Theres actually a mathematical curve for optimizing gravitational paths. Its called a Brachistochrone curve!

@commandohazelnuts

7 ай бұрын

OP didn't watch his Vsauce!

@sleepingwarrior4618

7 ай бұрын

there is no such thing as Gravitational Paths. In current physics, the closest thing you can reference would be a geodesic path and isn't applicable to this demo. Sorry about that.

@smoshfan439

7 ай бұрын

When it comes to hypersonic glide vehicles this is called a boost glide tragectory

@averitiamiku

7 ай бұрын

​@@sleepingwarrior4618 yes there is, you have the high part lower than the beginning

@Holdens_australian

7 ай бұрын

⁠​⁠​⁠@@sleepingwarrior4618yes there is you have the high part lower than the beginning

Gravity... A heavy subject

@That-KidDo

7 ай бұрын

One of the worst things I’ve ever read. 7/10, has a little something for everyone

@stanleybochenek1862

7 ай бұрын

i hate gravity! -Carl Johnson

@lairdcummings9092

7 ай бұрын

@@stanleybochenek1862 that's ok. Gravity hates you back.

@michaelkarnerfors9545

7 ай бұрын

Great Scott, I think you are on to something!

@stanleybochenek1862

7 ай бұрын

@@lairdcummings9092 Ahhhh -Carl Johnson

Half through I realized how impressive this is that a video game can accurately simulate real world problems Love this game I got myself 2000+ hours

@Peter_Cetera

6 ай бұрын

What game is it?

@jaynobles.215

6 ай бұрын

@@Peter_Cetera beamng drive

@pancake5830

6 ай бұрын

same lol, been playing since october 2016 and have 2003 hours

The reason why the anchors didn't fall at the same time is because pendula only oscillate harmonically for small amplitudes. A rigid connecting rod should help, but when the difference in drop angle is that large, you'll always see a difference in the impact time.

@jojos38

7 ай бұрын

Also worth mentioning that BeamNG does have wind simulation so the anchor that goes the fastest will be more slowed down by the wind

@Holdens_australian

7 ай бұрын

bro you could've just said it's because that the chains are wiggling more the higher up they are therefore slowing them down

@isodoublet

7 ай бұрын

​@@Holdens_australian No, I couldn't, because that's not what's happening.

@Holdens_australian

7 ай бұрын

@@isodoublet yes it is

@isodoublet

7 ай бұрын

@@Holdens_australian No, in fact they wiggle less the higher up you go. What you described is not only not the explanation for what's happening, it doesn't even happen _at all._

That moment when you realize Car Pal has never been a Boy Scout. One Pinewood Derby race would have told you all of this. XD There's a reason the pinewood derby cars have a 5-ounce weight limit. The heavier the car, the faster it goes.

@car_pal

7 ай бұрын

Yes but I thought the skinnier tires were going to make up for the weight, I need to do more Pinewood races hahaha

@Scorpious187

7 ай бұрын

@@car_pal Next video idea: wooden cars on bicycle wheels

@lairdcummings9092

7 ай бұрын

@@Scorpious187 or cars made of girders, on concrete wheels.

@OFFICIAL_Driftlion

7 ай бұрын

​@@car_pal I have a challenge for you if your up for it tomorrow at 5:30 British standard time

@DUKE_of_RAMBLE

7 ай бұрын

​​@@car_palThere's such a minuscule weight difference there, that I don't think it should've increased its lead as much as it did... I _think,_ albeit far from a scientist I am, that the rolling resistance _(tire:road friction)_ of the tires on the road surface, plus the width of the tires generating more wind resistance, all should have culminated in the bike tire car winning. So either: - I'm correct, and BeamNG just doesn't calculate everything, causing for the results we got... - Or, I'm *incorrect,* where the wind and rolling resistance is NOT enough, and the extra ~250lbs _does indeed_ allow it to generate more speed. Someone get ahold of Matt Parker (Numberphile) and have him crunch the numbers! 😅 *_EDIT:_*_ Oh yea, another way to help in this test would be to weigh the cars. Then, add the difference back into the bike tire car, to remove that as a factor. That would at least help by telling us that either the friction and/or wind resistance _*_is_*_ getting calculated for._

That Gran Turismo start sound is NOSTALGIC af😌😌

@AviationLoverIndonesia

7 ай бұрын

POV: I play Gran Turismo Sport on my PS4 and I can barely recognize this start sound lol 😂🙂

Awesome video! But I was looking forward to seeing a comparison between the straight line descent and a full Brachistochrone curve!

I think the problem with the hockey pucks is that the car being able to move off the puck creates a partly inelastic collision so the momentum doesn't all transfer.

One thing you should try is seeing what effect changing gravity has on a pendulum. It's really cool.

@luisguilherme2403

7 ай бұрын

That's literally just watching a pendulum swing but sped up footage lol

This is a great example of potential and kinetic energy! Love the videos!

Computer scientist here, again! It's math time! You've stumbled upon a lovely problem from the calculus of variations, specifically finding the quickest path between two points only using gravity. The solution is called the brachistochrone curve. It shows that there's indeed a quickest path, and that path is unique.

Why doesn't anyone take color into account? Red is faster. Sometimes

@Slokman0

22 күн бұрын

Racism.

@collinkaufman2316

20 күн бұрын

​@@Slokman0no it isn't

TFW CarPal discovers the brachistochrone 😅

These are very educational, thank you carpal.

Technically the dipping slope was at a steeper angle overall until the end. If each dip returned to the same height as the straight slope the result would have been different.

Brilliant! Great job, as always!

This is one of those videos of yours that could go viral. It just has that energy!

i could watch this kind of videos non-stop forever!

4:41 In reality: The weight DISTRIBUTION of the wheels is very important. When you roll down a rod and a tube of similar weight and diameter down an inclined surface, the rod is faster, because the Mass is more in the center and has to be less accelerated to gain the same speed in the surface. But here we have also to take into account the mass of the Cars and the rolling and air resistance.

@krabstickle

6 ай бұрын

wouldn't traction be larger as well due to larger tyres? since it would also get more grip onto the pavement itself

@devinaschenbrenner2683

3 ай бұрын

​@krabstickle this is what I was thinking. More surface area, more grip, and possible stability.

The fastest way from point A to B using gravity as the only way to move something (in a case cars) is called a brachistochrone I think. Adam savage built one with Micheal from Vsauce

I haven't even watched this yet but I know it's gonna be great. Added to the bedtime queue!

I can hear the flat earthers now... 'BuT MuH DEnSiTy!!! GrrAvITy iS FaKe!'

Potential energy is a helluva drug.

Beautiful gran tourismo sound

Carol of the Autobellos😂

awesome video mate! really enjoyed it

Thank you Car Pal for informative vido

So.. A good turbo and a deep hill to launch!! Lmao Thx's 🤣

This is why old wood coasters use bunny hops. Doesn't feel like it's doing much other than feeling some g's, but you're actually gaining speed.

Its a good day when Car Pal uploads

With the wide and narrow tires, I think it has to do with the pressure the tires are experiencing The higher pressure (narrow tires) are going through higher friction than the ones with lower pressure (wider tires)

@kybern

7 ай бұрын

Shouldn't be the opposite? Lower pressure means greater surface of contact

@Rainok

7 ай бұрын

@@kybern i'm not sure, that's just my best guess, I'm not a physics major

@eeeehuu2130

7 ай бұрын

@@kybernthe pressure is not important, but very narrow tires need more energy to bend in order to have the flat surface that touches the street, as the angle is way bigger that they have to bend around. But at a certain tyre size the surface of friction gets so big, that again wider tyres have more friction. That effect only works on bycicles as they have small tyres. But since this is only a simulator they could still have this effect, because of some inaccuracies. This is nothing I made up and way to complicate to explain this fast. Just google: why are wider bycicle tyres faster.

@bobjames1521

7 ай бұрын

But since wheels roll the friction experienced by the contact patch does not affect the end result. The friction that has an effect is the friction in the wheel bearing which should be identical. I'd imagine it's down to the thin wheels being less resistant to adjacent forces that warp the camber settings. In this case there would be greater friction in the wheel bearing. Potentially, also the tyres being less resistant to "squishing" therefore flattening the rolling edge into a square which is less willing to rotate. The problem is that we'll need to know how deep BeamNG simulates these elements before we can know which ones are causing the observed effects.

@thomasmarshmusic8568

7 ай бұрын

It's the moment of inertia. The tyres had a more even distribution of mass VS the rims, which had more mass distributed around the edge. This means the moment of inertia of the rims is greater, as it takes more potential energy to rotate more mass around the same radius when compared to the tyres. Hope I explained this well enough.

Thank you mate! It was soooo relaxing!!

Nice demonstration of RPM TORQUE flywheel, relaxing music.

The reason that the wider wheels wound up going faster is because there was more mass at the rim of the wheel. If you think of the wheel as a lever, then you can see why. Force is mass times acceleration. There was more force on the wider wheels. It's a similar thing to having two wheels that are the same mass, but one has more mass at the rim and the other has more mass at the hub. The wheel with more mass at the rim is going to roll down a slope faster than the wheel with more mass at the rim.

@anteshell

7 ай бұрын

How so? When the mass is concentrated in the middle, the wheel would have less inertial resistance or less moment of inertia, which means it is easier to get rolling.

@thedabblingwarlock

7 ай бұрын

@@anteshell That's probably why the car with skinny wheels went faster at first. I don't think I did a good job explaining it the first time around, so here goes. Take two wheels that are identical in every way except that one has most of its mass at the hub and the other has most of its mass at the rim. If you roll them down a slope, the wheel with most of the mass at the rim will reach the end of the slope first. This is because the wheel with most of its mass at the rim is able to accelerate more. There's a greater force acting on it than on the wheel with most of its mass at the center. You can look at it like the wheel is a lever, but another way to look at it is that the wheel with most of its mass at its rim has more potential energy which means that it will have more kinetic energy. Potential energy due to gravity is dependent on distance from the ground. If we take the ideal versions of these wheels, ones where the mass is all at the hub or all at the rim while keeping them the same in every other way, you can probably see what I'm getting at. The potential energy for the mass in the wheel where it's all at the rim is greater than that of the wheel where the mass is all at the hub by the diameter of the wheel. Potential energy due to gravity is mass times height times acceleration due to gravity. Kinetic energy is mass times velocity squared. Unless we're talking a very short slope, inertia isn't going to affect the outcome much.

@punpundit5590

6 ай бұрын

​@@thedabblingwarlockThis is not correct. The wheel with all its mass at the rim has half its mass below the point where the wheel with all its mass at the hub has it, making their potential energy equal (you can tell, because they both have the same center of mass). This is about rolling resistance and rubber deformation, not potential energy differences.

lol the Gran Turismo sound xD

Great video

Don’t gravitate to your couch too much, or else you become a singularity 😂

5:28 reel pov of a very normal car trip

Watched this in physics class, taught more than our teacher did in the whole year

The fact that you taught me more than of my teachers in high school

Car Pal is a mad genius.

I love how these experiments represent real life physics concepts

Those cars on the centrifuge got yeeted into another dimension.

Saw this experiment (but with marbles), in the channel "Manual do Mundo", and it's really interesting to see the fastest way possible

Under gravity the wider tires may be better, but under engine power the wider tires accelerate better, and skinny tires have a higher top speed. It's basically inverted what the gravity test shows.

I found that first one very interesting. Basic geometry states that a straight line is the shortest distance between two points, but it appears to not be the fastest in your example here. I wonder if it has anything to do with the fact that most geometry only deals with two dimensions, rather than three dimensions where height can be taken into account. I definitely was not expecting it to be this intriguing, considering how insane your videos usually are!!

@ChrisJaquez

7 ай бұрын

It's actually a fun physics fact that the fastest descent is not given by a straight line, but by a surprising curve called a "Brachistochrone Curve". Look it up!

@ionic7777

7 ай бұрын

@@ChrisJaquezi second this, vsauce made a pretty neat video going over the whole concept!

@ldogg_48gaming

7 ай бұрын

@@ChrisJaquez I will look up that curve!! I have always found physics and cars intriguing!! This reminds me of what I used to do with my Hot Wheels when I made a track!!

@JayMaverick

7 ай бұрын

Just out of curiosity, if geometry deals with two dimensions, what exactly is the other dimension if not height? 😂

@realhughmann

7 ай бұрын

The red one weigh more that's why it went faster

This is just like racing, stepping one the gas early out of a corner gives up a big advantage, the early dip accelerates the car earlier and hence gives it an advantage over the entire course.

4:40 the reason white is faster is because there is more traction due to wider tyres, not because of weight. because the car has more traction it is able to grip onto the road better, allowing it to get more speed

It is actually really straight forward. You can calculate what should happen with conservation of energy, E = mgh and E=1/2mv^2. Ideally the cars arrive at the end with the same speed but the greater drop in height causes the red one to travel at a higher average speed.

THANKS FOR USING INTERSECTION CONTROLLER MUSIC YOUR A W

for the narrow wheel test you should take off some of the weight from the wide tyred car equal to that of the narrow one and then you will see definitive results on if rolling resistance is significant in beamng

It is about acceleration. If you accelerate fast, then you reach a high speed earlier and thus drive longer a high speed, which results in a higher average speed than constant acceleration.

Yet the white car goes FAR further after the roads end, the speed only works initially, kind of like speeding just to hit traffic.

Car Pal should be my physics teacher

Mind blowing also, I didn't know it's faster than straight road

4:40 there is another reason ,the intertia of the wheel (the spinning motion) forces the wheels to spin faster and that intern creates a loop of more speed until the integrity of the tires themselfs colaps and the high speeds rip it apart👍

The lower path is just faster. If train stations would have a long DEEP cruise section in between them, trains would get close to the end station really fast, without motors. Then roll up the ramp up partially to original height. All you need to do it lift the trains a bit up a steep bit for the next bit after some passengers got off.

3:00 the reason why its slower is the big black tires (or anything) work as shoch absorber.

When you raced the BMW-s downhill, I think the blue was slower, because of two reasons: 1. Tyre deformation is a bigger factor at higher speeds. 2.The more massive tyres handle that better and the narrow tyres also have some small sideways oscillating movement, that is not noticeable because it is frequent and the amplitude is small. However this definitely affects speed.

~ 4:34 wider wheels have drastically lower rolling resistance here as they are multiple times wider and thus have multiple times more area on which to exert the weight of the car on the rubber, leading to less depression OF the rubber and thus there is less movement of the rubber as the tire rolls, meaning less resistance. I'm trying to explain best I can remember.

Some nice cars and mods there, do you get them all from the same source, or various ??

wait, there's a working dyno in beam? and a weigh station? noice!

It's the problems of the Brachistochrone curve.

The top one is far faster. The reason is ALMOST everyone on the rode slows down for any change, up hill, downhill, minor bend in the road. The solution to driving faster is to teach people to drive better.

@Ghostface72200

3 ай бұрын

Rules in gravity are different from the ones given by a traffic light ma'am or sir

Quick physics lesson here for the initial tests: the steeper the angle, assuming the vehicle is in control, the greater the acceleration and therefore the greater velocity it will have.

You may inadvertently have designed an ingenius two-man sled concept, while creating those first two black and yellow ramps. No only do you get reduced surface contact, meaning higher speeds, you also have to seats built into the idea, with the two bumps.

A brachistochrone curve is the optimal curve (the curve created by tracing a point on a circle as it rolls - cycloid).

Acceleration due momentum - Nice Sinus Curve

1:10 "Ive won, but at what cost?"

No cars were wrecked in the making of this video.

Yeah Science!

By starting the cars on different slopes you are not starting them with the same potential energy. This is because the center or gravity will be at a different height. To make it fair, make the track the same at the start then change after that.

Oh, this takes me back to middle school. In science class, we were doing an experiment where we would roll marbles down different slopes. This being an American middle school, they decided to make it a contest to see who understood the concept the best. Being autistic, I was paired with this other kid who was a total douche who would always bully me. They always would pair me with this kid despite how awful he was to me because we were both special needs. Anyways, he went with the straight slope thinking he was going to win. I decided to use the brachistochrone curve slope because I knew that if it had a steeper slope than a straight slope, it would build speed faster, but also knew that if it was too steep it would lose all that extra momentum by the end. Also, this was before the Vsauce video.

5:27 this camera angle cracked me up

3:55 when they forget to add the 'baby on board' sign

@3:37 no the anchors should not hit the cars at the same time. Doesn't have to do anything with the chains. The path should be a Brachistochrone in order for them to arrive at the same time but the path of these anchors is just circular.

Experiment with anchors: potential energy of pendulum: Period = 2 * pi * sqrt(length/gravitational_acceleration). Value of gravitational accel. is 9.80665 m/(s^2)

4:53 i think that the wider wheels won because the bicycle ones were almost flat that weigh so the was more resistance

Not an expert in this field but, contact patch size influences the slippage of the wheel and the rolling resistance. More weight = larger contact patch, which affects N/mm2. Probably there’s some optimum more weight with larger patch, but where the rolling resistance is low enough while force need to spin (slip) the wheel. If I am correct, the rolling resistance is just a coefficient x normal force (weight of the car/4/area of the contact patch of the tire)

@Erowens98

6 ай бұрын

My understanding is that contact patch isn't really all that relevant when it comes to friction (within the reasonable bounds). The advantage of a larger contact patch is canceled out by the disadvantage of the normal force being spread over a larger area. This leads to Amontons second law "the force of friction is independent of the apparent area of contact." Of course this is assuming ideal circumstances. If you think of the friction or the tire with the road as more of a sprocket and track system. Then there is a point where the width of each 'tooth' is so small that any significant force can shear them. Mind you, in still a freshman of mechanical engineering so far from an expert. Edit: also worth noting. Contact patch does definitely effect wear and heat generation. Both of which will effect the friction coefficient of a tyre. Which is why race cars have massive tyres even though smaller tyres would theoretically provide equal friction.

The slingshot maneuver.

How do you get those real life car mods? I’ve been trying to figure that out for a while now

Can I ask which software do you use to make those simulations?

@joebond2099

6 ай бұрын

Beam ng drive

I think in the real world the narrower tyres will acc faster on the downhill section, but once they hit the flat section the momentum of the heavier tyres will make the other car roll further.

Im quick curious as to way the puck at the bottom was the same as the one at the top and not faster?

i have a question! How do you make these videos where two cars are going at the same time?

I wonder if more friction would change the outcome (rolling resistance). Perhaps at some point the longer distance traveled would make the car slower.

Drag, rolling resistance (from tires), they look like they arent modelled

thumbs up for the Grant Turismo 1 countdown sfx

Can you make it where the curved path down starts in the "middle" of the wave? like going above and below the straight line, not just bellow?

Just a nitpick here: the oscillated path is lower than the straight path, you should have made the straight path on the mediums of the oscillated path.

interesting experiment

It was an interesting video👌👌

There is no reason why two identical anchors (attached to identical chains or rigid rods, doesn't matter) dropped from two different angles should hit cars placed at the bottom at the same time. When you make one angle 5 degrees and the other 90 degrees, the 90-degree anchor gets insane acceleration at the beginning because the initial movement is "straight" down but STILL hits the car later than the 5-degree anchor (that starts moving in a nearly horizontal direction) - IRL, in simulation, and in theory. A circle is NOT a tautochrone/isochrone curve.

The wider tires won the race because the more surface of the wheel touching the road increases the max speed. It won't matter until you get to high speeds. Otherwise, wider tires are good for turning but that wasn't being tested.

9/10 Mind Blowing ( 3:34 I Know that Axes physics -1)

Ding! Fries are done!

More gravity is more grip 😂

YOU NEED A BRACHISTOCHRONE CURVE!

As I found out from playing racing games, having a car with high acceleration is far more beneficial on most tracks, than having a car with much higher max speed and horsepower, but also much higher weight. On any course with lots of long stretches of straight track, the higher horsepower/max speed would always win though.

Technically, the driver on the wavy road would end up being slower once a speed limit sign is installed