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Classical Mechanics Midterm 1 and Newton’s Laws

Classical Mechanics Midterm 1 and Newton’s Laws. Midterm 1 Exam Discussion Class Schedule Unit 4 Relevant Equations and How to use them… Unit 4 Homework Hints…. First Midterm “Take-home” due on Friday. Prepare notes Take exam in timed situation Answer questions that were incorrect:

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Classical Mechanics Midterm 1 and Newton’s Laws

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  1. Classical Mechanics Midterm 1 and Newton’s Laws Midterm 1 Exam Discussion Class Schedule Unit 4 Relevant Equations and How to use them… Unit 4 Homework Hints…

  2. First Midterm “Take-home” due on Friday • Prepare notes • Take exam in timed situation • Answer questions that were incorrect: • Letter response in spaces provided. • Written response for each answer. • Brief justification for answer to conceptual questions (1,2,3,7,9,15,20) • Show all steps in responses requiring calculations. State input data and relevant equations.

  3. Midterm Exam 1 “Score” Distributions

  4. Exam 1 Problem Difficulty

  5. 22/48 correct

  6. 42/48 correct 11/48 correct 41/48 correct

  7. 37/48 correct 43/48 correct 31/48 correct

  8. 31/48 correct 32/48 correct

  9. 36/48 correct 32/48 correct 31/48 correct 12/48 correct

  10. 24/48 correct 9/48 correct

  11. 28/48 correct 32/48 correct

  12. 33/48 correct 12/48 correct 26/48 correct

  13. How difficult was the exam overall? • Most difficult exam that you ever encountered. • Moderately Difficult • Fairly Easy • Easiest Exam that you ever encountered.

  14. How much time should we have had to complete all problems? • 50 minutes • 75 minutes • 90 minutes • 120 minutes

  15. Given sufficient time I could have correctly completed “most” of the problems • True • False

  16. What percentage of the questions were “fair”? • 100% • >80% • >60% • >30% • 0%

  17. Course Schedule: October

  18. Course Schedule: November

  19. Course Schedule: December

  20. Main Points

  21. Main Points

  22. Main Points

  23. Newton’s 2nd Law Acceleration is caused by force. A bigger mass makes this harder

  24. Unit of Force Kinematics units Dynamics unit

  25. Newton’s 3rd Law

  26. Force on Two Masses • A force F is applied to a small block, that pushes a larger block. The two blocks accelerate to the right. Compare the NET FORCE on the block with mass M, to the net force on the block with mass 5M. • A)FM < F5M • B)FM = F5M • C)FM > F5M a 5M F M

  27. Force on Two Masses Net Force • A force F is applied to a small block, that pushes a larger block. The two blocks accelerate to the right. Compare the NET FORCE on the block with mass M, to the net force on the block with mass 5M. • A)FM < F5M • B)FM = F5M • C)FM > F5M Same acceleration, so larger mass has larger net force. a 5M F M

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