Notes on AP Labs Honors read these too

Labs were pretty good , many excellent but here comes the "but"

1) Please include calculations in body of report or, if you must, NEATLY done on easily identifiable separate sheets.

2) When drawing tangents to find slopes extend tangent line to edges of graph to get most precise results . A 1 mm error is 10% of 1 cm, but only 1 % of 10 cm.

3) In this lab you were asked to compare your measured acceleration with g x hanging mass/ mass of cart. It should have said g x hanging mass/total mass, where total mass = mass of car plus hanging mass .... after all they are both being accelerated by the the force on the hanging mass. Many of you ignored this question simply because it was not one of the numbered questions and appeared early in the lab.

4) Everyone dutifully said that the slope of the velocity vs time is a, but almost no one used this slope to answer the question referred to in 3 above.