Midterm 3 (Fall 2019)

[I'm trying something new for Midterm 3. One of the goals of this course is that students have the opportunity to learn and improve. Therefore, I'm shaping the grading on Midterm 3 to reflect that goal.]

I will not curve Midterm 3. However, students have two methods improve their scores.

• Any student can earn up to half the points lost for each problem on the exam by doing the following:

  • Complete the Dynamics Exam Wrapper. You only need to do this once, not once per problem.

  • For each problem where you want points back:

    • Write out your first solution to the problem (pictures/photocopies are okay). Indicate the point where your approach went wrong.

    • Write out the complete correct solution. [Note that a correct solution that is merely a copy of the homework problem and/or the crowdsourced solution (see below) will not earn points.]

    • Please indicate the reason/reasons why you think you lost points

      • Trouble with vectors and vector notation

      • Algebra or arithmetic errors

      • Problem with free-body diagrams

      • Lack of understanding of the concept

      • Not knowing how to apply the concepts to this particular problem

      • Careless mistakes

      • Other (please specify)

    • You must turn this all in by the start of the Final Exam (noon on 12/16). For those who are taking the final early, you still can wait until the 16th, though obviously you'll benefit most from doing this work before the final!

• Any student who posts the correct solutions to the exam in the comments (below) has the opportunity to gain bonus points. Some quick caveats:

  • Each student can only get bonus points for a single problem. So there's no benefit to posting more than one answer (other than helping your fellow students).

  • The first person to post the correct solution gets the points. I will be the one deciding on correctness (and will indicate the correct answers).

  • To post a "correct" solution, please indicate which problem you're solving. What you need to do depends on the problem solved:

    • For worked problems, the "correct" solution solves all parts of the problem all the way to the end, including figures, governing equations, the final answer and units.

    • For true/false problems, the "correct" solution explains why the answer is correct, and also explains why the other option(s) are not correct.

    • For Midterm 3, the bonus points are as follows

      • Problem 1 [Ball with external force]: 1 bonus pt

      • Problem 2 [Rigid body planar motion]: 1 bonus pt

      • Problem 3 [Spinning wheel]: 1 bonus pt

      • Problem 4 [Is ω the same?]: 1 bonus pt

      • Problem 5 [Spinning disks and friction]: 2 bonus pts

      • Problem 6 [Cylinder and Spring - HINT: Homework problem 18-25]: 3 bonus pts

        • Also, a correction: the displacement should be 90 mm to the left.

      • Problem 7 [Bullet and Disk - HINT: Homework problem 19-30, only easier]: 3 bonus pts

      • Problem 8 [Ring with Backspin - HINT: Homework problem 17-120]: 3 bonus pts

    • Note that Midterm 3 had two (slightly) different versions. You only need to submit the solutions to your exam (but I will not be giving bonus points for each version, just the first submitted).