Physics 13.5 Angular Momentum (1 of 11) What is angular momentum? Basics

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When someone asks who my physics teacher is, I say Michel Van Biezen

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[@MichelvanBiezen]

Ahmed, Thank you for this comment. With comments like yours I am being reminded that these videos not only help people around the world but they also bring the world closer and makes the boundaries between people disappear. It makes us all one and that may be the greatest reward of these videos. Keep up the hard work.

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That's pretty inspiring sir

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it's the first time writing on youtube in my life. Your lecture is truely the best. Now I found my way to survive in my physics class. Thank you so much sir. God bless you.

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Best Teacher ever!!!! I have in my life for physics. Hats Off to you

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Best Physics videos on youtube

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I have watched many of your videos and couldnt find these among them, searched alot about angular momentum in youtube, but belive or not i just hoped you had these videos availible as you did, Thank you so much Michel van Biezen! I and thousands around the world will say that you are not only a good teacher but a great person!

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The best physics video among all videos out-there

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Thank you so much! I've been watching your videos all semester and you've been a life saver. My professor's lectures can be very confusing, but you are crystal clear and help me understand these problems and concepts thoroughly. Thank you :-)

[@MichelvanBiezen]

Mariah, Thank you for the feedback. I am glad these videos are helping.

[@Aerospaceman]

So, here is a good example that illustrates the difference between two masses colliding and two rotating disks that collide. The before and after collision numbers for non-rotating masses must be equal; conservation of momentum. Then we have two rotating disks and we have "L" angular momentum, based on the right-hand rule. I understand, thank you again. This is why I love your lectures.

[@genjii5803]

you've explained this concept 10x better than what my teacher could ever do, thank you. I have an Ap physics exam coming up and hopefully, this video will help give me a good score :).

[@MichelvanBiezen]

Glad it helped! All the best on your exam! 🙂

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Everyone please leave a like for this guy. He really works hard and he is amazing. Liking all his videos show appreciation. I think we owe him atleast this much in return of good knowledge and help in our work. Thanks guys! And thank you sir for helping us all out, keep up the great work!

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literally learned all of first year uni physics from this guy

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your smile really helps me understand physics ! , I don't know how that works exactly, but am 100% sure with a positive teacher I can learn way more, however, when the teacher looks angry and too serious its completely the opposite, even sometimes I skip class and study at home instead cause Its more beneficial for me! Thanks for the videos and keep smiling sir :D

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Hi I just wanted to let you know I really appreciate and enjoy your videos! I'm in the first year of my physics degree and they have really helped me a great deal. The way you teach is very pleasant and that I really admire how much effort you put into your videos and how consistently brilliant they are - considering how many there are of them! I really can't express my appreciation enough and am just commenting to say that you've really made a difference to my learning and that I hope you continue making these videos so others can have the benefit of them too. If there is somewhere I can donate to support you, let me know.

[@MichelvanBiezen]

Helena, Your comment is very much appreciated. I have always wanted to be a teacher and KZbin along with the internet has now given me the ability to reach a lot of people around the world. With comments like yours it gives me great satisfaction and assurance that people around the world are benefiting from these videos. With such affirmation I will gladly continue to make many more videos on different subjects. Thank you for taking the time to let me know that these are making a difference in your life as well as the life in others. Good luck with your studies and keep up the hard work. There are many rewards down the road when you obtain a physics degree, as well as the understanding of a science that helps you understand the universe. In the future with time permitting, I will also post videos on physics at a more advanced level so that undergraduate and graduate students can continue to benefit as they continue with their studies in physics.

[@JoseRamirez-cr6gz]

you are the best professor period. thank you for all you do Michel van Biezen.

[@MichelvanBiezen]

Thank you. We appreciate your comment. 🙂

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What an awesome series. Thanks for posting this information. You deserve a medal and beer.

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Thanks a lot for uploading. Wish you healthy , wealthy and keep uploading more excellent video . I love all of your lecture.

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BEST PHYSICS VIDEO

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how can someone dislike this video????

[@joeyGalileoHotto]

The 6 people who disliked it got a C in their Physics 1 course

[@supersonic174]

I want to know the logic by what is the reason for angular momentum to be acting up and down, where there is nothing moving up and down.. though I do not dislike this video, it would of been that much better to explain the logic, rather than the math.

[@nathanpayson9859]

@@supersonic174 We just give it an arbitrary direction rule to make our lives easier. If as a society we made the right hand rule the left hand rule, nothing would change physically, but our directions would change.

[@supersonic174]

@@nathanpayson9859 that's ok, except it lacks actual science.

[@lordspongebobofhousesquare1616]

@@supersonic174 science is not nature. Science is just our way in explaining nature. People agreed on how to represent angular momentum, and thus we represent it as such. It doesn't need to have a parallel in the real world, since the concept if angular momentum itself is human made.

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I never comment. But your videos are amazing and make me appreciate physics even more. Thank you, from South Africa!

[@MichelvanBiezen]

Welcome to the channel!

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Thank you, Michel. What you are doing is amazing. i can start watching videos of any topic you explain, and i end up mastering it at the end. Thanks again, Michel. Nasser,

[@MichelvanBiezen]

Nasser, Thank you for letting me know how these are helping. That makes all the effort we put into these videos worth it.

[@13identity]

Thanks for doing all these videos, you're an absolute life saver.

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thank you so much you legend!! you explain it 1000X better than most teachers

[@MichelvanBiezen]

Thank you. Glad you found our videos. 🙂

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Love your videos! You have helped me so much this semester!

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best physics lectures

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Please, can do a number of videos on concrete structures such as concrete beams, columns, slabs, and foundations. Surely, you could simplify things. Thank you,

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Thank you so much for your videos, learning heaps more than those uni lectures! :D

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thanks for the great vids- will be telling my entire class about your channel!

[@MichelvanBiezen]

+Katie Cao Thank you.

[@HakaTech]

+Michel van Biezen You said angular momentum is always conserved. But that is only the case if the torque is zero.

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These videos are fantastic thanks so much

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best physics videos

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nice video keep making lessons like this for us because we always learn from you not in our prof

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can you make videos about particle dynamics?

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Excellent. Found it. I'll watch the series.

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Great! Glad you found our videos! 🙂

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great videos before finals :D

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Thanks you sir your explanations are very clear and your method that focus on examples is very efficient.

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Your videos make me enjoy physics again :)

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Thank you so much, you just saved my life!

[@NikiKnight001]

thank you so much, this really helped me thanks for being an amazing lecturer

[@sjrory3784]

Using the two rotating objects colliding, you could actually find the combined angular velocity of both objects?

[@yeungarthur687]

thanks for solving my puzzles about angular momentum! :)

[@TheDenverjohn]

Hey, Sir! I really do love and appreciate your videos. Great job sir. Thank you so much. Looking forward for other higher physics concepts. :D

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thank you very much for making these videos they are such a great help to us, from south africa

[@MichelvanBiezen]

We are glad these videos are helping. Welcome to the channel!

[@gabrieladolfoacquistapace2900]

MUCHAS GRACIAS POR SU TIEMPO PROFESOR MUY LINDAS CLASES

[@MichelvanBiezen]

Glad you liked the videos. Welcome to the channel! 🙂

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Thank you for your great effort!!! Really helps!

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You are much appreciated sir. Your videos help me alot. Stay blessed

[@salihabusragunduz3464]

Hi there, I was wondering if you have solved a question about boats and their point masses. The question types I'm looking for are the ones asking a boat's initial distance to the shore after someone in the boat walks to sit near someone else (who doesn't move at all.) Hope I'm clear, thanks in advance

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your videos arw very helpful greetings from Türkiye

[@MichelvanBiezen]

Thank you and welcome to the channel!

[@jennastone9856]

Thank you so much this lecture was so clear and helpful

[@matsushitahisashi9616]

can we prove the conservation of angular momentum from newton's laws?

[@MichelvanBiezen]

Most laws of physics are based in experiment and observation. We observer the conservation of momentum and then we try to find the equation that descrbes what we observe.

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Thank you very much for these videos, sir.

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Thank you so much you have saved my degree

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Glad you found our videos and you found them helpful. Keep it up! 🙂

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thanks a lot.ur videos are reallly amazing sir...

[@abhishekpanchal5003]

Sir please make few videos on angular impulse

[@ImtiazAleem]

Great, Loved It.

[@LatinoPrototype]

Hi Michel! Would it be possible to make some videos on Shear Stresses and Bending Moments, as well as Strains on materials and stretching :)

[@MichelvanBiezen]

This playlist may have some of what you are looking for: PHYSICS 10.5 STRESS AND STRAIN

[@aishere9172]

Sir, which do you prefer more? Mathematics or physics? I have noticed that you are an expert at both but I am just curious. Please answer?

[@MichelvanBiezen]

+A “Sightseer” Is Here I like them both. Mathematics gives us the tool to solve the problems. Physics helps us understand the laws of the universe.

[@aishere9172]

Michel van Biezen Ok, that is true. Thank you for responding!

[@aishere9172]

Michel van Biezen But one more thing: what particular branch of mathematics is the most relevant in today's society, in your view of society? Thanks so much for your time if you do answer...

[@victorhuang7673]

u r the god sir

[@remiofficiall7015]

Thank you mr I really understand now😭😭

[@vanmathii4]

sir,in case of linear momentum the vectors made sense to me ,but for angular momentum the vectors points upward or downwards what does that mean

[@MichelvanBiezen]

If you watch the videos on the gyroscope it may help you understand: PHYSICS 13.6 THE GYROSCOPE kzbin.info/aero/PLX2gX-ftPVXVW0FlsGNnWJvK6asUBdC1R

[@towerheist73]

What would be the torque if i put a total of 5 kg chicken in a rotating disk with a mass of 7 kg and enclosed in a cylinder? The speed of the disk is 225 rpm and the working radius is 17 cm. Also, the chicken tends to be raised up and fall down due to force applied by the rotating disk. my English is bad.

[@rahultiwari9003]

sir what will be the angular momentum of a "rolling" disk about the origin of coordinate axis ?

[@MichelvanBiezen]

+Rahul Tiwari The angular momentum is always: L = I wI = (1/2) mR^2

[@MichelvanBiezen]

+Michel van Biezen L = I w and I = (1/2) mR^2

[@rahultiwari9003]

Sir but my book says the answer will be L(translational)MVR + L(rotational)(IW)=3/2mr^2 so what should I conclude from it ??

[@Odmandak]

+Rahul Tiwari different shapes have different coefficients of mr^2

[@bulentkirca3311]

Could it be possible to increase the ligthing level of the board. I believe it will be easier for us to read upon it. Thank you.

[@MichelvanBiezen]

Yes, we have improved the lighting over the years. The older videos did not have sufficient lighting.

[@klustereman3749]

There is a mistake in ur chemical kinetics series, people have commented on that video i think u haven't noticed it, please check it

[@xPinoyTribal]

Hey professor. You are very knowledgeable about physics. I am just curious on your educational background ? Thanks :)

[@albertyeung5787]

excellent

[@MichelvanBiezen]

Thank you.

[@visalgunaratne2296]

Hello, greatly appreciate the work you do.....so isn't L=mwr^2?

[@MichelvanBiezen]

+Visal Gunaratne That depends on the shape and mass distribution of the object. L = I w So what is I in this case?

[@visalgunaratne2296]

the moment of inertia....

[@Odmandak]

+Visal Gunaratne L = IW = I(V/r) = mr^2(v/r) = mvr

[@recall660]

playlist here too prof please and thanks

[@mubasshirahshaikh8630]

cleared all my doubts#thnx

[@paulperez9843]

Excelent

[@MichelvanBiezen]

Thank you. Glad you liked it. 🙂

[@prajwalsinha183]

Are these videos good for jee and for iit preparation...?please reply...

[@MichelvanBiezen]

Yes, they are for the understanding of the material. But the JEE exams require training on how to take the test. The problems in JEE are usually very hard and take more time to work out completely than you are given, and thus you need to learn short cuts on how to get the answer quickly. Our plan is to do a set of videos on how to do that, but not in the near future. We need to complete a number of topics first.

[@prajwalsinha183]

Ya but I have completed my basics of the chapter will it be it good to solve questions from resnick halliday..

[@prajwalsinha183]

And ie irodov

[@דירהלמכירהברעננהדניאלרימקס]

To michel Van Biezen If I have a question about how to calculate the moment of inertia and send a schematic drawing, how can I send it to you?

[@MichelvanBiezen]

Unfortunately, our schedule is maxed out with our multiple jobs and then working on the videos. We try to answer questions on the videos when time permits, but we don't have the time to respond to individual requests like that.

[@sashamuller9743]

thank you thank you thank you!!

[@Garret_bruh_homey]

Thank you , thank you, thank you.

[@Sam-ir6iu]

Hello Prof, why dont those terms in the numerator and denominator cancel out at the end of the problem? Thanks

[@MichelvanBiezen]

+Samuel Souto Why don't you try it and see if you get the same answer? (you won't) That is because of the addition in the numerator and denominator.

[@johnmcleavy3307]

MinutePhysics' video confused me a ton and I thought it was just because Angular Momentum is super hard to explain - nope, he's just a bad educator. Great explanation! Thanks again for the awesome videos!

[@ismaelnaruto30]

God bless you

[@rahultiwari9003]

Sir still I haven't understood why do we take moment of inertia as the equivalent of mass in rotational motion please help me out

[@MichelvanBiezen]

+Rahul Tiwari That is like asking why is F = m * a?Typically through experiments it was discovered that Torque = I * alpha

[@tobeynguyen2613]

You said momentum is always conserved, but doesn't it depend on the system? If there's an external force on the system, then momentum is not conserved...like if friction is an external force, for example...

[@MichelvanBiezen]

+Tobey Nguyen Momentum is ALWAYS conserved, there is no exception. When a snow ball is thrown against a wall and sticks to the wall, it APPEARS as if momentum is not conserved. Can you think of why momentum is still conserved in such a situation? That will explain why momentum is conserved when friction is involved.

[@tobeynguyen2613]

Yes, in that case momemtum is conserved because of your system. Only for an isolated system is momentum conserved. In a non-isolated system, momentum is not conserved. My professor makes us define our system and show that there is no net force (or negligible force) on the system before we can use conservation of mometum, or else we don't get any credit. www.physicsclassroom.com/class/momentum/Lesson-2/Isolated-Systems

[@jethior2232]

Take an example, when we throw mud to a wall they stick together and come to rest. In this case, momentum before is not zero but momentum after is zero. If it is not can solve this: 400g of mud is thrown to a wall with a speed of 20m/s. If the mass of the wall is 1000kg what is the speed of wall. Can the speed of wall be 0.008m/s?

[@bahaozsoy3690]

I have a exam. Thank you for videos

[@MichelvanBiezen]

You are welcome. All the best on your exam.

[@miguelparreira6017]

sir when you put i1*w10+i2+w20/i1+i2 wouldn't the "I"s cancel each other out ?

[@MichelvanBiezen]

+mike miner (FPS) The algebraic rules don't allow you to cancel that .

[@miguelparreira6017]

ok i didt see that ,thank you very much

[@gabrielgumede7222]

sir can u please do lagrangian machanics please it is a very popular topic in physics

[@MichelvanBiezen]

+Gabriel Gumede It is on the list of topics to cover.

[@gabrielgumede7222]

Michel van Biezen I would like to know when the videos will be published because I am writing on 8th of April an exam in lagrangian machanics please do something you the only lecture I understand I passed my first year physics major because of you without you I will fail this exam

[@MichelvanBiezen]

+Gabriel Gumede I work 3 jobs during the week so there isn't much time. I will try to make some this weekend and we will try to post them early next week. (No promises, but we'll do our best).

[@dilara50505]

Thank you Sir

[@redbean9410]

instant sub

[@dontmessaround1917]

Thank you :)

[@venubhonagiri1193]

how to become top in physics I mean what to do ?

[@MichelvanBiezen]

Just like almost anything else in life: Practice, practice, practice..... But in physics especially, understanding comes from doing problems on the topics you are studying.

[@jvdp9660]

Hey Michel, I wonder whether you are from Dutch descendance. Your name sounds really dutch.

[@MichelvanBiezen]

You are close. It is Flemish.

[@stonerdog962]

Why all those figures? Just give us the answer

[@aryoseno11]

Thanks sir!

[@vernonchean3602]

Thx

[@dianto3447]

Thanks!!!!!!

[@u2r4givenbyjc]

Love the videos, but the focus isn't clear so I was unable to see the last half of it clearly.

[@MichelvanBiezen]

Apologies, we had no experience in making videos when we first started this channel. So some of our early videos have video and audio issues.

[@KiaraKulkarni]

what an absolute g

[@MichelvanBiezen]

Glad you liked it. 🙂

[@kingplunger1]

got my phys 1 exam in 2 hours. practiced probably over 1000 problems, but I still feel sick... I just hope that the prof doesn't quiz some weird niche stuff, if thats not the case I should pass easily. exams should really be longer than 2 hours so more topics can be in it and the luck component is lessend

[@MichelvanBiezen]

Try to relax and let us know how you did.

[@kingplunger1]

@@MichelvanBiezen I will tell you when the grades come in. So far it was just very strange, probably between 2,0 and 3, 0. It felt like the writer of the exam designed it without any knowledge of what we had as homework etc. I obviously practiced the parts more that were also topic of the practice hours in the semester. No relative motion, no special relativity, no angular momentum etc in the exam which were all major parts of the homework. We had to leave one by one because of corona and when I got out of the room, basically everyone I heard was talking about how this exam was nothing like the one we got as reference. Don't get me wrong, it is okay to ask whatever was topic in lecture, its just wrong to give false expectations. and the one question about oscillations was basically just super difficult because we had to derive some super complex angle with cosines etc and the best practice for that woudl have been learning some sin cosine table by heart... I am a bit frustrated tbh

[@MichelvanBiezen]

Yes, we had those exams ourselves and they are very frustrating. That is why when i give exams today, I try to make them very representative of the major components that we covered during the semester.

[@kingplunger1]

@@MichelvanBiezen Grade is 2,3. Not too bad considering everything that could go wrong did just that. Well, its just one course of ~30 in the bachelor, I should probably just move on ;) E&M introduction next semester shouldn't be too bad with your playlist + books and lecture

[@marcbagenor7099]

That bow tie though

[@azizkash286]

I love you

[@GarbageMan144]

I thought I=mR^2

[@MichelvanBiezen]

Not for a solid disk. Different shaped objects have a different moment of inertia.

[@GarbageMan144]

@@MichelvanBiezen oh ok, thanks for responding

[@slavicziggurat1057]

different shapes have different coefficients of mr^2

[@Peter_1986]

Were you trying to simulate the passing of time on 11:40-11:42? Haha. 8-)

[@cjaune909]

W