Flexure. The capacity to bend and yield, and return to its original position.
Flexible, That which will yield; springy.
Fore and Aft. Lengthwise, as from stem to stern of a ship.
Formation. The shape or arrangement of an article or thing.
Formulated. Put into some eonerete form, or so arranged that it may be understood.
Frictionless. Being without a grinding or retarding aotion.
Fulcrumed. A resting place for a lever.
Function. The duty or sphere of action in a person, or object.
Glider. An aeroplane, without power, adapted to be operated by an aviator.
Governing. An element which is designed to control a machine in a regular manner.