In the case you are talking about, Dick (say, a high wing Cessna), it is due more to the thrust/drag couple. Acceleration affects are only transitory - once the acceleration is compplete, the aircraft still wants to pitch up, until you have re-set the trim.
If you want to have a really fun discussion, draw a picture of a Piper Warrior (wing, and most of the airframe
below the engine's thrust line), ask people to draw in the thrust and drag forces (i.e. thrust above drag) ... and then ask them why it still pitches up under increased thrust. I did three years instructing on Warrors, and this was always a fun question to ask!
Notso Fantastic for one who has done advanced physics, I would think that you wouldn't need a gentle reminder that any change in velocity (e.g. a pitch up without a speed change)
is an acceleration
