Introduction to the Coefficient of Friction

[@VoodooMansion]

Straight to the point is how I like to learn. Thanks.

[@FlippingPhysics]

+NightEye Thanks. In the 2.5 years I have been doing this, I have slowly learned to be more concise. Glad you recognize that.

[@Tunu_AI]

What are doing bro are u alive😂

[@psolo3]

I love your videos man!! you make learning a very difficult topic a little easier! thanks so much

[@FlippingPhysics]

That is my hope. Glad you think so.

[@jshao22]

Man, you have no Idea how helpful this has been to me. You are a fantastic teacher. I wish there were more of you to cover all the sciences and maths.

[@FlippingPhysics]

Four isn't enough?

[@jshao22]

Haha, nah man we need like 1 million of you and everyone will be educated.

[@FlippingPhysics]

+dipper3567 I'll see what I can do...

[@radio146]

OMG you are awesome!!! I love the discussion between "you and yourselves" haha. It really helps me learn!

[@ShoaibRashdi]

You really deserve more subscribers and views! keep up the hard work.

[@FlippingPhysics]

+Shoaib Rashdi Thanks! (Filming right now, actually.)

[@ShoaibRashdi]

+Flipping Physics that sounds great, it has been almost a month since the last one.

[@FlippingPhysics]

+Shoaib Rashdi Sadly yes. Between my daughter's pneumonia, my root canal surgery, construction on my street and the beginning of the school year, I just haven't had time to film any videos. However, I am back at it today!

[@Shuathefootballer]

That Billy kid pretty smart

[@Cocklord911]

I always thought bo was the hidden genius

[@pizzaboy2349]

this is unbelievably helpful

[@FlippingPhysics]

you are welcome

[@sarahabdellatif2433]

you are so great humorous and i like your way of teaching it is very fun my physics teacher at school fails to keep me awake for ten minutes

[@rahmanrahmani2896]

Very funny! who are the other comedians who were helping you. They look very much like you. Are they triplet !!! Thank you

[@elijahjflowers]

This is so profound. Especially 2:34.

[@pranavkulkarni2023]

Does friction come into action only when force is applied or even when it is at rest?

[@carultch]

Static friction applies as a force of constraint to prevent sliding, for two objects in contact that are initially at rest relative to each other at the point of contact. It can be less than mu_s*N, or up to mu_s*N. Kinetic friction applies when existing sliding motion is already present, and regardless of what else is happening, it will equal mu_k*N.

[@kallolo90]

mu depend on the surface contact between two materials. So it means that mu can be vary according to specific materials in contact. My question is, is it. possible we can measure the mu of the road high way? what is the spec or the mu used? because different tire has different mu level when in contacts, while the road should be the same

[@sivakumarsiva1743]

What do you exactly mean by coefficient if friction

[@MChedderbeef]

Keep up the awesome teaching!!

[@FlippingPhysics]

+M. Chedderbeef Thank you, I will.

[@haroldsardo3971]

how can i get the friction coefficient in a horizontal plane that's being influenced by vibrations?

[@adrianaselena14]

Could you explain what is meant by two bodies slip when the coefficient of static friction exceeds its maximum? When it says "slip" does it mean when the two bodies are starting to slide against each other, or does it mean when one body is about to reach the tipping point and falls off the other body?

[@FlippingPhysics]

I have a video which should answer your question. www.flippingphysics.com/friction-problem.html

[@bucklogos]

I would have assumed that glass on glass would have a very low coefficient of friction, why is it so high compared to other materials?

[@venkateshhms6925]

You guys are awesome people please make more content like this I love your videos

[@FlippingPhysics]

Thanks!!

[@brendaluis565]

Okay so what would happen if we were searching for the Force of Friction in collisions and we are not given the coefficient of friction (μ). For example, the problem I am working on looks like this: "A 1200-kilogram car moving at 12 meters per second collides with a 2300-kilogram car that is waiting at rest at a traffic light. After the collision, the cars lock together and slide. Eventually, the combined cars are brought to rest by a force of kinetic friction as the rubber tires slide across the dry, level asphalt road surface. Calculate the magnitude of the frictional force that brings the locked-together cars to rest." The equation for friction force is Ff= μFn. I was able to calculate the normal force but I cannot figure out how to get the coefficient of friction ( μ).

[@FlippingPhysics]

I am sorry, however, I do not solve homework problems for people. This looks remarkably like a homework problem.

[@brendaluis565]

It was a worksheet we were working on in class lol. I'm not necessarily asking for you to solve it, I was just asking for like a formula (if there is one) or the process to find the coefficient of friction without the force of friction.

[@FlippingPhysics]

Makes sense. In order to solve for the coefficient of kinetic friction you need to know the force normal and force of kinetic friction. Can't really solve for it without those.

[@brendaluis565]

Thank you 👍

[@FlippingPhysics]

The question basically looks like a combination of these two problems: 1st www.flippingphysics.com/perfectly-inelastic.html Then www.flippingphysics.com/tire-friction.html However, I feel like you are missing the distance (or time) the cars travel after collision.

[@mattthompson2385]

I like your videos a lot :)

[@lifeuu]

I learn more in this 5 mins then I did reading papers online

[@Mech.Masters]

What is the coefficient of Friction value for turcite on steel and turcite on turcite?

[@FlippingPhysics]

+Mech E No clue. Never heard of Turcite before, however, looking at its specs www.aetnaplastics.com/products/d/Turcite/ it looks like a fun material. If you have some of it, you could measure it like I do here: www.flippingphysics.com/tire-friction.html They list some coefficients of friction here: www.aetnaplastics.com/site_media/media/attachments/aetna_product_aetnaproduct/57/Turcite%20Properties.pdf

[@Mech.Masters]

+Flipping Physics Thanks a lot for such a quick reply. I do appreciate it. I tried searching on google, but i am not getting the value for static and dynamic friction.

[@Mech.Masters]

+Mech E Can i ask you some other doubts on which i am struggling from past?

[@FlippingPhysics]

+Mech E The ".pdf" from my previous comments lists "Coefficient of Friction, Dynamic (non-lubricated)" as 0.30 or 0.22 depending on which type of Turcite. However, it doesn't indicate the other interacting surface besides Turcite..

[@FlippingPhysics]

+Mech E You may always ask, perhaps I'll answer ... depends on my mood? :)

[@EgoTeach]

DAMN!!!! Your videos are so FUNNNNN!!! Thanks!

[@mohammadarifmayar9839]

I really appreciate the time and effort you give to the production of all of your videos. I wish you were my physics teacher. I have a question about the values of the coefficient of friction. My professor said that the value of coefficient of friction was between 0 and 1, 0 being frictionless and 1 being the highest value which is if two things are attached and not separtable. So is she correct? Thank you again for the videos.

[@FlippingPhysics]

I'll let you answer the question yourself. www.engineeringtoolbox.com/friction-coefficients-d_778.html www.carbidedepot.com/formulas-frictioncoefficient.htm www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm

[@sanmiguelprinzedarrenl.1349]

Is there a negative coefficient of friction?

[@FlippingPhysics]

No. That would mean either the force normal was negative (and towards the surface) or the force of friction causes the object to accelerate.

[@sanmiguelprinzedarrenl.1349]

@@FlippingPhysics thank you sir. This would help me in my homework

[@bhawnamehta2261]

Hi! This si my first time seeing your videos. And I'm asking myself why the hell didn't I click on that view button earlier?!? It would have saved me from all the hardships that I went through!! Have u made any video on Rolling friction?

[@FlippingPhysics]

If this is what you mean by rolling friction: www.flippingphysics.com/abs-brakes.html Yes. If not, then no, sorry.

[@bhawnamehta2261]

@@FlippingPhysics Thanks a lot!

[@MasterSkywalker.]

Thanks for helping

[@zubeyirozay2164]

GREAT VIDEO

[@jajinfla]

I LOV THIS VID

[@elijahjflowers]

Thank You!

[@maggie4430]

a little confused - you said the greatest value for the coefficient of friction was 4, but then you wrote down 2?

[@FlippingPhysics]

In extreme situations the static coefficient of friction can be up to 4. The example I give is racing tires. Under normal circumstances a max of 2 for coefficients of friction is reasonable.

[@anoopgunawardhena222]

thanks man real ly helpful

[@FlippingPhysics]

you are absolutely welcome.

[@ahmedaldakhoul5093]

it is really amazing.....thank you so much

[@FlippingPhysics]

+Ahmed Aldakhoul you are absolutely welcome.

[@MasterSkywalker.]

HE IS A JEDI!!! He Just Vanished away...

[@sinekonata]

"Therefore the coefficient of friction could never be less than zero" We all know some day some jackass is going to invent negative friction coefficients.

[@origamigek]

like all good teachers, he fades away after the lesson

[@FlippingPhysics]

Thanks?

[@vishalgupta895]

Again you are great

[@FlippingPhysics]

Again, I thank you for your kind words.

[@helenday5031]

Sometimes madness makes perfect sense! lol

[@dharunkumar8461]

Vere level da mapi

[@8bitking37]

holy shit im learning physics from a wook no offense man and actually thanks something i can understand but woah

[@FlippingPhysics]

Uh, hey king of eight bit technology, I do not think I fit the description of "wook" at all. And, given you seen to have actually watched at least one of my videos, you should probably agree.

[@Bravo_L]

saving my ass for online calc based physics 1 ._.

[@Justsmilelikeadonut]

Do you have any other job than youtube

[@FlippingPhysics]

I teach high school physics part time. If I were full time, I would not have enough time to make these videos.