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Mechanics Free Response Question #3 Solutions - AP Physics C 1998 Released Exam
(18:50)

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This Free Response Question includes the following concepts: Free Body Diagrams (or Force Diagrams), Static and Kinetic Friction, Tension, Force Normal, Force of Gravity, Newton’s Second Law (many times), a Multiple Bock System and a Pulley.

AP® is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product.

Enjoy an EDpuzzle Lesson for this video.

Link: AP Physics C 1998 Released Exam
The problem is on pages 159 - 161 of this pdf.
Their solution is on pages 191 - 193 of this pdf.
Please enjoy my solutions as well.

Content Times:
0:22 Describing the Problem
1:24 Part (a) Drawing the Free Body Diagrams of the Whole System
1:58 Part (a) Forces of Gravity (or Weights)
2:22 Part (a) Tension Forces
2:53 Part (a) Normal Forces
4:06 Part (a) Friction Force(s)
4:56 Answering Part (a i) through (a v)
6:02 Part (b) 1st Net Force Equation
7:22 Part (b) 2nd Net Force Equation
8:20 Part (b) 3rd Net Force Equation
10:35 Part (c) Describing this part of the Problem
12:19 Part (c) The only Net Force Equation for Part (c)
14:37 Part (d)
15:29 Part (d i)
16:27 Part (d ii)
I made a video called, “8 General Suggestions for the Free Response Questions of any AP Physics Exam.” And then I proceeded to make video solutions to the 3 Free Response Questions of the 1998 AP Physics C Mechanics Exam and I learned a valuable lesson.  I should have given 9 suggestions.  I should have added a 9th suggestion: “Read Carefully.”

I find it quite funny that I didn’t read carefully enough because (1) for years it is something I berated my students about and (2) it is something I did not do on the third free response question.  You see, I didn’t answer part (a) completely.  I missed the small word “magnitude”.  I simply drew the forces in the Free Body Diagrams, however, I didn’t explicitly solve for the Magnitudes of the Forces.  All the magnitudes of the forces are in my solutions because I had to find each one to solve the rest of the problem; however, I didn’t quite answer part (a) correctly.  I did put the complete solution in my solutions. :)

I don’t know how the AP graders would grade my solution because all the physics is there, just not in the right places; however, I do feel they would not have given my solution full credit.  So, please learn from my mistake and read the questions carefully.  Don’t have to eat humble pie, like me.
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