And wordy definitions I think are a must
Though, my physics teacher actually marks papers, and she's said:
All explanation answers in CLEAR dot points, markers like that
and don't be too wordy. Some explanations can be done mathematically, and sometimes only take one line and a Q.E.D.
She's said that you lose marks if you contradict yourself, which can happen sometimes in a long explanation, so it's better to be short and effective.
But yeah, summaries on the sheets is encouraged, but simple ones with actual information and not ready made answers.
Make sure it's easy to manipulate into the questions. Avoid stock answers, because under exam pressure, you don't want to lose marks for relevance when you're basically saying the right thing in the wrong way.