Usually the problem is that the students don't understand the difference between force and energy, or the difference between mass and weight (or what is linear momentum). It is easy to remember that [in that class] a capital F means force.

Anyway, in sometimes it is useful to write more. For example teaching https://en.wikipedia.org/wiki/Consistent_and_inconsistent_eq... I try to write the full name of the classification at least for two clases. It is painful, but it is worth. I teach in Spanish, so we have also the problem that underdetermined is "indeterminado", so a capital "I" can mean "Inconsistent" or "[I]underdetermined" or in one of the following clases "Independent" (like in a linear independent set of vectors, yes they mix this too). So it is important to use the full name (or a long enough abbreviation) until you are sure that everyone can understand which "I" you are writing.