Glycerin. Glycerin is an ingredient that can be found in many beauty products because of its moisture locking properties. It is a form of sugar alcohol that is available naturally in vegetable oils and can also be the byproduct of soap making.
Definition of wheel and axle : a mechanical device consisting of a grooved wheel turned by a cord or chain with a rigidly attached axle (as for winding up a weight) together with the supporting standards
The formula for the mechanical advantage of a wheel and axle is: MA= radius of wheel. radius of axle. A small force on the wheel produces a larger force on the axle. A large movement of the wheel edge produces a small movement of the axle.