http://www.youtube.com/watch?v=U9BsOW6P7QM&feature=sub
Quote from: onthecuttingedge2005 on November 29, 2009, 08:10:22 PM
http://www.youtube.com/watch?v=U9BsOW6P7QM&feature=sub
omnibus , where are you ?
is it a proof ?
Take a longer glass plate without any magnets as a declining ramp and you will get the same result! The problem here is, that the difference in potential energy between the starting point end the end position is used to overcome the sticky point.
Zonk
Neat;
Experiments should be performed that use the runner's momentum
to translate to another path, so the runner does not need
to go through the array in reverse, to get back to beginning.
That's the real experiment.
:S:MarkSCoffman
Bonsoir à tous, :D
Belle réalisation Gilles, tu nous à encore fait du travail de pro,
Te prépares tu à boucler le machin ??
A+
Gravity indeed needs to be compensated. Add an upward ramp just like he downward one, to come level with the starting position. If the object rolls up it, with velocity to spare, permanently out of reach of already passed magnets, we got OU, as it could just as well start a new pass on an identical smot. Yet, the object seems to roll down the ramp a bit withheld...
Quote from: Cloxxki on December 01, 2009, 05:21:51 PM
Gravity indeed needs to be compensated. Add an upward ramp just like he downward one, to come level with the starting position. If the object rolls up it, with velocity to spare, permanently out of reach of already passed magnets, we got OU, as it could just as well start a new pass on an identical smot. Yet, the object seems to roll down the ramp a bit withheld...
I think the withheld down-roll is intentional by Gilles, the ramp's material seems copper covered lamination (printed circuit board?) and the rolling object induces eddy currents in the copper below it (the rolling object also includes cylinder magnets, does not it) so the down rolling is breaked by Lenz law.
Possible reason for this break is to save the rolling object from falling apart like earlier when it escaped from the sticky spot, it falled down and got apart.
rgds, Gyula
Slowing an object down is easy enough to do. I don't see the point for it here. Wouldn't he want to loop the smot? Let the object roll up higher than it started with velocity zero, and you've got the holy grail. Yet, he chooses to let it roll down, slowly. Lots of energy transfers and drama, resulting in a loss. Like a soccer match ending in -1 vs -1. Who wins? In the search for OU, even if there is no loss, no points are rewarded for "remise" games, right?