Do Anti-lock Brakes use Static or Kinetic Friction? by Billy

[@introvideo5064]

At first, I had a hard time getting along with the videos, but now I am addicted Mr.P ;)

[@benkcpps]

Great video! I'm impressed with the amount of effort put in to make them . Keep it up!

[@FlippingPhysics]

They do take quite a bit of work, however, I think they are worth it!

[@ryan-ik3rq]

these videos are amazing, your hard work will not go unnoticed I guarantee it. I believe with some time this channel will become very popular!!

[@FlippingPhysics]

Thank you. Hard work .... and lots of patience.

[@samanthrushi]

That's the proper explanation of ABS...GREAT

[@alexandrefolz]

Simple question: during static friction period, there is no movement of the tire relative to the ground(rolling without slipping definition), right ? If there is movement of the tire relative to the ground, then there is slipping (rolling with slipping) and we have kinetic friction, right? It is quite simple to understand how the kinetic friction produces resistant work that reduces kinetic energy, since we have both force and displacement of the tire relative to the ground. The question is: if there is no displacement of the tire during static friction periods, how is possible that the static friction make any work to reduce speed? Is possible that the static friction does not produce any resistant work and all the reducing speed work is done only by the kinetic frictions periods? In that case, why the ABS break is so good? Could be the reason because you keep control of the movement during rolling without slipping static friction periods while the alternate rolling with slipping kinetic friction periods allow decreasing speed? And if it is not that way, how is possible to produce work without displacement between the surfaces that are in contact?

[@ayan6065]

Wow, everday 0.1k members are adding to the party...

[@FlippingPhysics]

And every one of them is bringing mass.

[@ayan6065]

@@FlippingPhysics 😆

[@davidgruen7423]

However the reason why ABS was invented in the first place was not to slow the vehicle down quicker, but rather to give more control to the vehicle during panic stop, because it appears to me that kinetic friction and static friction on the same surface with the same normal force acting on it doesn’t differ much, if at all.

[@carultch]

Right. It's to keep the steering wheels in static friction, so that they are still effective at steering the vehicle. Otherwise, turning the front wheels on a car with locked up brakes wouldn't do anything, as they can skid sideways just as easily as they can skid forward.

[@andrewjustin256]

Mr. P, could you please elaborate on the contrast between sliding friction and kinetic friction? I believe they are both identical right?

[@Uncertaintycat]

Dear Billy, in this one, when he is showing the total tires and frames all at once, it gets pretty busy - maybe the large frames count in the center ought to be up in the corner? I was having trouble paying attention to everything all at once. Otherwise, it was really "cool!" ;)

[@FlippingPhysics]

I'll pass your suggestion on to Billy. Truth is, I sometimes do this as well. It can be difficult to know how much information on the screen at once is enough.

[@shubhamsharma-pr7ex]

But while rolling it is rolling friction which is less than kinetic friction. Please explain

[@FlippingPhysics]

Rolling friction is typically caused by the bearings inside the wheel which are designed to have a very low coefficient of friction.

[@rocks813]

You go, Billy! Nice explanation. (P.S. I saw on Mr. P's website that you, too, love Taylor Swift! High five to a fellow Swift fan

[@keywordmcat2256]

great illustration

[@FlippingPhysics]

Thanks. I'll pass the word on to Billy.

[@Madeleine-cy5tr]

Woah, did he update this to have the cards in 2020? that's awesome

[@Jason-ke4jf]

Ha, I'd say Billy got an "A" on that video project.

[@FlippingPhysics]

I'll let him know. I'm sure this will make his day!

[@Jason-ke4jf]

It certainly made mine. :)

[@Mahesh_Shenoy]

can you please tell me, what mic system do you use? A link to amazon product would be awesome :) Nice video

[@FlippingPhysics]

Certainly. I detail my microphone setup on my "Technology" webpage. www.flippingphysics.com/technology.html

[@shmkrar1153]

That's an awesome video

[@FlippingPhysics]

Thanks. I'll let Billy know you think so when I see him in class tomorrow.

[@oweznero]

Slipping physics

[@FlippingPhysics]

nice.

[@junyuanchiong9747]

thank you !

[@FlippingPhysics]

You are welcome!

[@user-et5hc7tv9y]

if u have an exam just make it simple and say Kinetic is for a moving car and the other is for car that is not moving.

[@zeroblade8315]

I thought anything in motion had kinetic friction?

[@FlippingPhysics]

Kinetic friction occurs when the two surfaces are sliding relative to one another. Static friction occurs when the two surfaces are _not_ sliding relative to one another. In the situation of a rolling tire, typically the surface of the tire is not sliding relative to the road.

[@zeroblade8315]

@@FlippingPhysics ok thx

[@metalloid6623]

First gimme my cookie billy

[@FlippingPhysics]

🍪

[@ptyptypty3]

just wait, one of these days Billy is going to flip out and start believing in the FLAT EARTH theory/Conspiracy......... Don't do it BILLY!!.. stay the course.. :) ..... (p.s. Lately I've been seeing STUFF on youtube for that flat earth crap.. and I just had to add that here.. ) Peace All ... Physics WORKS!!

[@FlippingPhysics]

What? The Earth isn't flat. sure looks flat to me.