... Force = * Force = * * Force = *** As you can tell,
the force increases by the amount of speed the runner gets Finally, how far does the stick go? By standing... By Stepping Forward 1 Step... AND by running... Let's blow up a gummy bear...
FOR SCIENCE! Le Fin... Standing 1-Step Running 49-53 meters 50-55 meters 58-64 meters In conclusion... If you add more force to the throw by adding thrust to the arm + speed by running faster,
the Javelin will go father.
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