(Previous Version) AP Physics 1: Rotational Kinematics Review

[@TheMakennaChanel]

"good morning" he says as I watch this video at 10pm the night before the ap test

[@FlippingPhysics]

Morning is a state of mind.

[@2KingsMV]

I have never not wanted to relate with someone more than you

[@hidogsonroblox]

@@2KingsMV good luck today lol

[@kadhirtheengineer]

it is for the people that are watching it at 4 AM the day of the AP exam

[@klyx8826]

This is what I am doing right now😂

[@tessaholderman4622]

wow he's really out here just saving my life the day before the Ap test. what a blessing

[@JohnSmith-wz1ev]

Tessa Holderman here

[@omarmurillo5087]

Good luck to anyone reading this!!! AP Physics test is in 4 days from now. This is very helpful, short, and straight to the point. Thanks!

[@annatobon3394]

are you really in ap physics if you don't call alpha "fishy thing"

[@carultch]

Try spelling your name (αννα) as fishy - funky v - funky v - fishy.

[@sahanakumaravelu1677]

my teacher calls it "jesus fish"

[@samuelunderwood5286]

So much better than my physics teacher. I wish I found this channel more than a day before the exam.

[@daniellelevine1437]

+Samuel Underwood I feel u

[@PoTommyPo]

+Samuel Underwood +Danielle LeVine hahaha the physics gang is all here

[@samuelunderwood5286]

Good luck tomorrow guys.

[@PoTommyPo]

Same to you man. Wherever we are in the world, whatever our lives may be like, we face the same torture tomorrow. Back to stuDying

[@FriesDotExe]

May the physics gods be with us all

[@ninja9202]

AP test tomorrow, I would just like to thank you for putting up these great videos.

[@LilahEffron]

As a junior in college physics, this man is better than any physics professor you will ever have.

[@FlippingPhysics]

The fifth in my set of AP Physics 1 review videos. Enjoy! #PhysicsED #flipclass #APPhysics1

[@NeokingTech]

I love how you address many common misconceptions, such as with angular velocity and translational velocity at 3:48. You're awesome man!

[@FlippingPhysics]

+Neoking Thanks. I try to address common misconceptions as much as possible!

[@hayley2332]

Dude this is perfect. Too bad I just found these the night before the test. Still it's good for a quick concepts review!!

[@MrBaconPancakes]

hayley2332 It will take nothing less than an act of God for me to pass this test :/

[@ryancrazy1]

+XCAviation It's my night before the test...... howd you guys do

[@faariszuberi3906]

How d u do?

[@kidistabebe1744]

how was the test?

[@carolinakerber7678]

These videos take a concept that I couldn't understand in three weeks of teaching and review it in a way where 8 minutes is magic.. Might actually pass the exam tomorrow!

[@FlippingPhysics]

+Carolina Kerber You will pass the exam today!

[@Amanda-tomyi]

Oh god it's a desperate me from 2017. The test is on Tuesday for me but this is legit super useful! Wish I found this earlier, you're way more interesting and better at teaching than my physics teacher. Thx man

[@FlippingPhysics]

Dude, you are welcome. Glad you found them so useful. Any chance you could "like" the videos for me? That way students are more likely to be able to find them earlier next year... Good luck tomorrow!

[@paigeg2109]

5:31 mindblowing stuff there 9:00 10:47 bottom right hand corner

[@GhettoWorms]

It's unbelievable how well you teach the material . When I watch your videos the concepts are conveyed so easily. Can't thank you enough!

[@FlippingPhysics]

+Anti Photon You are welcome. And I agree, you can't thank me enough. 😀 (That sounds snarky, however, I just meant it to be funny.)

[@kingofafrica7015]

“Good morning” ye good morning but it’s the morning of the ap exam and I’m binging ur videos 💀💀

[@victoriayang9588]

felt -- two more hours until doom

[@sebg1542]

@@victoriayang9588 facts, the test is tmr and im cooked

[@knight0351]

this is the only physics class i have seen that was smaller than mine

[@benflis1618]

I find it funny that you have under 30k subs and when my brother found me watching your videos, he said you were a savior to him. The odds of both of us finding you without telling each other are pretty low 😂 Also, with your style of video, I don’t understand how you don’t have a bigger audience. You seem like a Tyler Dewitt or PatrickJMT caliber guy!

[@FlippingPhysics]

Thanks for the kudos. My audience grows ... slowly. Spread the word!!!

[@benflis1618]

Flipping Physics I’ve told a bunch of people in my class about you and a lot of them have begun watching your videos 👍🏽

[@Mahmood7204]

It's the day before the online AP physics exam :( , I have been watching your videos the whole year and wanted to say thank you for putting all this effort in. Your videos really do help the most!

[@jodiesovereign2965]

Saving my life before the AP exam, thank you!

[@joanyoon4672]

Thank you for addressing typical misconceptions that come with learning physics!

[@timkang6338]

It's that time of the year again. I think I prepared myself well and you definitely helped

[@Taco_cat1239]

My toxic trait is believing im gonna go into this test after watching these videos and doing no other studying and get a 5

[@03303j]

did you get a 5 lol

[@Taco_cat1239]

@@03303j I did not get a five

[@sebg1542]

ong im doing this rn lmao

[@brodiemorris2081]

test starts in 5 minutes for me 😭

[@19AdiTube]

Day of the AP Physics 2020 Exam!! Tysm for this :)

[@matthewbrennan3127]

Thank you very much for these videos. Rotational motion is one of my weak points that I'm trying to improve on.

[@FlippingPhysics]

You are welcome. Glad you are working to better educate yourself!

[@rebeccapasquarelli511]

Really helpful, especially since it's the first year the class is running!

[@laurenw6088]

I love this series. It's pretty easy to understand all the concepts, since you explain them so clearly! Studying for the AP exam tomorrow. Good luck to all you others doing the same! I came across these videos only a few days ago, but I recommended them to a lot of my other classmates.

[@FlippingPhysics]

Thank you so much for your recommendation. That, along with likes, subscribes, and shares, is what will help students find the videos earlier. Enjoy the exam today!

[@damega621]

Taking the test in two days, these videos have been a blessing

[@FlippingPhysics]

So glad to help!

[@damega621]

@Flipping Physics Took the test and it went really well. I'm so glad I watched these videos as a final review to finalize my preparations for the exam. They were extra helpful

[@rebeccareich4784]

Can we take a tangent moment to appreciate his mismatched pairs of socks? Also, this videos are a life saver, thank you!

[@shirkalati6328]

+Rebecca Reich I love the fact that these "student" characters came to school with no shoes.

[@FlippingPhysics]

+Shir Kalati Socks are better than shoes. Good luck today!

[@maguirehodgson8244]

Good luck on Wednesday guys!

[@gayathrig1048]

not me watching all his videos with my exam in 2 hours and understanding more than I have this entire year.

[@FlippingPhysics]

definitely not

[@tobijames4698]

Its too late for me my friend 😂😂😂

[@mirrorizen]

Very helpful for tomorrow's finals. Thank you!

[@mary-clarkmatthews7893]

i'm reviewing for my physics exam... in college. thank you so much mister🙏🏻

[@FlippingPhysics]

You're very welcome!

[@isaiah5089]

Im in college right now and you saving my life for real, god bless

[@FlippingPhysics]

Wonderful!

[@aek7723]

Very helpful, using this for my Intro Physics class at a University.

[@musiclover6481]

THANK YOU!! Your video is fun and entertaining and educational. Really helped me review for my physics finals :D

[@FlippingPhysics]

You're very welcome!

[@romerobryan83]

sweet editing

[@JorgeMartinez-xb2ks]

One of the best productions I've seen in the last years. :)

[@FlippingPhysics]

Wow, thanks!

[@albertramon8565]

Great video. Would be more helpful if you did practice problems showing how to use each equation. Other than that phenomenal job.

[@shirkalati6328]

AMAZING and very helpful editing in this video especially! This is awesome!

[@FlippingPhysics]

+Shir Kalati You are welcome again, my dear.

[@tomscott8]

AP Physics 1 tomorrow, then AP Physics 2 the next day :D glad to have to here to cram!! :D Thank you!

[@Dan-gc3ke]

+tomscott8 That makes no sense, how are you taking AP Physics 1 & 2?

[@lomna17]

+Alex Rider some people take ap physics 1 first semester and then physics 2 second semester. IMO in a high school setting physics 1/2 have a lot of depth in conceptual understanding, a little too much for one year as it is unlike physics B, being more thinking and less amth

[@tomscott8]

+Alex Rider my teacher thinks that the AP physics 1 curriculum is far too restricting with its lack of right hand rule and restriction in content, so at my school most people take regular physics, than AP physics 2, and after your done you can take both tests since physics 2 goes over the same content thats on the AP 1 test and more.

[@juanirra9062]

How's here right before the exam in a few hours????

[@charlesevans6106]

Glad I found this series, even if it was just last night. I've got the exam today and I'm just hoping to pass at this point. TBH I'm probably gonna come back and watch the rest of the series after the test cuz they're actually entertaining and cover lots of topics in a short time.

[@FlippingPhysics]

That's awesome. I do my best to keep myself entertained while I make the videos in an attempt to keep you entertained while you learn. Enjoy the exam today!

[@rith2757]

One of the best reviews and study material ever, thanks :)

[@FlippingPhysics]

You are very welcome and thank you for your kind words!

[@faithvillarreal1564]

Still using these in college ;-; thank you for your videos. saving me rn hours before my final

[@FlippingPhysics]

Best of luck on your final my friend!

[@rohitnutalapati2104]

Hey these videos are actually quite useful! My AP Physics 1 test is tomorrow and it's too bad I found these only a couple days ago but I'll be back for more next year for AP Physics 2! Fishy thing xD

[@FlippingPhysics]

I love Fishy Thing! Do me a favor, "like" the videos for me and increase the chances other people will avoid the same pitfalls you did and find the videos earlier in the year. Please? Good luck tomorrow! p.s. Take AP C if you can. In my opinion it is a more useful class than AP 2.

[@breumann4835]

You're amazing and a life saver and I'm never going to think of angular acceleration w/out "fishy" again.

[@FlippingPhysics]

You've got to say it like Billy though. _Fishy Thing!_

[@nasirkhalid6770]

Is HZ the same as revolution per second ? if so that means the equation w=2πf is just converting the angular velocity from revolution per second to radian per second. So Why are we defining f if it's just w(omega) in different dimensions ?

[@FlippingPhysics]

A mass-spring system has frequency in Hz or cycles per second. A mass-spring system cannot have anything in revolutions per second, it does not make any sense. Therefore, frequency is not angular velocity in revolutions per second. Though they are certainly related because simple harmonic motion and circular motion are related.

[@fahadalawadi8627]

When you define uniform circular motion as a circular motion whose angular velocity is constant, of course by constant you mean constant in magnitude and direction since it's a vector quantity, Right?

[@FlippingPhysics]

Yes. Because angular velocity is a vector, a constant angular velocity will have a constant magnitude and constant direction.

[@armstrong4154]

It seems everyone will only find this channel a day before exam. Terribly sad! This dude teaches better than my physics teacher with just a short 10 minutes!

[@FlippingPhysics]

Then I suggest you watch more of my videos. I have plenty!

[@Jason-ke4jf]

Cool! Any plans to do a review series for AP Physics 2?

[@FlippingPhysics]

+Jason Starlight Nope. Sorry. No plans for an AP Physics 2 review series.

[@jessepollard1816]

Good luck on the exam everyone!

[@isaacstillman1920]

about to take my final, been watching for the whole year now. you are awesome

[@FlippingPhysics]

Thanks for learning all year. Good luck in May!

[@vishalgupta895]

You are the best teacher in the world

[@FlippingPhysics]

I enjoy your hyperbole. Thanks for the compliment!

[@baileyhewson]

good luck tomorrow guys

[@conspystery6998]

Thanks for making these!! I finally kinda understand this!

[@FlippingPhysics]

You are welcome. I am hoping for better than "kinda", hopefully that will come with time.

[@Tai_Phan]

I am looking at the lecture notes that are on your website, and i see that you have T^2 = (4pi^2Lcostheta)/g, but i am looking on the equation sheet from college board that it excludes the costheta. I don't want to sound like an idiot, but which one is correct?

[@FlippingPhysics]

You are looking at two completely different equations. My assumption is that the equation you are looking at on the AP sheet is the period of a simple pendulum. What I derived here is the period of a conical pendulum. Do entirely different things.

[@Tai_Phan]

@@FlippingPhysics ok yep i see that. Thank you for the clarification!

[@abdullahaddous7081]

8:40 Mr. P, isn't the velocity of an object in a circular path 0? The speed, however, isn't. Doesn't the circumference represent the distance covered in one cycle, rather than the displacement of the object in one cycle? I always assumed v=wr and v=2pi*r / T was relating to the tangential *speed*, not tangential velocity. One last reason I find velocity = 2pi*r / T and velocity = wr confusing: you said that tangential velocity changes even in uniform circular motion, which makes sense. However, velocity=2pi*r / T and velocity = wr assumes that velocity does not change, since r and T does not change in a uniform circular motion and neither does w change in uniform circular motion. However, we know that tangential *speed* does not change. So, dont you think these 2 equations relate tangential *speed* to w or T and r. I'm sorry if this comment was lengthy, I'm just trying to connect different concepts of physics together! Also, love your videos!

[@FlippingPhysics]

I think what you are missing is that when we refer to the tangential velocity of an object, we are referring to the _instantaneous_ tangential velocity. Sure, the _average_ tangential velocity for a full revolution is zero, however, that is not at all helpful as far as analyzing the motion of the object. For example, when I draw the free body diagram on the stopper, it is at one instance in time, therefore, the tangential velocity is instantaneous. Hope that makes sense!

[@abdullahaddous7081]

@@FlippingPhysics Thanks for the reply! I still dont quite get it :( The circumference is scalar. The period is scalar. How do we get a vector by combining them using the basic operation? How does an expression of only scalars evaluate to a vector quantity?

[@fawazahmad2303]

Well, 2017 now, and here I am, the day before. Good luck to the few, the brave.

[@FlippingPhysics]

Yes, good luck to you... Enjoy the exam tomorrow.

[@gouriswetha3738]

Squeezing in some last minute review with an awesome tutor! Wish me luck on the exam tomorrow!!! So scared 😭😥

[@FlippingPhysics]

You don't need luck. Breathe. Let go of your fear. And enjoy the exam today!

[@kaushikdr]

I love this guy!

[@FlippingPhysics]

💋

[@bobmarley9905]

2:40 wait wouldn't the mass when it reaches the top when spinning in a circle on a string have the highest angular velocity compared to the other points in the path cuz centripetal force is maximum there and Fc is proportional to w^2?

[@carultch]

If it were in uniform circular motion, then angular velocity, linear velocity, and centripetal acceleration would all be equal at every point throughout the circular motion. However, in this example, gravity is a factor that will speed the object up as it approaches the bottom, and slow the object down as it moves upward. You could counteract this to some extent by applying work with your hand as it ascends, and letting friction slow it down as it descends. But if the non-conservative forces are negligible, it will speed up as it descends, and slow down as it ascends.

[@mistermomo2904]

its febs rn, studying real early for the ap test (cool emoji)

[@FlippingPhysics]

Congrats on getting started early/

[@mistermomo2904]

Flipping Physics lmao it was cuz I had a test today. Great video btw editing was awesome

[@daytonenloe2926]

7:30 Bro casually stops time and breaks the laws of physics to teach us somn real quick

[@FlippingPhysics]

The things I do to help y'all learn...

[@pranjalsingh2002]

These really helped for the test! But the test was really hard!

[@FlippingPhysics]

Pranjal Singh Yes. The AP Physics test are *always* really hard. That's because they are curved tests involving tens of thousands of people.

[@AllenHubbard]

Great stuff!

[@FlippingPhysics]

Thanks! 👍

[@tylorbray]

9:30, to which side of the triangle are you referring?

[@FlippingPhysics]

The side of the triangle which is labelled, r for radius.

[@bowenying2391]

AP Test tmrw...

[@russleeful]

Question: why is Bobby's mouth always open?

[@FlippingPhysics]

That is just who he is.

[@nadezhdadimitrova4042]

why is the component in the y direction equal to 0, at around 8:19 of the video?

[@FlippingPhysics]

+Nadezhda Dimitrova Do me a favor, ask your question more carefully. For example, the component of what? Once you determine that, then think about the equation for that and consider for yourself why it might be zero. Let me know what you get...

[@nadezhdadimitrova4042]

+Flipping Physics Tension force in the y-direction. A more specific question will be why the acceleration in the y-direction is 0?

[@FlippingPhysics]

+Nadezhda Dimitrova The tension force in the y-direction is not zero. With regards to the acceleration in the y-direction, what is the equation for acceleration?

[@stumbling]

Non-transitive socks! If you say that the colour of the sock on a right foot beats the same colour sock on a left foot then Billy, Bobby and Beau's socks are non-transitive! Billy's socks beat Bobby's, whose in turn beat Beau's, whose in turn beat Billy's.

[@FlippingPhysics]

+CowLunch Wow, dude. Took me a bit to figure out what you meant, however, once I did ... yeah, funny. Thanks!

[@gauravmallya2075]

AP Physics test tomorrow good luck everyone!!

[@FlippingPhysics]

And good luck to you!

[@aaryasinhvaghela1907]

Thank u sir

[@kevingrady1087]

very good

[@youtubedragon679]

Let’s get it i got 12 hours til the exam

[@kakemilksheikh9737]

wish i found these earlier omf!!!

[@HorizonSpeed26]

came here for pre cal was not disappointed.

[@FlippingPhysics]

good.

[@saricity980]

its all making sense now...something the books never taught me...

[@FlippingPhysics]

That is great. You do realize I have a lot of videos about rotational motion, right? www.flippingphysics.com/algebra.html#cm

[@saricity980]

I will check them out, thanks!

[@AbiRashiida]

That bandana tho

[@Channel-dp3wc]

Lets go

[@AnPham-wr1td]

Help I'll die in AP test

[@JP-xm3qf]

it's good, but it goes too fast

[@FlippingPhysics]

Try turning on subtitles. Reading might help with understanding.

[@lovishchhura958]

Sir,i like ur video and i want to see more videos on rotational motion,pleaz send me a like or website please-

[@teotak]

Ha I call alpha "fishy" too

[@FlippingPhysics]

It is quite logical to.

[@mehedihasan-nw8hg]

too fast

[@FlippingPhysics]

Try turning on the closed captions so you can read the words as I say them. It should help.

[@rolylopez3980]

Who here from Raker?

[@christianancona2347]

Mr. Noyes did a better job teaching this then you

[@FlippingPhysics]

I am pleased you hold your teacher in such high esteem. Unless "Mr. Noyes" is your pet squirrel. In which case I have concerns for your sanity.

[@CorbinTinnon]

Why you be roasting Christian 🤔how about we squash this beef dawg and learn some physics

[@AryanP]

"good morning" he says as I watch this video at 9pm the night before the ap test