Find 
and simplify.
Definitions:
Ratchet Wheel
A wheel or gear with teeth cut in a way that allows motion in one direction only, often used in mechanisms requiring incremental movement.
Pawl
A mechanical component that engages with another component to prevent motion in one direction, or to drive a mechanism intermittently.
Center
The point that is equally distant from all points on the circumference of a circle or the surface of a sphere; in geometry, it's the midpoint of any shape or object.
Balancing Point
The point at which an object is in perfect equilibrium under the influence of gravity and does not tip or rotate.
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