Rotational kinetic energy | Moments, torque, and angular momentum | Physics

Rotational kinetic energy | Moments, torque, and angular momentum | Physics | Khan Academy

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Күн бұрын

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In this video David explains what rotational kinetic energy is and how to calculate it.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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Пікірлер: 57

@ehatipo4598 7 жыл бұрын

You might be the greatest Physics teacher ever.

@vintagescorpio49 7 жыл бұрын

You just might

@SaffatUllah Жыл бұрын

No cap

@IAMINSIDEYOURWALLS604 Жыл бұрын

Shut up! Tusk act 4 rotate his balls!

@joaocastro924 4 жыл бұрын

I love that this guy can teach us for free, and still a much better job than my mechanical engineering lecturers that are being paid 90quid per hour

@Lazarus_The_NPC Жыл бұрын

My Physics teacher just assigns us Khan assignments and Edpuzzles, and poorly teaches the lessons. He’s a nice teacher, though, just not very good at his job.

@_ryle. 3 жыл бұрын

Khan Academy really does in fact teach me that I can learn anything! Thank you :)

@DavidDiaz-qx5wi 7 жыл бұрын

So helpful, many thanks!!

@tseringangle21 7 жыл бұрын

Thank you for doing physics lecture. Please keep doing more lectures.

@allisonlee8178 3 жыл бұрын

So so so so clear! Thank you

@muhammadyasrabaziz1982 2 жыл бұрын

thanks... these lectures really help me in flourishing my concepts about physics terms

@VaishaliVijaybabu 6 жыл бұрын

THANK YOU SO MUCH !

@jaiso434 6 жыл бұрын

excellent. thanks.

@edwarddi3833 4 жыл бұрын

great video! thanks Khan!

@ninaciriello8346 Жыл бұрын

I went from making D's to A's in my physics class because of your physics videos, thank you so much!

@MercenaryRandoms 4 жыл бұрын

I love this guy's lectures. The other guy with that surfer-dude voice always beats around the bush too much.

@davisjohn1517 6 жыл бұрын

THANK YOUU

@logabharathinehruraj7317 4 жыл бұрын

I think you are the next Einstein and a good teacher too😁😁😁😁 THANK YOU

@ami8190 3 жыл бұрын

I LOVE THIS MAN. HE IS THE BEST TEACHER EVER I'M ALWAYS EXCITED

@itaynevo4353 5 жыл бұрын

Beautiful

@ThierryMaurel-qi8sf 5 ай бұрын

Top notch explanation

@datpham31415 5 жыл бұрын

tnx :))))) it helped

@anthonytafoya3451 2 жыл бұрын

Thank you my brother. Long live the king!

@paoisaacleo882 8 ай бұрын

Beautiful ❤️

@virupannamedikinal Жыл бұрын

Thank you

@tanmayvad7393 6 жыл бұрын

Can u explain why the surface integral of a sphere is in terms of the eccentricity rather than the radius ?

@jimmyalderson1639 6 жыл бұрын

Could you integrate angular momentum to get angular kinetic energy?

@aumvashisht2269 3 жыл бұрын

nope, L =MVRSin(theta) and kinetic energy of a rotating body is 1/2 Iw^2 but the relation between gular momentum and kinetic energy is L^2= 2I/K.E

@Mimi-xv2zg 2 жыл бұрын

Thank you 😊😘

@munachisoosuagwu9630 2 жыл бұрын

THANK YOU SO MUCH🤍🙌🏿

@hufsa239 6 жыл бұрын

Nice

@Aba9846 6 жыл бұрын

Great explanation. Thank you!

@JosueA_455 2 жыл бұрын

in minute 3.06 you mention that velocity is directly proportional to the radius. When we talk about angular momentum and there is absence of torque, angular velocity is inversely proportional to the radius. Why is it?

@abre.ham121 5 жыл бұрын

Why is here Angular speed constant every where? In the previous lesson you said radius and Angular speed are inversily proportional (e.g skating

@ufwliz_xo 2 жыл бұрын

Thank you!

@kenny98brt 2 жыл бұрын

I love you bro !!!

@deoczidGONI 3 жыл бұрын

What is the difference between this and the Magnus effect/force?

@bryanchristian5849 2 жыл бұрын

11:34 where can i see the derivation?

@konozrashid887 2 жыл бұрын

If an object isn't anchored at a point i.e it's rotating freely without any pivot, will it always rotate about it's center of mass, no matter if it's an irregular shape?

@abhijit9546 2 жыл бұрын

Can anyone explain why omega is same for Every particle?

@muhammadyasrabaziz1982 2 жыл бұрын

🤔🤔

@murtazamushtaq529 6 жыл бұрын

awesome but not availiable on official site of khan acADEMY

@dagmawiwondimu6857 Жыл бұрын

in MLS they play with there foot not hand. And they don't throw they shoot

@priyeshajha9820 Жыл бұрын

Why does the same momentum give extra energy in the form of rotation?

@TrueBlackHistory101 4 жыл бұрын

So why do moons/stars spin backwards creating an angular problem?

@ale-lx9gp 6 жыл бұрын

What if I told you, I'm making a java program and I am now FORCED to learn about kinetic energy for it! WHY?!

@kevivmodi7019 3 жыл бұрын

"I'm making a java program" rip

@ozzyfromspace 4 жыл бұрын

You won’t find a baseball with a diameter of 14cm (nearly half a measuring rule) 😂 Otherwise, good video mate Edit: after a quick google search, I think you accidentally took the diameter of a MLB baseball and used it as the radius. I only checked because the numbers sounded funny to me. Best wishes mate!

@kalpeshb3603 3 жыл бұрын

maja aagya sir

@grahamflowers 2 жыл бұрын

There is no kinetic energy in a moving mass there is force Mv squared kinetic energy is the energy of consistent work from a consistent force regards Graham Flowers

@ethanmayo399 2 жыл бұрын

FYI--You said the diameter was 7cm but you used 7cm as your radius.

@lumiwang955 5 жыл бұрын

It's quite hard to believe that, say the baseball flying has a kinetic energy of about 116J, and all these energy came from the one hurl that the sportsman threw (likely within 1s and within 1m of arm movement)? This kinda infers that the sportsman used (more than) 116J in that short period of time!!! According to my treadmill, it would take about 10min to run at a speed of 8.5 km/h to use that much energy. Can a baseball go as fast as 40m/s?! I know that badminton can go really fast but they are much lighter. ------ Update: I made a mistake in units. Running on a treadmill at 8.5km/h for 10min would spend about 100 kCal, not J.

@bfnv9972 5 жыл бұрын

They can travel at 40m/s... while rotating. So, it basically has the speed of 40m/s, but its velocity is not that big.

@sivitham1713 2 жыл бұрын

🙏🙏🙏🙏🙏

@youdontknowme9184 Жыл бұрын

Arigato, Gyro

@GeorgeOu 7 жыл бұрын

All the martial artists who claim that rotating and screwing the fist will add damage to a punch can shut up now.

@quentingraillet3744 6 жыл бұрын

That way you can pull your arm back faster, it also increases the likeliness of a punch causing, or aggravating a cut, and causes your shoulder and deltoid to twist up and cover your jaw. That plus the fact that a punch should be delivered with the palm facing down (less likely to damage your wrist like that), and you don't usually hit from a palm facing down position, so you should be twisting your arm anyway. Don't trash talk people and what they're doing if you don't know anything about it. Sorry for my bad english.