On Monday, I helped three or four different students for 90 minutes non-stop. Questions varied, from conceptual questions (pertaining to the extra credit lab assignments) to homework problems. Most students are still trying to wrap their heads around how certain forces affect the system, and drawing free body diagrams seem to be best for helping them see what forces cancel out and how forces affect one another.
On Friday I had similar experiences with two more students. Mass on an incline questions were also a common type of problem that students had difficulty with.
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