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My teacher once drew a diagram of a box sitting on a TABLE, so the box wasn't at floor level. There's obviously a downward force for the box because of gravity. However, because there's a downward force, there must be an upward force as the box is still. Where is this upward force coming from...

not very significant - you don't want to bomb it because that can drop your average by 1-2 points. If you do well, nothing much'll happen. It's just then you won't lose those 1-2 pts. The impact it'll have on your grade will be very minimal compared to the other assignments, however, so you...