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					Physics of Shooting a Bow and Arrow




              John Willis
              Driving Question

What really happens when a bowstring from a drawn
 bow is released?
                         The Bow

   Bows come in many varieties – they could be made of
    wood, fiberglass, or spring steel.
   Their main function is to store high amounts of potential
    energy and to release it into the nocked arrow as kinetic
    energy.
                      The Arrow

• Arrows are typically made of wood, aluminum, or carbon
  fibers.
• They are the ammunition for the bow.
• In pastimes, they had stone tips, but now they have
  aluminum tips that are changeable.
                          Physics

• The bow, when pulled back, stores massive amounts of
  potential energy. That potential energy is immediately
  converted into kinetic energy when the bowstring is released
  by the archer.
• When the kinetic energy forces the arrow forward, the arrow
  travels in the shape of a parabola. This is because the force
  of gravity is working against the force of the arrow, just like
  everything else it works against.
                          Physics

• Air works as a liquid to an arrow. This means that air
  creates drag for the arrow. Drag is a force that prevents
  something from moving; similar to friction.
           Newton’s Laws of Motion

• Every object persists in its state of rest or uniform motion in
  a straight line unless it is compelled to change by forces
  impressed on it.
• Force is equal to change in momentum (mV) per change in
  time. For a constant mass, force equals mass times
  acceleration. F=ma
• For every action, there is an equal and opposite reaction
                                Citations

"Bow and Arrow - a History." Bow Hunting (bowhunting) & Bow Fishing
   (bowfishing) from ATHA Online Texas. Web. 10 May 2010.
   <http://www.athaonline.com/bow-and-arrow.html>.
"Arrow Flight." Physics Mr. Fizzix Mr. Physics High School Physics of Projects. Web.
   10 May 2010. <http://www.mrfizzix.com/archery/aero.html>.
"The Bow." Physics Mr. Fizzix Mr. Physics High School Physics of Projects. Web. 10
   May 2010. <http://www.mrfizzix.com/archery/bow.html>.
"The Bow." Physics Mr. Fizzix Mr. Physics High School Physics of Projects. Web. 10
   May 2010.
   <http://mrfizzix.com/archery/types.html>.

"Newton's Laws of Motion." NASA - Title... Web. 13 May 2010.
  http://www.grc.nasa.gov/WWW/K-12/airplane/newton.html.

				
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posted:7/30/2012
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