Post a Comment. February 24, It's said that Robin Hood once split an arrow clean in half and William Tell shot an apple from off the top of his son's head. If these feats of marksmanship don't impress you, than check some of these guys out.
Archery has been around since the Stone Age, and is chock full of physics. You may ask: How'd They Do That!? The short answer is: "Years of practice. The moment you start pulling back on a bowstring, potential energy is stored in the flexing limbs of the bow. The instant you let go of the string, all of the stored energy is transferred instantly into the arrow , sending it flying down range.
Arrows fly pretty fast and in the video you can see how much a stiff arrow flexes after its shot, so you can tell there is a lot of energy in them. So much energy in fact if you dry fire a bow, it can shatter. You may wonder, if your arm is the source for all this energy, how come the results are much less dramatic when you just throw the arrow?
The amount of energy needed to move the string at high speeds is much less than the amount of energy needed to move your heavy arm at the same speeds. Your body can't generate the huge amount of energy needed to move the combined mass of your arm and the arrow at speeds over ninety meters a second. Easy stuff to understand, right? When you draw back the bowstring, you use your muscles to exert a force on the string that bends the limbs backward.
Oh, but wait…what about the physics? Ah, here it comes. The greater amount that you deform the limbs by pulling them back further in your draw length, the more you increase the force that in turn increases the stored potential energy.
However, with an arrow nocked on the string, much of the stored energy is transferred to launching the arrow — though some of the energy remains in the bow.
Nock an arrow first. And how do different styles of bows convert different amounts of their stored potential energy? Ah heck, simply telling you would cheat you from the fun of exploration and discovery.
Simply download either PDF below. Everything you need expect some test bows and arrows is contained to equip teachers and students with detailed steps to work through the learning exercises.
It requires some interesting online research, group evaluations, fun imagination, and thought-provoking discussions. Science Newsletter:. Full List of our Videos. Teaching Biology? How to Make Science Films. Read our Wildlife Guide. On the Trail of the Egret. Tips for Shooting Smoke Grenade Photos. Pacific Sleeper Shark: Giant of the Deep.
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General Physics Behind a Bow There are many mechanics to a bow, but the main physics of it is the force and energy that is excreted into pulling it back and letting it go. But this is an overestimate.
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