ChemPhys 273 - Semester Review

First Semester, 2007-2008


Background Information

The physics exam for ChemPhys 273 will be held during the week of January 14 - affectionately known as "Finals Week." The exam will be a 90-minute exam covering all topics learned during the first semester. The exam will be started the moment the exam period begins and will be collected at the end of the 90-minute exam period; extra time will not be alloted. If there are special circumstances that require that you need additional time, then see Mr. Henderson privately before the day of the exam to discuss those circumstances; unless such arrangements have been made in advance of exam day, no extra time will be given.

Most of the questions are multiple-choice (approx. 70); there are approximately 10 problems to solve. Many of the multiple choice questions include up to 10 possible choices - from a through e and such choices as ab, ac, ad, etc. Planning to guess on questions is unlikely to be a wise alternative to planning to prepare. The exam answers will be placed on ScanTron forms. Each section/Mods will have a separate form of the exam with nearly identical or at least very similar questions. The exam is not likely to be curved; it would not be surprising if there were a few perfect or near-perfect scores. Your exam score in physics will be averaged with your exam score in chemistry. This averaged score will comprise 20% of your semester grade in ChemPhys.


Contents of Exam

There are ~70 multiple choice questions on the final exam and ~10 problems. The questions cover the following topics:


Approx. # of Qs

Newton's Laws and Their Applications:

  • Newton's first law - concept of inertia; relationship to mass
  • Newton's second law - factors affecting acceleration; meaning of net force; simple computations
  • Newton's third law - action-reaction; identifying force pairs in an interaction
  • Free-body diagrams and analysis - computing acceleration from known force values or determining an individual force value from a known acceleration
  • Combining a = Fnet/m with kinematics
  • Friction - static vs. kinetic; coefficient of friction; equation; determining Ffrict
  • Equilibrium - definition/concept; analyzing static situations (e.g., hanging signs)
  • Dynamic situations with forces at angles; SOH CAH TOA and a = Fnet/m
  • Inclined plane problems - resolution of force of gravity; conceptual understanding; computations; analyzing to determine the acceleration
  • Two-body problems - system analysis to determine acceleration; individual analysis to determine tension force or other forces

34 Qs

Circular Motion and Gravitation:

  • Uniform circular motion - conceptual understanding of vector quantities - v, a, and Fnet; importance of inertia in understanding the sensation of a centrifugal pull (careful); centripetal force
  • Simple computations of quantities such as v, a, Fnet, T, etc.
  • Mathematical analysis of physical situations involving motion in circles; use of a = Fnet/m and free-body diagrams to solve problems
  • Newton's law of universal gravitation - universal nature of gravity; conceptual understanding of the m-d-F relationships; simple computations
  • Satellite motion - variables effecting T, v, a, Fnet; role of gravity
  • Kepler's laws and their use to describe planets and other satellites
  • Weightlessness - conceptual understanding of the cause of this sensation

22 Qs

Static Electricity:

  • Charge interactions between like- and opposite-charges, etc.
  • Conductors vs. insulators
  • Methods of charging objects - friction, conduction (contact) and induction
  • Grounding
  • Polarization
  • Electric force and Coulomb's law calculations
  • Electric field - definition/concept, equation, units, simple computations
  • Electric field lines
  • Lightning rods and electric fields

22 Qs
Several of the questions require the use of a calculator; complex analysis are not common. Many quantitative questions are accompanied by a diagram - e.g., a free-body diagram - which forms the basis of the computation. When a calculation is involved, it is usually a straight-forward calculation (there are very few blue problems). Lots of questions can be answered quickly. Many questions are easy to very easy, others are of medium difficulty, few (if any) are complex, and none are impossible. The questions are much more general than what you would normally find on unit tests; small nuances are not the focus of the exam. Keep in mind that all questions are worth the same number of points. So do not blow 10 minutes trying to solve a two-body problem at the expense of other easier questions. If such a problem is that difficult for you, then count it as a loss and continue on with those questions which you do know. Return to the troublesome questions at the end of the test.

The following math equations will be provided on the test:

d = [(vi + vf) / 2] • t
d = vi • t + 0.5 • a • t2
vf = vi + a • t
vf2 = vi 2 + 2 • a • d
Fnet = m • a
Fgrav = m • g
Ffrict = mu • Fnorm
a = v2/R
Fgrav = G • M1 • M2 / d2
G = 6.67 • 10-11 N•m2/kg2
g = G • M / R2
v = SQRT (G • M / R)
T2/R3 = k
Felect = k • Q1 • Q2 / R2
k = 9.0 • 109 N•m2/C2
E = F / q
E = k • Q / R2
Qelectron = 1.6 • 10-19 C

How to Prepare

There are numerous ways to prepare for the test. The best ways are those which help you learn the material. This will be different for differnt learners with different learning styles. The main thing is to devote some time to the preparation process. There are numerous preparation tasks which can be done, all of which should help. The following provides some ideas:


Some absolute imperatives include:


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Last update: 12/18/2007