WW2 R.A.F. Squadrons generally consisted of 12 aircraft available, although there were operational variations. Depending on role, the squadron would be made up of 'A' Flight and 'B' Flight, each of 6 operational aircraft. On fighter squadrons, the Flights were sub-divided into sections, eg, Red Section, Blue Section, etc, of 2-3 aircaft, again depending on operational requirements.
Simple machines provide a vocabulary for understanding more complex machines. A simple machine is a mechanical device that changes the direction or magnitude of a force.
1. ( 1 used with a singular or plural verb) a cutting instrument for paper, cloth, etc., consisting of two blades, each having a ring-shaped handle, that are so pivoted together that their sharp edges work one against the other (often used with pair of).