Power, work and the other definitions at school aged 13.
Force equilbrium and newtons laws school aged 15.
The fact that any physical system can be explained by just looking at the energy contained in it. Aged 21 at my graduation, speach by some old hairy shipbuilder, a look of dawning came across half the engineers present and ment nothing to any of the rest. Was a bit erked that a 4 year Uni degree can be sumarised in one sentance but hey ho.
How these basic concepts fitted in with aircraft aged 29 when I did the ATPL's.
Every sim check we do we maybe get 100-200 questions on this sort of stuff and other subjects in the ATPL. So you do get used to answering these types of questions.
