Moment of Inertia and Angular velocity Demonstration #physics

Professor Boyd F. Edwards is demonstrating the conservation of angular momentum with the help of a Hoberman sphere.

[markthani]

That smile at the end is called... Passion

[behlockaetheking]

This is how figure skaters spin, they tuck arms in for fast multi spins, and reach out for graceful, slow spins

[arseniix]

This is how neutron stars get their astonishing rotation speeds, some of them rotate at like 42000 rpm

[darennickle]

This was my college physics professor! Dr Boyd Edwards!! Guy was a legend and was a perfect example of a good, passionate professor

[BeigeOfficial]

If only physics in school I went to were taught in this passionate, sweet manner I wouldve paid much more attention. Great job, Dr. Edwards. We need many more teachers like you.

[thassalantekreskel]

Short version of why this works: If you think about it, both configurations have the mass moving through the same amount of space in a second. It just so happens that when it's expanded that space covers fewer degrees of rotation as the same amount of space when it's contracted does.

[yippiekayakotherbuckets]

To anyone who wants to know the math behind this:
Angular momentum dictates that a spinning object's linear velocity should remain the same even if you change its radius.
According to the equation w=V/R (w being angular velocity, V is linear velocity and R is radius), as V remains constant, the larger the radius, the lower the angular velocity.

[WEISSMANGAMING]

I would enter in his class even though I am not one of his student because he deserved this kind of praise😆😆 kudos to this beloved teacher🤗🤗

[keithrobertson]

If you’d like to witness inertia in all its glory, go to a state government office

[anonymousfranklinaggot]

You can feel this when you spin in an office chair. If you tuck your legs in you spin faster than if you stuck them out.

[Sps_hexa]

IW= constant so that W= constant/I, it means if I will decrease then W will increase. W= angular velocity, I= Inertia, BTW good example

[plking]

It's amazing how much u learn when ur not forced to learn things.

[micahjacobson]

You can tell how proud he is of his example from the smile at the end, and he should be, this is a great demonstration

[Quick-Flash]

this guy was my physics professor in university.

[chiragtambade]

Hence Angular Momentum is conserved, as no external force is applied.

[aycoded]

I love how satisfied he looks with that smile

[DerpyDaringDitzyDoo]

That's actually a really cool demonstration of that effect, something even children could understand easily.

[Cosmiiiiii]

"Inertia is a property of matter" - Bill Nye Intro

[GeorgeCowsert]

This is also a little engineering trick to keep in mind, since this applies to gears and levers and the entire reason concepts like torque even exist.

When you draw a set of circles, the bigger ones will obviously have a longer perimeter. That means that any speed going along that perimeter needs to be transferred through some form of 1 : 1 gear ratio, or you can abuse the relation between speed and distance to artificially create one in exchange for the other.

[MrClubjub]

THIS WAS MY PHYSICS PROFESSOR FROM UTAH STATE UNIVERSITY! Love this guy!