The Physics of Sports
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Transcript of The Physics of Sports
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The Physics of Sports
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Physics explains
things that are very,
very small.
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Physics explains things that are very, very large.
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Physics explains things that are right in front of us.
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Newton’s First Law
• Objects at rest remain at rest
• Objects in motion remain in motion
UNTIL YOU APPLY A FORCE
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Newton’s Second Law
F = ma
What forces are important in sports?
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Flight Path
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The Home Run Swing
• Ball arrives on 100 downward trajectory
• Andre Dawson and Frank Thomas swing up at 250
• Ball takes off at 350
The optimum home run angle!
Courtesy of A. Nathan, University of Illinois. http://www.npl.uiuc.edu/~a-nathan/pob/
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Newton’s Third Law
For every action there is an equal and opposite reaction.
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Conservation of Energy
Potential Energy
Kinetic EnergyKinetic Energy
Compression Energy
Heat and Sound Energy
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Conservation of Momentum
If m1 = m2 , then v1 = v2
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• Ball material, size, shape, and texture
• Properties of the club, bat, racquet, or stick
Equipment features
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How fast can you throw a
ball?
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Momentum transferredEnergy stored and released
David Rawlings, PGA Golf Professionalhttp://golflessonslondon.wordpress.com/
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Hockey Slap Shot
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http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/Daniel_Lenord/vault.html
Pole Vault Progress
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Air Resistance (drag)
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FRICTION
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Resistance & Friction
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The Power of Spin
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Spins in Figure Skating
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Reaction Time
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Downhill skier speed: 80 mph
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Reaction Time in Baseball
Courtesy of R. Adair through A. Nathan.
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Measure your reaction time…
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Compare your reaction time…
Equation used: t = √((2d)/g)
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Physical laws explain the world
• Newton’s Laws of Motion• Conservation of Energy• Conservation of Momentum
These laws help us explain everything about sports, but there is more to learn.
Physics really is everywhere!
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Visit Fermilabwww.fnal.gov
• Buffalo viewing
• Bicycling
• Walking
• Roller blading
• Canoeing
• Fishing
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Visit Fermilab
• Lederman Science Center
• Tours
• Saturday morning physics
• Ask a Scientist
On-line activities:ed.fnal.gov
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The Physics of Sports