Algodoo

This one is VERY powerful. Simple but effective. Even with 2 large reduction "gears" this motor moves the ferris wheel at an impressive speed. The ferris wheel is just an example, feel free to extract the motor and place it on anything. I can almost guarantee it will be too strong. To decrease it's overall power select the two springs and increase their dampening values (ex. from -20.000 to -2.000). The negative dampening is what powers the motor. You do not need to press anything to start this one. If you want it to go in a certain direction give it a pull in that direction when it is starting. Cheers!