My high school physics teacher told us a story about how he got a speeding ticket. Then he went into a hypothetical scenario where he would try the excuse that the bottom of the wheel was travel at 0mph. He finished it with the police officer knowing physics too and that the top of the wheel is moving double the speed and he should write a ticket for that speed. Then they would agree to split the difference on his ticket. 😆 That was back in 2001, and I still remember that story from time to time.
After starting this video and only a couple minutes in, I look at the comments and seen the word "high" which I was thinking the same thing! Of course we weren't talking the same... AND now Chuck just took a hit! 😂
Just like the tank or crane treads. They blow my mind! Because the top part is moving very fast while the bottom part not even moving relative to the floor. 🤯
Neil has once again made something that is taken for granted and is almost entirely overlooked as an extremely interesting nugget of scientific awesomeness. Thank you!!❤❤❤
On the flanges of train wheels (from Wikipedia): "The running surface of most is conical, serving as the primary means of keeping the train's motion aligned with the track..." The physics and maths behind train wheels is much more interesting than meets the eye! 😍
Yeah, the flanges are not ever used unless there is something weird going on and is just a last resort type thing. The conical nature of the wheels keeps it on the track through turns.
@@MrT------5743 Right, That wheel squeal you sometimes get are the flanges rubbing against the rails. not something you want to happen - lots of wear which leads to earlier replacement of both wheels and rails.
School is why people don't love math and other sciences. The idea that everybody learns the same way, or should even try to do so, is so very wrong and alienates wonderful minds from the potential to learn.
@@VoltisArt Nobody ever said that everybody learns the same way, that's a straw man argument. Everybody needs to learn the same information, especially in math and science. Right or wrong, no creative answers allowed. The wonderful minds need to pay attention.
For me the only think that stops me from having it as a job is bc i need very high grades to make project and explore that subject, same for chemistry, astrology, cosmology etc etc. At least i have star talk.
Chuck puffed a one-hitter on camera, this is why I watch these videos every day 😂💨 As an automotive engineer I already knew the answer, but I was waiting on chucks reaction to the physics behind it and, as always, his reaction was priceless 🤣 puff puff pass, Mr. Nice 👌
My college physics course when taking electronics, gave me an interesting insight into going around a corner, going up or down a hill, accelerating or braking on icy roads in a vehicle. With your point that the contact point has zero velocity, you could have quite the discussion about dynamic versus static coefficients of friction! Especially with regard to those people that 'gun it' to go up a hill, get stuck, and marvel at the long time Canadian winter driver that just drives on by right up the hill! 😁
What is not being said here is the "part of the car that is always going zero" is actually a point on the edge of the tire which is constantly changing. So try to find that part that is infinitely small and only going zero for an infinitely small period of time.
The part going zero is = the contact patch. Tires "grip" the road and basically pull against the surface to propel the vehicle forward. It's no different than walking. The bottom of your shoe = contact patch, and even if you're walking at 3 MPH, the foot in contact with the ground is always at 0 MPH. But the principle is the same -- your shoe "grips" the ground and pulls backward to propel your body forward. Meanwhile, your other foot is moving forward *_faster_* than your body so it can be placed ahead of your other foot. When you put a foot down, you move ahead of that foot because it's speed has become 0 MPH. Depending on the tire size, air pressure, etc, the contact patch can be a couple of square inches.
I have always noticed and wondered how tank tracks work. What Neil explained is more obvious if you observe how the tank tracks move : the section touching the ground does not move, but the upper side moves super fast. Pull out any UA-cam video and you will immediately understand exactly what he meant. It is much more clear to understand with tracks than looking at car wheels. Great job in answering my question since childhood, Neil!
And it is the same when you walk or run - the foot on the ground does not move, the other foot is moving twice as fast. Interesting fact we never pay attention to.
So amazing and profound. Something I never thought about in 4+ decades of driving, but once you started, I could see it all. Dr. Tyson, you are a national, nay, a World-Class treasure, having the oh-so-rare talent/skill/ability to take a Gordian Knot of math and physics and turn or distill it into something almost anyone can understand. Bravo, sir, bravo.
Strangely, I did learn this in an engineering class I took in 1978, and the object of study was a drag racer because the design was as minimal as possible. I was flabbergasted at the wheel speed thing! Over the years I sussed it out, but I was still unsure of something. I just realized this is a calculus thing, too, because of the change of vector throughout the wheel. Both absolute speed and the change of direction of the force on the wheel. In the back of the wheel from the outermost and farthest back point of the wheel down to the zero velocity part, the vector has a backwards velocity. In fact, both front and back of the wheel from the midline down, the vector has a backward component. From the midline to the top, the vector has a forward component. That is why the absolute speed (speed measured regardless of direction) has to travel at twice the speed as the midline, so the wheel can catch up and surpass the forward vector of the midline. 😮😮😮
I figured this out (actually, it hit me enexpectedly) fifty years ago while riding my bicycle: Looking down past the handlebars at the axle, you can see it is stationary w.r.t. your eyes and the rest of the bike, while the road is blurred in one direction and the top of the wheel is blurred in the opposite! I then got into a nasty situation trying to explain it to two engineering-student friends, who wouldn't accept this, even though I drew similar charts to yours. Never did think of the fascinating train angle, but there's another interesting phenomenon: if you superimpose the trace of a tack stuck in the tire over the sinusoidal velocity curve, you get a very different curve, which only boggles the mind further. PS: I married one of those friends, and she has no problem with your explanation, but never did accept mine unequivolently, though she has 2 engineering degrees more than I do!
I miss your studio. Been here since the beginning of Startalk. I miss in person format. Also, more Cosmic Queries Please!! Thanx, love you Neil and Chuck
Chuck started out as a 'layman' role to provide a bridge to the average viewer, but now he catches on to NDT's explainers so fast that he's almost a bit of a physicist himself XD
The realization that tires do not move in relation to the road is crucial to understand tire behavior and grip. Tires have such tremendous grip because they operate with static friction. For all intents and purposes, it has the same amount of grip while standing still than when it is moving (there are also other factors, but when simplified...). Dynamic friction is much lower, a sliding tire has one third less grip than rolling tire. Also, we don't only get friction, we also get some adhesion, specially when the tire compound is very soft. Adhesion is chemical bonding with the tire and the road, and that can't happen if the contact patch would be sliding, it has to be static: not moving in relation to the road. Next lessons: what is a slip angle? It is fascinating topic, you should go google that.. Once you understand that it is the rubber that is stretching that moves and turns the car... you get a huge "ahaa!" and things become much more intuitive to understand. Once the rubber can't stretch anymore against the grip available it will either break or we start sliding. You will also then understand that there is net force and if we want to turn we can't accelerate or decelerate at max, you can only stretch the rubber so much. Max turning happens when forward velocity does not change, and max acc/deceleration happens when we are not turning the wheel at all.
Great vid guys. And the wheels on the train that contact the rails are actually conical from the inside out so that the flanges on the inside of the wheel are not continuously used to keep the train on the tracks, ONLY IN A STRAIGHT LINE. Perhaps you both can do a short physics vid about conical wheels on an axle? Skipping and diffraction and line of sight radio waves is an interesting thing too. Regards, Jas. VK4FJGS Rockhampton Queensland Australia
Joke I’ve used 4 slow movers - “If you were moving any slower you would be moving backwards” is that scientifically correct? Idk maybe it’s true! (Mind blowing episode) you’re the best! Dang…
There are wireless speedometers for motorcycles that use magnets to calculate the speed you are going. Thanks for the content, love learning with you guys.
um, if a transmitter was attached to a specific part of the wheel, as it rotates with the wheel would it not it's speed change as the tire rotates? So some times it would be going faster and sometimes slower.
Great video. Glad you explained it though 🤣 What goes up, must come down. Spinning wheels got to go round. I am surprised though with some of UA-cams BS that they they did not block this video because of Chuck lighting up?
i love these! because so often when he first starts you are like, what? that doesnt make any sense, but by the time he gets done you are like, oh right, thats super obvious, how i not see that right away!
Does Lord Chuck really smoke??? Love the relationship between Dr Neil and Lord Chuck ❤ I watched this video 6 times. So much fun to learn from these guys!!!!
One idea for attaching that device to your wheel could be to put a stationary rod through the center of your axle (attached with a specially designed rod/electrical system), run that rod all the way outside of your wheel about 3" (not too noticeable but youll see why we need the space), that holds another rod pointed 90° down toward the bottom of the wheel, then attach a free rotating small 3" radius wheel adjusted by a small electrical motor to move up and down the above rod. This would be fitted with a sensor for measuring the speed of the 3" wheel, and should theoretically, unless there's something I'm not taking into account, measure the speed of the wheel at separate speeds per setting of the height of the wheel. The rest is just sending the data back to the cab of the car where you can adjust a microwave transmitter to emit whatever speed.
This is all assuming a flat hub cap and it wouldn't reach, realistically, all the way to the bottom on a normal car due to the deformation of the rubber in the tires, but experimentally, it's 100% plausible, buildable, and potentially marketable.
Bursting your bubble here... Cops only tag ur speed from the front as you come towards them. Radar works by reflecting a signal multiple times, and the vehicle speed is calculated as an average. No speed changes occur from the side. Pop! Edit: Then there is the problem with laser radar...
Fantastic. Of course the top of the wheel goes faster than the car. It has to hurry around so it can get in front of the contact patch with the ground so IT can then become part of the contact patch!
00:39 Water towers still your #1 video and is up to 10 million views. After watching this video I had to watch the water tower one just cause you mentioned it.
Thanks for the video Dr. but I like to think about it as just a turning effect about a pivot/fulcrum (aka moment). In this scenario, the part of the wheel (whether that of a train or car) in contact with the road/rail momentarily acts the pivot with the help of friction. At the same time the parts (including the top, center and for the case of a train, below) perpendicular to it, undergo turning (again, momentarily). Of course, for a given spin provided by the axle, the extremes of the wheel which will momentarily be part of the the straight line drawn through the pivot, will experience the maximum torque. The part acting as the pivot sacrifices its turning/movement for all other parts of the car/train to move🥲... happy Easter to you all.
PLEASE Do the engines one - I'm a gearhead who loves physics and engineering, even more since it stopped being my major, but I love hearing how others describe it even though I understand what's happening
Damn, and I thought learning about why toast takes so long to brown was interesting...they managed to top that with this one. Bring on the more daily things to blow our minds! 🎉 😊😊
Now that was a very moving episode. Thank you Dr. Tyson and Lord Nice.
I see what you did there!
That was rude
My high school physics teacher told us a story about how he got a speeding ticket. Then he went into a hypothetical scenario where he would try the excuse that the bottom of the wheel was travel at 0mph. He finished it with the police officer knowing physics too and that the top of the wheel is moving double the speed and he should write a ticket for that speed. Then they would agree to split the difference on his ticket. 😆 That was back in 2001, and I still remember that story from time to time.
I heard the same story told by a physics professor in college from a professor visiting from Mexico.
After starting this video and only a couple minutes in, I look at the comments and seen the word "high" which I was thinking the same thing!
Of course we weren't talking the same... AND now Chuck just took a hit! 😂
Neil and Chuck you guys are priceless
Understatement
Chuck lighting the one hitter is wild!!😂 I love y’all
Thanks for pointing that out wasn't sure what it was so assumed he took one hit off a cigarette😁🥳 left handed cigarette😅
Look at their eyes and how they are giggling like school girls.... They are both f××king lit!
It's funny AF!
I'm with Chuck on this one. Mind blown. Thanks
Just like the tank or crane treads. They blow my mind! Because the top part is moving very fast while the bottom part not even moving relative to the floor. 🤯
Neil has once again made something that is taken for granted and is almost entirely overlooked as an extremely interesting nugget of scientific awesomeness. Thank you!!❤❤❤
Agreed 👍🥳❤️🔥❤️🔥❤️🔥
On the flanges of train wheels (from Wikipedia): "The running surface of most is conical, serving as the primary means of keeping the train's motion aligned with the track..." The physics and maths behind train wheels is much more interesting than meets the eye! 😍
You beat me to it. Had the exact same thought when I heard neil talk about the flanges.
Yeah, the flanges are not ever used unless there is something weird going on and is just a last resort type thing. The conical nature of the wheels keeps it on the track through turns.
@@MrT------5743 Right, That wheel squeal you sometimes get are the flanges rubbing against the rails. not something you want to happen - lots of wear which leads to earlier replacement of both wheels and rails.
@StarTalk needs to do a video on this.
@@spirko97 Richard Feynmann did a video about this ua-cam.com/video/y7h4OtFDnYE/v-deo.html
seeing chuck learn how to think is awesome!
How people don't love physics, I will never know..
School is why people don't love math and other sciences. The idea that everybody learns the same way, or should even try to do so, is so very wrong and alienates wonderful minds from the potential to learn.
Neil is an extraordinarily gifted teacher. And so is Chuck.
@@VoltisArt Nobody ever said that everybody learns the same way, that's a straw man argument. Everybody needs to learn the same information, especially in math and science. Right or wrong, no creative answers allowed. The wonderful minds need to pay attention.
For me the only think that stops me from having it as a job is bc i need very high grades to make project and explore that subject, same for chemistry, astrology, cosmology etc etc. At least i have star talk.
We can do the math....
This one was hilarious...
😂😂😂😂
Thank you so much, for the fun and for the knowledge. Cheers!!
I believe people learn more easily when the brain is running on the pleasure circuitry.
"Excuse me sir, do you know how fast you were driving?"
"Yes, officer, at least one part of my vehicle was below the speed limit. Are we done here?"
That's FUNNY!!!!!!!! I want someone to experiment with this and let us know how it goes, hahahahahaha
I love this! I learned it in high school physics and share it anytime an opportunity arises. You two rock!!
You guys always bring a smile to my face
Chuck puffed a one-hitter on camera, this is why I watch these videos every day 😂💨
As an automotive engineer I already knew the answer, but I was waiting on chucks reaction to the physics behind it and, as always, his reaction was priceless 🤣 puff puff pass, Mr. Nice 👌
*flickers lighter*
In England, we call it a 'Secret Agent' lol
Anyone got a timestamp for the one hitter?
4:20
@@upupuptheziggurat.liketysplit I love that name omfg I'm stealing that.
"Ah excuse me gents, I need to go meet up with my secret agent."
Thank you for inviting us to share in your thoughts always a pleasure listening to your conversations. 😊
I Love you guys so much. Thank you for this show. Makes me so happy.
I love the way Chuck reacts to understanding what Neil is talking about 😊❤
Science never ceases to amaze me.
My college physics course when taking electronics, gave me an interesting insight into going around a corner, going up or down a hill, accelerating or braking on icy roads in a vehicle. With your point that the contact point has zero velocity, you could have quite the discussion about dynamic versus static coefficients of friction! Especially with regard to those people that 'gun it' to go up a hill, get stuck, and marvel at the long time Canadian winter driver that just drives on by right up the hill! 😁
What is not being said here is the "part of the car that is always going zero" is actually a point on the edge of the tire which is constantly changing. So try to find that part that is infinitely small and only going zero for an infinitely small period of time.
The part going zero is = the contact patch. Tires "grip" the road and basically pull against the surface to propel the vehicle forward. It's no different than walking. The bottom of your shoe = contact patch, and even if you're walking at 3 MPH, the foot in contact with the ground is always at 0 MPH. But the principle is the same -- your shoe "grips" the ground and pulls backward to propel your body forward. Meanwhile, your other foot is moving forward *_faster_* than your body so it can be placed ahead of your other foot. When you put a foot down, you move ahead of that foot because it's speed has become 0 MPH.
Depending on the tire size, air pressure, etc, the contact patch can be a couple of square inches.
Mind BLOWN.... once again! 🤓
This is what a good general education should be all about. Having fun and getting smarter at the same time.
I was really waiting for him to use tank tracks as a reference. They give the absolute best representation of what he's describing.
I have always noticed and wondered how tank tracks work. What Neil explained is more obvious if you observe how the tank tracks move : the section touching the ground does not move, but the upper side moves super fast. Pull out any UA-cam video and you will immediately understand exactly what he meant. It is much more clear to understand with tracks than looking at car wheels. Great job in answering my question since childhood, Neil!
And it is the same when you walk or run - the foot on the ground does not move, the other foot is moving twice as fast. Interesting fact we never pay attention to.
Great episode
Thanks, I have shared this Explainer to 7 or 8 people and watched it, maybe 20 times myself. It's one of your best ❤
Fantastic episode. ❤
brilliant ☀️
I always like how excited Chuck gets.
So amazing and profound. Something I never thought about in 4+ decades of driving, but once you started, I could see it all.
Dr. Tyson, you are a national, nay, a World-Class treasure, having the oh-so-rare talent/skill/ability to take a Gordian Knot of math and physics and turn or distill it into something almost anyone can understand.
Bravo, sir, bravo.
He needs to take this video down and make corrections. What he said about train Wheels is not correct
That was wheely interesting!
You guys are the best! 🎉🎉🎉
As a Canadian who only gets US tv ads when watching away streams of hockey games, CONGRATS on the Direct TV commercial!
Chuck lighting up put me in tears 😂😂😂
Strangely, I did learn this in an engineering class I took in 1978, and the object of study was a drag racer because the design was as minimal as possible.
I was flabbergasted at the wheel speed thing! Over the years I sussed it out, but I was still unsure of something.
I just realized this is a calculus thing, too, because of the change of vector throughout the wheel. Both absolute speed and the change of direction of the force on the wheel.
In the back of the wheel from the outermost and farthest back point of the wheel down to the zero velocity part, the vector has a backwards velocity. In fact, both front and back of the wheel from the midline down, the vector has a backward component. From the midline to the top, the vector has a forward component. That is why the absolute speed (speed measured regardless of direction) has to travel at twice the speed as the midline, so the wheel can catch up and surpass the forward vector of the midline.
😮😮😮
This was a wheelie interesting episode, thank you!
Officer: Do you know how fast you were going?
You: It depends on what part of the car you're talking about.
LOL this the one
9:27 I love when you talk about the rotary! I still daily Drive my 1988. A rotary has been my only car for the past 20 years. 😅 I think more 🚗
lol I never thought I'd see chuck hitting a joint on camera, HILARIOUS 😂
Love you guys please please please never stop ♥️
I'd just like to point out the cosmic coincidence of Chuck lighting up at EXACTLY 4:20.
Whoah! I was just asking for the timestamp of him lighting up. What a coincidence! Or is it?
I figured this out (actually, it hit me enexpectedly) fifty years ago while riding my bicycle: Looking down past the handlebars at the axle, you can see it is stationary w.r.t. your eyes and the rest of the bike, while the road is blurred in one direction and the top of the wheel is blurred in the opposite! I then got into a nasty situation trying to explain it to two engineering-student friends, who wouldn't accept this, even though I drew similar charts to yours. Never did think of the fascinating train angle, but there's another interesting phenomenon: if you superimpose the trace of a tack stuck in the tire over the sinusoidal velocity curve, you get a very different curve, which only boggles the mind further. PS: I married one of those friends, and she has no problem with your explanation, but never did accept mine unequivolently, though she has 2 engineering degrees more than I do!
You made my day! Thank you very much.
Good one
I miss your studio. Been here since the beginning of Startalk. I miss in person format. Also, more Cosmic Queries Please!! Thanx, love you Neil and Chuck
4:20 I frigging died laughing.
Neil you owe me a new side, I broke mine laughing so hard
The fact that this happened at 4:20 🧐😂
Perfect timing 😂
@@reportedstolen3603 420 blaze up haha
I died laughing too Lmaooooooooo XD
I also took a hit with chuck afterwards, i was like him "LETS GO!" lolz
The editors knew what they were doing!
@@FutureMan420Blazer they thought they were subtle but to those of us with 420 in their name we know the truth, the editors are blazing up haha
Chuck started out as a 'layman' role to provide a bridge to the average viewer, but now he catches on to NDT's explainers so fast that he's almost a bit of a physicist himself XD
Yes, I agree. He’s also the straight man.
Chuck rly smoking the one hitter at 4:20 lmaoo
I’m a simple french, I see TGV, I like :-) interesting video btw
Great episode! Thank you! Heading straight to the water tower!
Wow enlightened!
I could listen to Dr. Tyson all day, every day.
The realization that tires do not move in relation to the road is crucial to understand tire behavior and grip. Tires have such tremendous grip because they operate with static friction. For all intents and purposes, it has the same amount of grip while standing still than when it is moving (there are also other factors, but when simplified...). Dynamic friction is much lower, a sliding tire has one third less grip than rolling tire. Also, we don't only get friction, we also get some adhesion, specially when the tire compound is very soft. Adhesion is chemical bonding with the tire and the road, and that can't happen if the contact patch would be sliding, it has to be static: not moving in relation to the road.
Next lessons: what is a slip angle? It is fascinating topic, you should go google that.. Once you understand that it is the rubber that is stretching that moves and turns the car... you get a huge "ahaa!" and things become much more intuitive to understand. Once the rubber can't stretch anymore against the grip available it will either break or we start sliding. You will also then understand that there is net force and if we want to turn we can't accelerate or decelerate at max, you can only stretch the rubber so much. Max turning happens when forward velocity does not change, and max acc/deceleration happens when we are not turning the wheel at all.
Hilarious back and forth!
I love you guys. Chuck's got some of the best reactions
These guys have insanely delicate senses of humor like no one I know. Times a million.
Great job again gentlemen
Thanks for the video!!!
shows how honest neil is that he doesnt even know the view count of his most viewed video 😅
Or maybe how arrogant he is
@@benjaminoakehow?????
To be a space dude, he's remarkably down to earth...
@@irenaveksler1935 I don't see it either
bcause...
no one cares
❤️ #IT #NEIL you both continue to serve my understanding 🤲🏾
Great vid guys.
And the wheels on the train that contact the rails are actually conical from the inside out so that the flanges on the inside of the wheel are not continuously used to keep the train on the tracks, ONLY IN A STRAIGHT LINE.
Perhaps you both can do a short physics vid about conical wheels on an axle?
Skipping and diffraction and line of sight radio waves is an interesting thing too.
Regards, Jas.
VK4FJGS
Rockhampton Queensland Australia
How could ANYONE
Not Love these guys ❔️ seriously
Mind blown 🤯
The water tower video was my 1st class in this UA-cam university class.
Had this in physics in high school wooooyeaaaahhhh quality education!
Joke I’ve used 4 slow movers - “If you were moving any slower you would be moving backwards” is that scientifically correct? Idk maybe it’s true! (Mind blowing episode) you’re the best! Dang…
I look forward to the extra explainer!
Nice🎉🎉🎉
Very Fascinating, but this way above my paygrade🤯
Very interesting indeed.
There are wireless speedometers for motorcycles that use magnets to calculate the speed you are going. Thanks for the content, love learning with you guys.
um, if a transmitter was attached to a specific part of the wheel, as it rotates with the wheel would it not it's speed change as the tire rotates? So some times it would be going faster and sometimes slower.
We love neil and chuck ❤️
This should get 2 million views
I always thought about this when I'm driving bycycle but never reached the conclusion. Finally got the answer and it was mind-blowing
This is going over my head lmao. Gonna need to watch it a couple of times
Great video. Glad you explained it though 🤣 What goes up, must come down. Spinning wheels got to go round. I am surprised though with some of UA-cams BS that they they did not block this video because of Chuck lighting up?
Idk how UA-cam allows videos being played while the phone is locked on iPhones but startalk should be one of those channels that allows it
i love these! because so often when he first starts you are like, what? that doesnt make any sense, but by the time he gets done you are like, oh right, thats super obvious, how i not see that right away!
Science made fun. Love it!
this is cool
Amazing
So if the vehicle is travelling at 75% the speed of light, what speed is the top of the wheel travelling at?
MY MAN CHUCK JUST PULLED OUT A STOGIE😂😂😂 Favorite podcast.
Interesting 😆😆
Does Lord Chuck really smoke??? Love the relationship between Dr Neil and Lord Chuck ❤ I watched this video 6 times. So much fun to learn from these guys!!!!
One idea for attaching that device to your wheel could be to put a stationary rod through the center of your axle (attached with a specially designed rod/electrical system), run that rod all the way outside of your wheel about 3" (not too noticeable but youll see why we need the space), that holds another rod pointed 90° down toward the bottom of the wheel, then attach a free rotating small 3" radius wheel adjusted by a small electrical motor to move up and down the above rod. This would be fitted with a sensor for measuring the speed of the 3" wheel, and should theoretically, unless there's something I'm not taking into account, measure the speed of the wheel at separate speeds per setting of the height of the wheel. The rest is just sending the data back to the cab of the car where you can adjust a microwave transmitter to emit whatever speed.
This is all assuming a flat hub cap and it wouldn't reach, realistically, all the way to the bottom on a normal car due to the deformation of the rubber in the tires, but experimentally, it's 100% plausible, buildable, and potentially marketable.
Bursting your bubble here...
Cops only tag ur speed from the front as you come towards them.
Radar works by reflecting a signal multiple times, and the vehicle speed is calculated as an average.
No speed changes occur from the side. Pop!
Edit: Then there is the problem with laser radar...
Fantastic. Of course the top of the wheel goes faster than the car. It has to hurry around so it can get in front of the contact patch with the ground so IT can then become part of the contact patch!
00:39 Water towers still your #1 video and is up to 10 million views. After watching this video I had to watch the water tower one just cause you mentioned it.
I can't wait to hear this.
Thanks for the video Dr. but I like to think about it as just a turning effect about a pivot/fulcrum (aka moment).
In this scenario, the part of the wheel (whether that of a train or car) in contact with the road/rail momentarily acts the pivot with the help of friction. At the same time the parts (including the top, center and for the case of a train, below) perpendicular to it, undergo turning (again, momentarily).
Of course, for a given spin provided by the axle, the extremes of the wheel which will momentarily be part of the the straight line drawn through the pivot, will experience the maximum torque. The part acting as the pivot sacrifices its turning/movement for all other parts of the car/train to move🥲... happy Easter to you all.
Thank you
PLEASE Do the engines one - I'm a gearhead who loves physics and engineering, even more since it stopped being my major, but I love hearing how others describe it even though I understand what's happening
That is sick! 😅
Damn, and I thought learning about why toast takes so long to brown was interesting...they managed to top that with this one. Bring on the more daily things to blow our minds! 🎉 😊😊
Now somebody gonna invent this thing. Ty Tyson!
Same thing happens when we walk..the bottom of our foot touching the ground is not moving and the other foot is moving ahead faster than us !!
The fact that Neil has his 7th grade woodshop project somewhere around his house is also mind blowing.
I love you guys❤😂❤🎉❤