dogdoc Posted October 25, 2005 Report Share Posted October 25, 2005 velocity x velocity x total arrow weight (in grains) divided by 450,240 your mass is going to be the total arrow weight including the raw arrow, fletching, nock, insert, and broadhead. Here is a website where you can just punch in the numbers and it will give you your KE: http://www.bowsite.com/bowsite/features/practical_bowhunter/penetration/index.cfm welcome to the forum! todd Quote Link to comment Share on other sites More sharing options...
1olhunter Posted October 31, 2005 Report Share Posted October 31, 2005 Re: kenitic energy The formula for mass is M=F/A Where: M = Mass, F = Force, A = Acceleration In order to determine the pounds mass of an arrow or bullet we first have to determine its weight in pounds. To do this, take its weight in grains and divide by 7000 (the number of grains in a pound). Example: 500 grain arrow its weights is 0.07143 lbs Now to determine the mass we divide its weight by the acceleration of gravity, which is 32.174 feet per second squared. Example: Mass of 500 grain arrow = 0.07143 / 32.174 Mass of 500 grain arrow= 0.00222 lbs mass To calculate the KE the formula is KE=.5 * Mass * Velocity Squared Assume the arrow is being shot at 250 fps KE = .5 * 0.00222 * 250 * 250 KE = 69.375 ft lbs of energy I hope you enjoyed the physics lesson. Quote Link to comment Share on other sites More sharing options...
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