I read in my mag last night that speed is more of a factor than the weight of your arrow when it comes to KE..is this common physics?
I believe that is true but, speed is less of a factor than weight when it comes to momentum. Myself, I go for momentum.
Yeh I guess when it comes to short range the speed would be the factor more so than at longer ranges??
Does this help .... Beginning students often confuse kinetic energy and momentum. Kinetic energy and momentum are NOT THE SAME! Scalar Versus Vector: An important difference is that momentum is a vector quantity - it has a direction in space, and momenta combine like forces do. Kinetic energy is a scalar quantity - it has no direction in space, and kinetic energies combine like "regular numbers". Dependence on Velocity: The momentum of an object is proportional to the object's velocity - if you double its velocity, you double its momentum. The kinetic energy of an object is proportional to the square of the object's velocity - if you double its velocity, you quadruple its kinetic energy. This has important consequences... A Thought Experiment: Suppose that you were captured by an evil physicist who gave you the following choice: You must either: Stand in front of a 1000 kg truck moving at 1 m/s, or Stand in front of a 1 kg meatball moving at 1000 m/s. What's your choice? Hopefully, you picked the truck! It's a big truck, but it is moving rather slowly (about walking speed), so assuming you don't fall down when it hits you (That would be bad...) the truck is just going to bump into you and move you out of the way. On the other hand, you probably suspect intuitively that the meatball is a very dangerous object. It isn't that massive, but it is moving very fast (about 10 football fields per second) - and when it hits you it would do considerable damage to you, and keep going! Consider the momentum and kinetic energy of the truck and the meatball: Truck: Truck's momentum = mv = (1000 kg)(1 m/s) = 1000 kg m/s Truck's kinetic energy = 0.5 mv2 = (0.5)(1000 kg)(1 m/s)2 = 500 Joules Meatball: Meatball's momentum = mv = (1 kg)(1000 m/s) = 1000 kg m/s Meatball's kinetic energy = 0.5 mv2 = (0.5)(1 kg)(1000 m/s)2 = 500 000 Joules We know intuitively that the meatball is more dangerous than the truck, yet the momenta of the truck and the meatball are the same. On the other hand, the meatball has 1 000 times the kinetic energy of the truck! Clearly, momentum and kinetic energy tell different things about an object! :d
Ok Landon, this might help a little more :d http://www.huntersfriend.com/2007-Carbon-Arrows/arrow-selection-guide5.htm
I don't buy into the whole KE thing. A light fast arrow is going to wash off speed faster than a slower heavier arrow.
For hunting arrows I go for momentum. For 3d, Deb gave me some light weight arrows that aren't much more than long straws with fletch on them. They're fast... but touchy as heck and they barely poke into the foam compared to my much heavier hunting arrows.
