Physics 121 2017 Practice Problem of the Day:

These problems are for practice only. They are selected especially to be illustrative, tutorial and diagnostic. Always attempt to work the problem on your own before you look at the solution.

Updated Oct 1, 2017: Added problems for Cycle 2.


CYCLE 1:

  • 28 Aug: P01: One-D particle motion (medium easy). Being able to do this problem perfectly in about 10 minutes corresponds to "basic competence" ("B"-work).

  • 30 Aug: P02: Two blocks hanging in an elevator (medium hard). Being able to do this problem perfectly in about 10 minutes corresponds to "basic competence" ("B"-work).

  • 01 Sep: P03: One-D motion of a particle (medium easy). Being able to do this problem mostly correct in about 10 minutes corresponds to "adequate competence" ("C"-work). If you can finish the problem flawlessly with no help at all within 5 minutes, that's closer to "A-level" work.
  • 02 Sep: P04: One-D Motion Plots (medium hard). Being able to do this problem exactly correct in about 10 minutes corresponds to "basic competence" ("B"-work).
  • 05 Sep: P05: Tension and Three Blocks (medium). Being able to do this problem exactly correct in about 15 minutes corresponds to "basic competence" ("B"-work).
  • 06 Sep: P07: Block with Friction (medium-easy). Being able to do this problem in about 15 minutes corresponds to adequate understanding ("C"-work).
  • 07 Sep: P08: Truck Pulls Box (medium). Being able to do this problem with complete confidence in about 5 minutes corresponds to basic competence ("B"-work).
  • 08 Sep: P10: Two blocks, two forces (medium-easy). This is Problem 5-1 from the Online Notes by RWB. Being able to do this problem with complete confidence within 10 or 15 minutes corresponds to basic competency ("B"-work).
  • 09 Sep: P11: Two blocks, Tension Forces (medium). This is Problem 5-2 from the Online Notes by RWB. Being able to do this problem with complete confidence within 10 or 15 minutes corresponds to basic competency ("B"-work).
  • 10 Sep: P12: Multiple blocks in a Chain (Medium). This is Problem 5-3 from the Online Notes by RWB. Being able to do this problem with complete confidence within 10 or 15 minutes corresponds to basic competency ("B"-work).
  • 11 Sep: P13: Friction on a block (Medium-Easy). This is Problem 7-1 from the Online Notes by RWB. Being able to do this problem approximately right within 10 or 15 minutes corresponds to adequate competency ("C"-work).
  • 12 Sep: P14: Tension and Buckets (Medium-Easy). This is Problem 8-1 from the Online Notes by RWB. Being able to do this problem perfectly right within 5 minutes corresponds to mastery ("A"-work).
  • 13 Sep: P15: Two Blocks, Pulley (Medium Easy). This is Problem 8-3 from the Online Notes by RWB. Being able to do this problem perfectly right within 10 minutes corresponds to Basic Competence ("B"-work).
  • 14 Sep: P16: Free Fall, Blocks, Tension (Medium, little tricky). This is Problem 8-4 from the Online Notes by RWB. Being able to do this problem perfectly right within 10 minutes corresponds to Basic Competence ("B"-work).
  • 15 Sep: P17: Car Coming Over Round Hill (Medium-Hard). Being able to do this problem perfectly right within 10 minutes corresponts to Mastery ("A"-work).

    See Also: Nine Practice Problems for the First Hour Exam: (Course Document #11)


    CYCLE 2:

  • 03 Oct: P18: Projectiles Thrown (Medium-Easy). Being able to muddle through this problem within 20 minutes corresponts to Adequate understanding ("C"-level work).
  • 04 Oct: P19: Projectiles Motion Max Height (Medium). Being able to solve this problem basically right within 10 minutes corresponts to Basic Competance ("B"-level work).
  • 05 Oct: P20: Block on an Inclined Plane (Medium). Being able to solve this problem correctly within 20 minutes corresponts to Basic Competance ("B"-level work).
  • 06 Oct: P22: Black Hole Orbits (Medium). Being able to solve this problem correctly within 20 minutes corresponts to Basic Competance ("B"-level work).
  • 07 Oct: P24: More Blocks and Wedges (Medium). Being able to solve this problem perfectly with no errors within 20 minutes corresponts to Mastery ("A"-level work).
  • 11 Oct: P25: Circus Physics (Medium-Easy). Being able to make good progress toward solving this problem within 25 minutes corresponts to Adequate Work ("C"-level work). Important note: there seems to be a sign error in the calculation of the potential energy on the left side. The term l sin theta should have a negative in front of it.
  • 12 Oct: P26: Particle on a 2-D Path (Medium). Being able to make good progress toward solving this problem within 25 minutes corresponts to Basic Competance ("B"-level work).
  • 13 Oct: P28: Atwood's Machine with Massive Pulley (Medium). This is a standard problem involving a massive pulley. Gettingthe answer correct in 20 minutes of work corresponds to basic competance (B-level).
  • 14 Oct: P30: Canonball into a block of wood (Medium). This is sort of a classic problem. The problem is complicated because it requires breaking the problem into two steps: a collision and then a rise up Getting the answer correct in 30 minutes of work corresponds to basic competance (B-level).

    See Also: Twelve Practice Problems for the Second Hour Exam: (Course Document #11)


    CYCLE 3:

  • Cycle 3: Third Hour Exam 2011:
  • Cycle 3: Third Hour Exam 2013:
  • Cycle 3: Third Hour Exam 2015: