April 22, 20206 yr I'm looking at the AP Mech C practice FRQ: https://apclassroom.collegeboard.org/29/question_bank/create/preview/item/1320757 On part c, the scoring rubric says "1 point is earned for [graphing] a pair of quantities that could be used to determine g - students must graph measured, not calculated quantities." Does this mean that graphing k∆x vs. Msinθ would not earn the point? If so, that would deviate from past AP Exams, would it not?
April 23, 20206 yr Graphing the empirical k_delta_x vs. Msintheta would work, but not the theoretical. They want you to determine an empirical value for g, not do a mathematical exercise that results in a 1=1 proof.
April 27, 20206 yr Author Graphing k∆x vs. Msinθ would result in a slope of g. Not a slope of 1. But since k must have been calculated, the wording of the rubric makes it sound like this solution wouldn't count.
April 27, 20206 yr Right, but it's ultimately a proof of 1 vs. 1, not an empirical derivation of g. You're proving something is itself if you use theoretical values.
April 27, 20206 yr Author I'm not following you, Fizziks. None of the graphed values (k∆x vs. Msinθ) are theoretical. k - must be calculated somehow, based on measurements of force, displacement, and/or the like ∆x - measured M - measured θ - measured sinθ - calculated What theoretical values are you referring to?
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