ChemPhys 273  Semester
Review
First Semester, 20072008
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 90minute 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 90minute 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 multiplechoice (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 nearperfect 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:
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  actionreaction; identifying
force pairs in an interaction
 Freebody diagrams and analysis  computing
acceleration from known force values or determining an
individual force value from a known acceleration
 Combining a = F_{net}/m with kinematics
 Friction  static vs. kinetic; coefficient of
friction; equation; determining F_{frict}
 Equilibrium  definition/concept; analyzing static
situations (e.g., hanging signs)
 Dynamic situations with forces at angles; SOH CAH TOA
and a = F_{net}/m
 Inclined plane problems  resolution of force of
gravity; conceptual understanding; computations;
analyzing to determine the acceleration
 Twobody 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 F_{net}; importance
of inertia in understanding the sensation of a
centrifugal pull (careful); centripetal force
 Simple computations of quantities such as v, a,
F_{net}, T, etc.
 Mathematical analysis of physical situations
involving motion in circles; use of a = F_{net}/m
and freebody diagrams to solve problems
 Newton's law of universal gravitation  universal
nature of gravity; conceptual understanding of the mdF
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
oppositecharges, 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 freebody diagram  which forms the basis of
the computation. When a calculation is involved, it is usually a
straightforward 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 twobody 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 = [(v_{i} + v_{f}) / 2]
• t

d = v_{i} • t + 0.5 • a •
t^{2}

v_{f} = v_{i} + a • t

v_{f}^{2} = v_{i
}^{2} + 2 • a • d

F_{net} = m • a

F_{grav} = m • g

F_{frict} = mu •
F_{norm}

SOH CAH TOA

a = v^{2}/R

F_{grav} = G • M_{1} •
M_{2} / d^{2}

G = 6.67 • 10^{11}
N•m^{2}/kg^{2}

g = G • M / R^{2}

v = SQRT (G • M / R)

T^{2}/R^{3} = k

F_{elect} = k • Q_{1} •
Q_{2} / R^{2}

k = 9.0 • 10^{9}
N•m^{2}/C^{2}

E = F / q

E = k • Q / R^{2}

Q_{electron} = 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:
 Use the Unit Review sheets from The
Review Session for each of the four units which we have
completed.
 Review old quizzes (but do note that there are many topics on
the final which were not on quizzes).
 Use The Physics
Classroom or the Multimedia
Physics Studios to review topics which you have difficulty
with or merely need to review.
 Utilize Minds On Physics
to help prepare. Try any module you wish; there is no need to
submit codes to the database.
 Review concept sheets from the packet and sample problems done
in class.
 Review sections of your book and use the Reading Sheets from
the packet to assist in your review.
 Review the major types of calculations that are performed with
the equations listed above.
 Never underestimate the power of a good nights sleep on the
evening before an exam. This may mean that you will have begin
preparations several days in advance.
Some absolute imperatives include:
 Know what each symbol in the given equations stand for;
questions about what a symbol means or represents will not be
answered on the test.
 Have a strong idea of what each type of problem might look or
sound like and of how to analyze it. When the problem appear, you
will need to have an instant understanding of how to approach the
problem and of what equations to use. (For instance, you ought to
know what a twobody problem looks or sounds like; and you ought
to know that there are always two questions which are asked; and
finally, you ought to be familiar with the problem solving
approach. When it shows up, you can quickly procede with your
strategy to answer the two questions.)
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Last update: 12/18/2007