Introductory Static Friction on an Incline Problem

[@stephanburnett4942]

hey, this really helped with my physics lab thanks, your way of explaining things are very cool!!

[@FlippingPhysics]

You are welcome!

[@derp3044]

ur wolf is very cool!

[@richardfeynman4315]

I have been teaching physics on the high school and college levels for 38 years. You're good!

[@FlippingPhysics]

Wow. Professor Feynman, I am honored to have your support more than 30 years after you died!

[@richardfeynman4315]

@@FlippingPhysics I am retiring from the high school this year. So, it's good to know there are good young teachers around to teach physics. I made a donation in support. PS My real name is not Richard Feynman, of course LOL. It's a good alias. Most people have no idea who he is.

[@artinacart8035]

This is great! Well explained, silly, fun. This channel deserves some more recognition

[@EgoTeach]

I agree

[@hectichive889]

Thanks for the video! Really helping me with my physics homework! I had a question where I was trying to figure out the maximum angle a driveway could be above the x-axis before it started to roll down given a coefficient of static friction = 0.94. And I figured it out! I'm so happy rn, AP Physics is actually destroying me.

[@AustinoDLG]

Awesome video! My college physics class was stumping me (especially with friction).

[@FlippingPhysics]

Saweet! Glad to help you figure it out.

[@nisargpatel6604]

At first i couldnt tell they were all the same people. Kudos man

[@LiFELoG-f9q]

You are the best physics lecturers ever.

[@teresafielm]

2021 still useful for physics, thanks for the video you helped me a lot.

[@ankitshah1331]

This helped me SO MUCH! Thank you very much for your videos, and this isn't the first time your videos have come to my rescue

[@FlippingPhysics]

You are so welcome!

[@mattt1155]

Thanks for helping me with my phys prelab, Mr P! :D

[@yami.jx13]

"got it in my notes.. somewhere" LOL he never takes notes!

[@yajjhajhria3558]

He also never wears shoes.

[@simranr.]

how did you keep your phone up while moving the ramp?

[@flickwood6248]

I was wondering why the "mg" cancel out?

[@lourdjurra3746]

U saved my life...thank you😩🥺

[@FlippingPhysics]

You’re welcome 😊 (Hyperbole appreciated)

[@MrBerlington34]

what would the dependent variable be in this experiment?

[@neilopfer5687]

Very well done!! Wish I would have had this type of explanation back in the 1970s when I was taking physics as an undergrad.

[@FlippingPhysics]

I would have loved that as well.

[@tutstorial8474]

I'm so thankful I found this channel, very educational

[@FlippingPhysics]

I am glad you found it as well!

[@alexandrat9848]

I have a question. Would changing the mass of the object affect the critical angle?

[@philwolffe]

Sooo how much force would be required to push a 100kg object up a 12 degree incline?

[@chuayixun9097]

after finding the coefficient of static friction , how do we find the normal force ? to find the normal force?

[@PhatzKitchen]

Hi. Your videos are excellent! Do you have anymore videos where you use phone apps to assist in simple experiments like these? I want my students to begin using their cellphones to learn science.

[@Jason-ke4jf]

Your vids help me so much. Thanks, man

[@FlippingPhysics]

You are welcome mr. starlight!

[@saadia4338]

How can we improve this experiment to find the coefficient of static friction between two surfaces? Please respond, anyone! Thanks in advance

[@TheMinerLife]

wait so basically to find the coefiicient of static friction its just tan(angle of incline in degrees)?

[@FlippingPhysics]

In this specific scenario, yes.

[@skylinex4719]

@@FlippingPhysics 8 years later and we are still getting responses. goat

[@meghna7975]

Wow such a great video! Thank you so much :)

[@FlippingPhysics]

You are absolutely welcome.

[@marcolcal]

Wow, this guys is great, and super funny. Bob is chill!!

[@FlippingPhysics]

Thank you!! I'll pass your kind words on to Bo.

[@oweznero]

Which application you used to find angle of inclined

[@FlippingPhysics]

It's the default iOS compass app. Swipe right for a level.

[@oweznero]

Flipping Physics thanks

[@donalmoloney2695]

@4: 10 why did you use mgsin(theta) instead of mg?

[@FlippingPhysics]

+Donal Moloney I have a video which explains that. www.flippingphysics.com/incline-components.html

[@islalrdz3190]

what app did you use for measure degrees? greatings from mexico! xx

[@FlippingPhysics]

+Isla Rodriguez iOS compass app, swipe right and you get a level. Greeting from the USA! I'm in line to vote in the election today. Wish our nation luck. 😳

[@lordcheese2574]

@@FlippingPhysics haha this comment did not age well

[@Weazelmania]

So this is way more though out for explaining but I'm still confused. I've been given a measure an object of 400g on a protractor of 20 degrees and an equation of sin/cos = u What's the coefficient of friction if I have no other measures to go off other than just an angle. Am I missing something here?

[@FlippingPhysics]

I do not understand why you are asking this question. Your question is answered by this video. That is what the video is for, to answer the question you are asking.

[@Weazelmania]

@@FlippingPhysicswell I don't want to say I'm a dunce but just utter confusion over the problem at hand. Physics is the weakest part of my scientific journey and it gives me complete brain fuzz. The materials I was given, I feel, were very half assed, so though I now understand from this that cos/sin is the answer, I still don't "get it" in that I'm looking for numbers that I don't see. All I have is an angle of 20 degrees which at the point the object started to slide down the ramp. So what am I not getting? No matter how many times I go over it it just isn't breaking through my mind barrier. I have no distances to work with. Am I being an idiot?

[@AMLennon]

I certainly enjoy your videos. I have a question based on this video. If a block is at rest on the incline plane at an angle of 30 degrees, would the maximum frictional force that would allow the block to stay in place be calculated using 30 degrees, OR would we have to find the minimum angle of the incline plane needed for the block to slide before we can determine the maximum frictional force? That is, find that minimum angle and then substitute it in the formula for fs(max) = UsMgcos (minimum angle needed for block to slide)?

[@refathbari7468]

These are some great videos!

[@FlippingPhysics]

Thanks!

[@geeblenhoff1]

is the coefficient of static friction always equal to tan theta or just in this case?

[@FlippingPhysics]

Just in this specific case.

[@utkarshkohli7429]

Could you state some errors or assumptions in this lab

[@FlippingPhysics]

How about this: www.flippingphysics.com/uncertainty-mu.html

[@utkarshkohli7429]

Flipping Physics are there any assumptions made during this lab?

[@sizzlinjalapeno]

Hahahah you had me cracking up at the song "Everybody brought mass".

[@FlippingPhysics]

Great! I hope it did not distract from your learning too much. 😇

[@sizzlinjalapeno]

Any plans to drop this fire?? 😂

[@wajdy2620]

I’m so confused. Why isn’t it just tan(theta ) what was the point of everything else

[@FlippingPhysics]

In the end, we prove that the coefficient of static friction between the book and the incline equals tangent(theta). The point is that you need to _understand_ how to solve for that.

[@yousefchaudhary5080]

dude soooo gooood! thank you!

[@FlippingPhysics]

Thank you and you are welcome!

[@annalotic3944]

Best! gonna show to my siblings!!!!

[@יאירליבנה-פ8ח]

Wait, if the u=tan(ø), how does different materials have different u values? Where does it manifest in the equations? P.S: GREAT VIDEO! I especially like the simulation of the class' students in the back :)

[@FlippingPhysics]

It does not manifest in the equations. Mu depends on the materials of the interacting surfaces. See: www.flippingphysics.com/mu-intro.html

[@chanakyasinha8046]

Bro i just wanna say.. I got one my type of physics understanding guy , its you 😎.. I love discussing quantum Mechanics and wants to go in every detail to unify macro level physics to micro.

[@chanakyasinha8046]

Very nice and enjoying way of learning... Bro u make me visualise the force in real world, those force arrows gives clear insight whats happening around. 😊

[@Praveenstein]

that's good but u didn;t tell how the inclination angle is equal to the sinO or cosO that you're substituting ....

[@FlippingPhysics]

I have an entire video which goes over that: www.flippingphysics.com/incline-components.html

[@bharat_kachroo]

Great video. Thank you.

[@valentinanongthombam3810]

Hey bobby u r great...!!! Keep it up I really support your system of teaching and learning 😊😊😊

[@FlippingPhysics]

Thanks. Are Billy and Bo doing okay as well?

[@valentinanongthombam3810]

I am learning with them 😁😁😁together.... Even makes learning better with them Good job Dear

[@FlippingPhysics]

That is awesome. Glad you are learning with my students!

[@valentinanongthombam3810]

He he....!!!! Keep it up Sir

[@alejasgo]

Thank you , it was really helpful. You have a new sub.

[@FlippingPhysics]

You are welcome. Thanks for becoming a subscriber. I hope you can continue to learn from my content.

[@Hairysteed]

Here I was calculating all the force components relative to each other and all I had to do to find the coefficient was plug in the TANGENT OF THE INCLINE?!? *flips table*

[@EvelynsEstates]

i was thinking the same thing 😂 i know some people need to explain their work but i just need the basic part lol !

[@clippingandwhiffing]

my mind is blown i finally got it at 1:30am because of this thanK

[@FlippingPhysics]

I hope you got some sleep!

[@kgolanekgotlelelomarota7682]

Bobby the whole video😮

[@ShockingPikachu]

Thanks mate this video helped a lot :)

[@FlippingPhysics]

You are welcome, mate!

[@sakibshaikh9304]

Who are the 2 girls on either side of whiteboard? Nice explanation BTW !!

[@FlippingPhysics]

Those are my children. You are essentially looking at my workplace here and I have adorned my "desk" with pictures of my family. Glad you enjoyed my explanation.

[@vaiterius]

You sir are awesome

[@gagglz]

Thank you!

[@mgasukihanwa841]

Good stuff here

[@IbrahimOmar-me7yf]

Thank you bro you help me

[@richardkennedy3470]

The effect of gravity is weight and points directly down, not at a right angle to the slope.

[@FlippingPhysics]

Agreed. Please see: www.flippingphysics.com/incline-components.html

[@asdf-ef8if]

Incredible!!

[@ninagarbarino3200]

you just saved my lab grade

[@FlippingPhysics]

I hope so!

[@prabalacharya4526]

Loved it!

[@FlippingPhysics]

Great!

[@sivapalansivaram9286]

So Impressiveee

[@FlippingPhysics]

Thanks!

[@gadisachala2468]

Sooo Good!!

[@FlippingPhysics]

THX!!

[@TritonTv69420]

good stuff

[@FlippingPhysics]

Glad you think so

[@JoseContreras-kj1re]

Im the student in the middle in physics but the student on the left in chem. Thank you so much for this video I hate physics so muchhhhhhhh!!!

[@FlippingPhysics]

Sorry to hear that. I hope I have mitigated some of that hate.

[@sjaoenvf]

very cool.

[@davesuarez7856]

5:11 Joaquin Phoenix Joker, 3 version of his personallity

[@justgoforit3081]

I saw a problem like this when I was studying for the FE exam

[@guillermoperez8882]

Thank you!!

[@FlippingPhysics]

You are welcome.

[@rishidevthakur5347]

Please explain to hindi language

[@coelmulready8212]

Turns out trig has real world applications after all

[@FlippingPhysics]

Of course it does!

[@jajinfla]

YOU ARE GRAT

[@broadcasting6315]

god i need to drop physics

[@johnalowoesin5036]

Lol Always headache but Interesting

[@noechoprime]

thank you for not sometimes speaking in russian like my physics teacher

[@FlippingPhysics]

Ich kann ein bisschen Deutsch sprechen, falls das hilfreich ist.

[@noechoprime]

@@FlippingPhysics NO

[@chanakyasinha8046]

Those long hairs 😀😀 reminds me of newton.

[@andrewclutch6217]

Nice shirt really kept me focused on you during the talking parts of the video. Also nice females in the corners of the board they served their purpose!!!

[@luisango2649]

Dealeof newton tire

[@HorizonSpeed26]

interestingly this is the answer to 2017's 2nd frq question

[@HorizonSpeed26]

which I got right saying it is equal to tan(theta).(in a practice run this day (in 2018))(that's too many parenthesizes).

[@seanbedel7694]

Bro I'm done for.

[@ashleyvalentin3210]

That's me in the middle... lol

[@FlippingPhysics]

Me too.

[@hiia4553]

goat

[@parkhyengi4177]

jim carrey?

[@FlippingPhysics]

hi

[@parkhyengi4177]

haha thank you so much! Your video is really helpful!! and interesting

[@FlippingPhysics]

You are welcome!

[@jakemcguire498]

i still dont understand lol

[@angelicarobles4273]

same dude

[@No-cg9kj]

Please tell me you're a physics professor now.