Projectile Motion is NOT Parabolic (Stop Thinking That It Is, Please) 

Dayton, this was pretty interesting. As a man of physics, I've always known that the "parabola" idea was just an approximation, but, had no idea the reasoning behind it. This was very informative, and, I like the new video style. Also, don't back down - I have between 3-5 flat earthers that are subbed to my channel just to dislike every single video. They dont want discussion or education, they just want to be trolls. Just let their dislikes be drowned out by the thousands of likes that will follow. Cheers!

You forget air friction! : ) When the motion is small compared to earth curvature it gives an flattened parabola with the following equations of motion: x(t) = v0_x/b * (1 - exp(-b*t)) y(t) = 1/b * (g/b + v0_y) * (1 - exp(-b*t)) - g/b*t Where we accounted of a friction of the form F= -b*v When b → 0 it recovers the form of a parabola. When accounting with earth curvature and neglecting friction like it's expained in the video it can also be a parabola, if the initial speed is exactly v0 = 11,19 km/s

LOL, I'm pretty sure that some flat earthers subscribe to me just to dislike each video. Whatever floats your boat, guys...

Not a parabola? So I've been lying to people my whole life? Gravity, man... Always bringing me down.

Didn't get to study physics in high school but my biology teacher's name was Lincoln Jividen and yeah he had a bit of a drawl. Always enjoyed his classes. Love the videos Dayton, keep em coming!

I am en route with a boombox

nice topic mate, i really had no idea and enjoyed learing about it, good luck with you next video, and hey if your up for it can you please put a video about the inductance of the tranmission lines and how it is measured, cuz my teacher is kinda strugling with it xD

Isn't this why they say things orbiting the earth are actually just always falling, like the iss

Ah! I am happy that my thinking is right. You assured me. A lot of thanks. Love from Bangladesh.

FWIW: Barrier style pop shields are really for studio vocal performance. You'll probably find a foam shield far more convenient for spoken word. You can aim the mic up to the mouth too. Is that a measurement, omni pattern mic? I cant see what it is.

Great and simple way to explain it, i did a video about that in spanish, i was playing basketball then i thought what would happen if i throw the ball and in mid air the earth compreses into a single point and the basketball would orbit that point so is not a parabola like you said is an ellipse!, of course we are asumimg all the mass of the earth compress into a point, anyway great video

Thank you for content

Great video

If one throws a corn perfectly strate (straight) up one needn't worry about the change in direction of gravity vector, but would have to account for the acceleration varying as the corn goes up then down. Throne (thrown) at an angle, corn would follow an ellipse or parabola according to the density of gravitating body, thus: A small, very massive earth would bring about a more elliptic path, while a very large but light object would have relatively less curvature, and corn would experience less gravitational variance. So, as density approaches zero, corn path approaches that of a perfect parabola. But then, the earth would be flat, and corn would fly off into space. So, since it virtually always comes back down, Earth must not be flat.

Would that work with a coconut too?

Can you do a video on birkland currents and the electric universe theory do a comparison against newtonian physics or whichever gravity model you subscribe to I'll be very interested to see that. Great job on your video keep it going

never been a flat-earther, but i didn't know about the kepler ellipse. i guess i never asked myself enough questions in my kinematics classes and just stuck with parabolas all my life. thanks for the existential crisis dayton!

Ok all of that is very true, but I think the fact that physics teachers tell us to ignore air resistance causes bigger issues 😂, even without throwing an apple around the world.

Thank you.

brilliant xx

Flat earthers are just even better approximators. Instead of Ellipse -> Parabola, they make the jump from Ellipse -> Flat Line. Give them credit for their incredibly high IQ!

Will the Fermi lab Deep Underground Neutrino Experiment be the definitive round earth proof by the angle of the beam pointing into the ground to the far detector 800 miles away? Also don’t mock the southern accent, they get smarter every day;)

❤❤❤❤❤❤

Physics (and other sciences I expect) routinely simply the situation to limit the complexity of the mathematics required. Anyone who has taken a college physics class (an admittedly small number) knows the examples always talk about neglecting air resistance for falling objects, ignoring the curvature of the earth when discussing short range projectile motion, mass-less ropes and pullies, frictionless surfaces, etc. Pseudo-science advocates such as flat-earthers, of course, sometimes try to exploit that by proving the assumption false and claiming victory. There are a wide range of things observed on the surface of the earth which the flat-earthers cannot explain, including the Corbeaus Effect which explains ocean and atmospheric currents, artillery trajectories, airplane flight plans, etc. Then there are the tides which happen two times each day. Sunrise and sunset, the visibility of the North Star or the Southern Cross, map accuracy. Only by being ignorant of all these things or by providing a single model of a flat earth that can account for them all allows a person to claim to be both a flat-earther and a rational human being.

I thought flat earthers were really smart? They figure out stuff which eludes the greatest minds on the globe.

I’m always pleasantly surprised when your videos pop up in my subscription feed!

yay another video!

Flat earthers are a joke and are comedians who just like to make people laugh! Well, they certainly made me laugh! LMFAO!!

tell the truth, how many takes did it take before you got hit on the head with the apple?? coz it look like it hit that tree a few times, it was mashed. oh and thank you for pointing out this obvious one. i was told in school that when you through a stone ETC, it travels in an perfect ellipse.. or or parabolic. even got detention for pointing thats wrong. (the teacher through a piece of chalk which hit me in the face and said "tell how that traveled King ya smart aras little shight" & gave me detention.. & YES!! in Ireland back when i was in school a teacher(not all of them, but just a few, to be fare & honest) would kick the crap out of ya for interrupting a class.

Hi you are actually inaccurate because technically the trajectory of a body under the influence of a single gravitational field that can be modeled as a point mass assuming idealized conditions is a geodesic not a parabola nor an ellipse. However the math for geodesics are complicated therefore parabolas are used for shorter distances and ellipse for longer distances such as planetary orbits because as you astutely pointed out the eccentricity can be approximated to a parabola or ellipse for most circumstances because both are conic sections.

I laughed so hard at the "this here ear of corn " part. Hilarious. Thank you.

wow

dayton thank you for being our most reliable supplier of "ACKTCHUALLY" fodder

EXCELLENT WORK M'BOY! KEEP ON HUSKIN THAT THERE COOOOOOOOOOOOORN

So earth is flat? Lol just playing with you! Wow and I've had people say I sound country. It sucks how the stereotype kinds depicts people with a country accent as being unintelligent.

Hello! Back again, I seem to be the first commenter and viewer!

Bruh this vid too short I thought the outro was the intro

hello video-man take my Algorithm Coin and use it. to become Big youtuber

The earth can not be flat if it was the cats would have knocked every thing off by now!

Oh, looky me, I'm 4th to comment about nothing!