Sum of torque

[EOW]

Hi dieter, I will explain later my last message, density 0 is vaccum. I come back with my friction. The goal is to accelerate 2 sprockets in the labo frame reference without energy. The support turns clockwise at w so sprockets turns counterclockwise in the support reference. If I can reduce the angular velocity of sprockets, I win energy because they accelerate in the labo frame reference. I use a bad quality roller chain for that. There is friction in the roller chain, the wheel lost angular velocity and the support receives a clockwise torque.  I can use a special roller chain, friction exist only when I curve it, no when I straigth it.

[EOW]

The support receives don't receive a torque. Each sprocket receives a clockwise torque. There is friction when I curve the chain but no friction when the chain become a straight line. Forces I drawn don't come from an external device it's the link that force the chain to be like that. So when the support don't turn, the chain lost energy in friction (it's an energy) and each sprocket has a clockwise torque on it (it lost kinetic energy or apply a negative torque on the motor). But here, the clockwise torque increase the kinetic energy.

[EOW]

With gravity and an asymetric container:

[dieter]

Hi EOW,


Ok, I  think I understand the last one. Centrifugal force may be insignificant at low RPM.


Happy New Year!

[EOW]

Hi Dieter,

Happy new year you too !

I think the last case with water, the device don't work because while the support turns the red/white container don't work.

For 2 sprockets + roller chain (post #92), if I guess no friction except between links of the chain, and I guess the chain is tensioned very high, the friction between links gives heating (this is an energy), this heating  come from the lost of angular velocity of each sprocket. But sprocket turn only in the support frame reference, not in the labo frame reference. So the friction increases the angular velocity of sprockets. The only thing to verify is the support musn't receive a torque like that the support don't lost a kinetic energy.

Maybe it's possible to place magnets on each sprocket, like that magnets attrack parts of chain, the sprocket lost kinetic energy (in labo frame reference, the sprocket win kinetic energy) and there is heating. For "eject" the part of chain that is magneted when the chain becomes straight, I can use the centrifugal force, the sprocket will lost angular velocity and the part of the chain becomes straight ? Like that I don't need a chain, just one disk and small stems around the disk: