Dynamics: Lesson 6 - Projectile Motion Misconception - Funny

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[@EbiSadeghi]

But Dr. Hanson, doesn't everyone hunt with rocket-propelled arrows?

[@khairulanwar7642]

lol

[@initiald975]

sort of, but we ether catagorize these people as terrorists or the military!

[@thanasistheofilopoulos803]

That one dislike is from the hunter who doesn't physics.

[@xuticx]

This was a hilarious break for the playlist. When the hunting manager said that I died laughing.

[@23StudiosSports]

He said it with so much confidence though!

[@Ayrton-Da-Silva]

glad to see you keeping with the dynamics lessons!!!

[@acappuccitti1]

Keep posting Dynamics Lessons! You're our savior here!

[@rossjr6739]

Your Maine accent is perfect. Also, thanks for all your videos, they've been a huge help

[@doubletrouble7880]

Damn, you have a natural gift of teaching, best teacher on the Internet!

[@drewparfly97]

Thank You Professor For The Lessons.. It Really Helps Me to Understand Every Lesson you Teach. All the Way from The Philippines ;) More Power!

[@kylejohnson8447]

lmao he said that with such confidence!

[@georgesadler7830]

DR. Hanson ,thank for another short dynamics lecture.

[@tahagargoum6247]

You are the best Dr.Hanson in both you helped me a lot in Statics and Dynamics Appreciate your time spending for us Thanks

[@edinalibasic142]

Hahah, that was a good one. Please keep posting dynamics professor Hanson. You’re the best out there👍🏻

[@jcnotnot8120]

I'm gonna guess it's what he said about building up kinetic energy. Projectiles should hit the hardest at or near point blank then peter out in velocity the farther they travel. Don't know what he's on about "it has to be a minimum of x yards." Also, I haven't heard anyone used yards in years. edit: I was right, yes!

[@josephtillery4183]

I think what he means is the accuracy of the arrow. As the arrow travels around the bow when it is fired it flexes and kind of snakes through the air. The arrow curves back and forth in an oscillating motion and as it gets farther away from the point it was released it stabilizes due to the fletching and averages out the oscillation to a certain extent. When at 10 yards there isn't enough distance for the oscillation to reduce enough for the arrow to be accurate. It probably caught the deer on the extreme of an oscillation and deflected across the surface of the deers skin instead of penetrating it and downing the deer.

[@rileymccarrick8596]

@@josephtillery4183 I'm an archer, and though you're correct with the arrow flexing in the air, it doesn't really throw off the accuracy much. At 10 yards, you shouldn't have any problem hitting a precise target. What concerns me is that the guy couldn't get a clean shot at 10 yards. Dude needs to go back to the range!!

[@thenatmann1]

I freaking love you Dr. hanson, you definitely help me out so much and you are hilarious!!

[@hawkeye4205]

Hope you had a great break. Look forward to your Dynamics lessons, because my professor is...well something else.

[@sphanie]

not jeff dragging a random hunting show in between these dynamic lessons 💀💀💀

[@ahmadismail1319]

Dr. Hanson, you say once the bullet leaves the barrel there is no more acceleration. I understand you mean there is nothing to accelerate it in the direction it is headed (propulsion). But the correct answer is that the air friction causes a deceleration in the bullet (which is negative acceleration) which is why eventually the bullet will stop given it does not hit something or fall to the ground due to another acceleration acting on the projectile-earths gravity.

[@Shancyyy]

I guess the only way that would make sense is if they were shooting downhill and relying on gravity to accelerate the arrow.

[@freddurst2758]

Hell even then, the arrow is probably above its terminal velocity and would still slow down, albeit maybe a bit more slowly.

[@bArda26]

welcome back. I took dynamics long ago but glad to see you are continuing

[@Insohgram]

he picks a wrong positive side 🤣🤣🤣🤣🤣

[@chasegregory1328]

Love the video, keep up the great work!

[@erdemyazgan8502]

as human beign or as our brains love learning with the these lessons. Thanks a billion. It has been my honer for you

[@steveakers3322]

Rocket propelled arrows. Awesome. We wouldn't be allowed to have them here in Australia though.

[@NinjadoPantanoPlays]

Hey Dr. Hanson! I got a quick question; If you were to shoot a bow at a target that was somewhat far, you'd aim slightly upwards so the arrow travels in an arch. In this case, would it be possible that the arrow actually hits the target at a greater velocity/with more energy than the initial velocity? I think that's what he was referring to, the arrow falling down in an arch and building up velocity that way.

[@nicolaslajoierestrepo8176]

Without considering wind, the horizontal speed will be the same for all the trajectory because the acceleration (gravity) only acts vertically. Now the vertical speed would be the same going down than the speed going up (for the same height), that statement would only be true if the target was lower than you, say you shoot from a building. but it's not because of the parabola, you could shoot straight down and have the exact same result.

[@Malfunct1onM1ke]

Greetings from germany. enjoy every episode on this channel. Keep it up, Mr. Hanson :)

[@Freemangelatala]

Hanson is roasting buns

[@CluckYou21]

LOL. Rocket propelled arrows.

[@Axliun]

your back great

[@scrotumtotem7]

what about his back? Am i missing something here is Dr Hanson actually shredded ???

[@mustafacoskun6908]

Sir this lesson blocked in Turkey (idk why). I'm gonna crazy at the right now alksdakşsdlasd. If is there anyone have dream like wanna come and live in Turkey, pls don't!

[@soupinfinity8209]

You have been the reason why I stuck to being an electrical engineer. Irony isn't it?

[@gamesofcontent]

I remember watching that and I couldn't stop laughing.

[@ananya8186]

thank you!!! this was so fun to watch

[@deanecasey3022]

#stopthemadness - you're the best

[@hernandezwendellc.7145]

thanks for the lessons.. from philippines also

[@aga080]

ur the best.

[@isabellasmith8650]

well f he was in a tree stand that was 15ft in the air, the arrow would build up speed heading down right

[@shaneprather4535]

They must be hunting off of cliff sides.

[@cody4478]

Lmao this is great

[@belirsizintegral3682]

I failed static so I m going to watch dynamic next term

[@aidingolrokh9102]

Here is the scenario: We have a few layers of Styrofoam in front of a bow. We first shoot the bow from 1 millimeter distance between its arrow and the Styrofoam. Then we shoot it again this time from half a meter distance. Why do I get the feeling that the second time the arrow will penetrate more than the first time?!

[@steveakers3322]

The arrow is accelerating the whole time it is in contact with the string. The instant the arrow leaves the string the only force acting on the arrow in the horizontal direction is friction, which we commonly call wind resistance.

[@harishprabhakar5842]

Moreover, in the presence of gravity, you have and x and y component. Due to gravity, the tangential force will not be in the x component completely. So when the velocity is the same in the x component (ignoring air resistance), the tangential velocity is pointed more below the x-plane and therefore since it is not orthogonal to the Styrofoam anymore, it will not penetrate as much. (this means the normal force acting on the arrow will be lesser than when the arrow is closer) Without gravity, no matter what the distance is, they will penetrate the same :). Correct me if im wrong ont his part: but the tangential force is also at an angle downwards due to gravity

[@ryanlynch4528]

The only compound bow I shot wobbled like crazy off the string. It took about 30ish yards for it to stabilize. Perhaps hitting a target with an off kilter arrow would result in less penetration? Although the force imparted on the target would still be about the same I'd think.

[@TNBikers63]

Wow!

[@erdemyazgan8502]

yeah really you are different from the others

[@zero_kelvin_]

hahaha

[@ryanlevihead1419]

HA

[@Dean.Michael.Winchester]

thats why they end up making shows, instead of educating people..

[@NeverendingAbyss]

heh.