Newton's Laws -- common questions

I had about ten visitors today for office hours, all asking questions about their current unit, Newton's Laws. Several students asked about a WebAssign question pertaining to apparent weight, but after explaining the concept to them in a conceptual way, I noticed that they were able to develop a much greater understanding. Most of the other issues were in the setup of questions, particularly free body diagrams. I always stress that writing a free body diagram is absolutely necessary, even for the simpler questions!