Hypothetical question

[Keenan]

I was reading the thread about (MY bow is so fast) and I pondered a thought, What if you shot, (backwards) out of the back of a truck that was travleing at the same speed as your bow shoots. To a bystander watching along the road ,Would the arrow just apear and fall striaght down to the ground?
 In theory if the speed was matched,Would the the forward motion of the bow cancle the motion of the string moving towards the rear of the truck?
 If so is it the bow that is fast or the arrow?   Maybe I should have some more coffee.   Keenan

[woodchucker]

Keenan, Your thinkin' to much again..... Why don't you grab your bow and go shoot some arrows LOL

[BigRonHuntAlot]

At 55 mph your vehicle is traveling at about 80 fps. Just think how fast you would be driving to find out.  

[bbassi]

Originally posted by BigRonHuntAlot:
At 55 mph your vehicle is traveling at about 80 fps. Just think how fast you would be driving to find out.    

LOL! Sounds like a Darwin Award in the making...

[bentpole]

gettin a headache just readin that lol

[pointy sticks]

I've seen this question before somewhere. I beleive the correct answer was prove(mathmatically) to be that the arrow would fall to the ground at point of release. Simple because they would cancle each other out.

[sar]

fall to the ground if shot backwards, double your fps if shot forward(assuming vehicle and arrow fps are the same)

[Hood]

But what if you had a tail wind twice the speed of your truck?  

[mcgroundstalker]

Arrow Speed X 3763097563587 + 2/3 of Vehicle Momentum X (arrow weight) plus ratio of 994562 @ a standard/varied/nevermind/ of 62% vertical lift = tire size minus your last haircut...round out the road conditions...invert 4/5s of the total number in rolls of toilet paper used yearly...add 974625 sq....divide by 11-teen and you get half the answer...

GOT IT NOW?...My oh my...You guys are sumthin'

>>-----> mike <-----<<    :D

[pointy sticks]

Holly smokes I never knew just how mathmatical it was. Thanks now my brain hurts LOL

[Hot Hap]

Where`s Marilyn vos Savant when you really need her? Hap

[vermonster13]

The answer is no. There are more forces in play than the momentum of the truck and bow.

[Keenan]

Mike:that was great! made me bust a gut!
 
 Pointy sticks; If so then we would be inclined to think that the bow is moving backward and the string nock is stationary at the point of release,,,,,Then at the precise point of seperation of nock and string (Brace H) the string would then accelerate backward with the truck,,,,Would the friction of the nock pulling away from the string be a factor???
 Ok maybe I better wander back out to the shop and give the brain a rest.......LOL    Keenan

[Killdeer]

"Where`s Marilyn vos Savant when you really need her? Hap"

 

[loco_cacahuate]

That means that if you shot in the direction of travel the arrow would stay on the string?  :confused:    :confused:    :confused:    

[Tater John]

If your truck is traveling at 160 FPS slower than the speed of light. You shoot an arrow in the direction of travel at 161 FPS. Will the arrow disappear?  Rusty

[dino]

I'll second the Darwind Awards!  I have the site bookmarked to keep an eye on it, this could be a winner. dino

[infosponge]

Vermonster is correct. There are more forces at work in an equation like that.

Remember, energy is never lost, it's absorbed. Knowing this to be true, the bow is also moving as fast as the truck, but it has stored energy when drawn. Obviously upon release, that energy is imparted onto the shaft. Now the shaft has a large percentage of that stored energy that was in the bow. Therefore one has to surmise that when that shaft is subjected to the forces of release and absorbing all that energy, with a tailwind of 160fps or so (if winds were calm that day) then the arrow will definitely leave the bow with a measurable amount of velocity. Sufficient to at least travel beyond the bow and shooter.

[DarkeGreen]

I say if you are traveling 160 fps and you shoot an arrow out the back (towards the rear of the truck)at 160 fps the following will be true. One second after release the arrow will be 320 fps away from the point of release.  

BTW, they shoot cross bows from moving helicopters to dart animals. You could watch a few of the video and see what happens.

[Keenan]

Sounds to me like we need some good ol down to earth testing.
 First we is gunna need a jacked up redneck 4x4  with the blown moter and all to be able to get them high speeds matched up. Then we's gunna need a lazy boy in the back to be saftly fastened in.  
 Next a good long country road so we dont be breakin no laws and plenty of mud holes to keep the crowds happy.
 We is gunna be havin a raffle to see who gets to hold the conograph fer the forward test and a couple spotters fer the backward test.
 And to keep things going along smoothly we is givin everybody arrows with rubber blunts to try and hit the bulleye on the truck as it flys by.   LOL sounds like the start of an anuall outing...Keenan