I have the following to wheels that rotate on the same axis:
Assuming that they are stuck together, if I rotate the green one the red one rotates at the same speed and when I stop the green one the red one stops.
I'm looking for the name of the mechanism that makes it so that when I stop rotating the green wheel and I hold it in place, the red one keeps turning.
PS: I'm building a flywheel (represented here by the red wheel) and the green wheel here is connected with a belt to a crank. I want to make it so that the flywheel keeps turning even when the crank is fully stopped.