@markandrews1219
All other demonstrations I have found on this topic show that when the direction of torque is reversed by a change in direction of spin, the person rotates in the opposite direction, not stopping as in this demonstration. It seems viable that the system should stop for a moment as the change in direction of the force could result in a moment of zero velocity until time and force in the new direction results in a new net force and momentum.
@ricomajestic
The Fresh Prince of MIT!
@kshitizsingh5241
when you flipped the wheel in clockwise direction you were also rotating in clockwise direction. how?
@carlosaf9975
(2:06) PLEASE I need a rapid response... Regarding you are spinning clockwise... wouldn't that be -2L ??? Furthermore, you don't spin the opposite direction of the wheel at any time, do you ????
@KingAusarII
Thanks a lot, Will Smith!
@auntyIdontknow
Does the same happen with out holding wheel, simply by tippy toeing?
@chandapandya9698
The error in this video is at the last demonstration when he says the wheel has an angular momentum of positive L , actually it is negative L ( if u observe the wheel close ly) and so when he flips it ,the system rotates with an angular momentum of -2L.
@popayed
What makes l to l,not -l. How does wheel know it is turning right or left.? And if you take wheel when it is upside down,i mean -l does it act like l?
@guangshuobulian
Cool video Ryan!! Clear explanation and great camera performance.
@sarthaksharma9322
when you spin for the first time same thing happens right?
@philsnell104
Ryan defines positive angular momentum as spinning counter-clockwise. When he flips the wheel through 180 degrees, he has changed the angular momentum of the wheel to -l. He says that he needs to acquire angular momentum of +2l in order to conserve the angular momentum of the system. Yet he spins clockwise, not counter-clockwise. Is this not the opposite direction from that predicted? He does not describe his motion with the labels and illustrations he used on the wheel, to show how he is spinning with angular momentum of +2l. What a pity. I am now thoroughly confused.
@samanthaknepp7049
Is the mistake that you say angular momentum measures both how hard it is to start and how hard it is to stop spinning? We know momentum doesn't measure how hard it is to start the motion.
@vinayseth1114
Is this a standard pedagogical tool used in the US- Because the recommended videos section is showing me a lot of videos on other physics-related channels with the same demonstration- is this demonstration also used in American schools to clarify the concept?
@victorfreitas4692
That is awesome!!!
@hitren86
The explanation in this video is wrong. After flipping the wheel, he spins in a clockwise direction, implying that his angular momentum is negative. Since this angular momentum is in the same direction as the total angular momentum, the initial angular momentum of the wheel has to also be negative, which means that he misstated the initial direction of the rotation of the wheel. It's very difficult to tell since the wheel he is using does not have a white marker (it should!), but if you look closely, you can see that the wheel is initially spinning clockwise.
@adosar5414
when you are in the ground angular momentun is conserved?
@TheAnimammal
The mistake is that angular momentum is not conserved. Angular energy is conserved.
@rommel23nb
great video-- I will try it with my class
@HarshvardhanNigam11
so cool . tnx a lot for explaining
@DiscoFang