I have a 4-way cross/medal that I was told is the combination of a miraculous medal and the brown scapular.
A Ferris wheel moves from a gravitational force which moves the axle, thus, making the wheel rotate swiftly. 2 people found this useful.
Turn a wheel at the rim and the force you apply (red arrow) is multiplied to give a bigger force at the axle (blue arrow). The bigger the wheel, the greater the effect, because the radius of the wheel works like a lever. The bigger the wheel, the longer the lever, and the more leverage you get. Turn the wheel at the center, instead, and it works the opposite way. Now the rim of the wheel goes further and faster. That's how you can use a bigger wheel to multiply speed.