/sci/ - Science & Math

>>8969578
why is there a force when I turn my fidget spinner around, is it the same reason why spinning object are more stabile?

If you sit in a rotating chair and take a bicycle tire and spin the tire, the chair will spin in the opposite direction.
A body of a helicopter with a single main rotor will spin in the opposite direction and uses tail rotor to counter balance this.

I did two experiments with fidget spinners. I took marble and placed it on the top of the spinner and spun it. I expected the marble to start spinning in the opposite direction, but nothing happened.
I took two spinners, stacked one on top of the other and spun the top one expecting the bottom to spin in the opposite direction, but this did not happened. I also spun the bottom one and the top one did nothing.
Why is this?