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: OneD
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: OneD
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 "Alevel" work.
02 Sep: P04: OneD
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 (mediumeasy). 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 (mediumeasy). This is Problem 51 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 52 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 53 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 (MediumEasy). This is Problem 71 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 (MediumEasy). This is Problem 81 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 83 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 84 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 (MediumHard). 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 (MediumEasy). 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 (MediumEasy). 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 2D 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 (Blevel).
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 (Blevel).
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:
