Convert 55lb-65lb Draw Weight to 1/2kx^2

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To convert draw weight from pounds to the formula 1/2kx^2, use pounds-of-force directly with feet for x, resulting in energy measured in foot-pounds. For energy in Joules, convert pounds to Newtons using the conversion factor of 4.445 Newtons per pound and use meters for x. The discussion highlights the successful application of an alternative method involving arrow velocity to achieve the desired results. This approach demonstrates the flexibility in calculating energy based on different parameters. Understanding these conversions is essential for accurate energy calculations in archery.
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I'm Canadian, and I'm trying to convert the draw weight (55lb-65lb) into something I can put into 1/2kx^2. Please help!
 
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You can use pounds-of-force directly and using feet for x, so long as you are happy with coefficient k being in pounds/foot, which are standard imperial units for spring coefficient.

Keep in mind that you'll get energy in foot-pounds. If you want to get energy in Joules, you should use meters for x and convert pounds-of-force to Newtons. There are 4.445 Newtons to a pound.
 
okay thanks, I actually tried using a different method of finding it, using the velocity of the arrow, and it ended up working
 
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