ChemPhys 273 - Semester Review

Second Semester, 2013-2014

  

Background Information

The physics exam for ChemPhys 273 will be held during the 50-minute class period on Tuesday, June 3. The exam will be a 50-minute exam covering all topics learned during the second semester and perhaps a few other concepts which were learned during the other three semesters of the course but have relevance to second semester topics (e.g., kinematic equations, acceleration, Newton's laws, etc.). The exam will be started the moment you enter the room and will be collected at the end of the 50-minute period. In addition to the 50 minutes exam, there will be an additional 15-minute portion of the exam that will include two reading passages. Extra time will not be alloted on these exams. If there are special circumstances that require that you are permitted additional time, then see Mr. Henderson privately before the day of the exam to discuss those circumstances and to make arrangments.

Most of the approximately 60 questions are multiple-choice. There are approximately 8 short computational questions which are not multiple choice; credit is only given for the correct answer with the unit. All questions are worth the same amount of points. 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. 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 a little less than 60 multiple choice and short computational questions on the final exam. The questions cover the following topics:

Topics

Approx. # of Qs

Kinematics, Newton's Laws Applications, and Static Electricity:

  • Using kinematic equations to calculate how far, how fast, or how much time would be associated with a given 1-dimensional motion.
  • Acceleration - the rate of change of velocity.
  • 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
  • Applications of Newton's laws to circular motion; direction of v, a, and F; centripetal force and inertia; Fnet = m•a problems
  • 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

8 Qs

Work and Energy:

  • Work - definition, equation, units, simple computations
  • Power - definition, equation, units, simple computations
  • Potential energy - definition, equation, units, simple computations
  • Kinetic energy - definition, equation, units, simple computations
  • Work-energy relationship; conservative vs. non-conservative forces; work-energy equation and its use in solving problems
  • Work-energy bar charts
  • Conservation of energy - equation

18 Qs

Momentum Conservation and Collisions:

  • Momentum - definition, equation, units, simple computations
  • Impulse - definition, equation, units, simple computations; relationship to momentum change
  • Newton's third law - relationship to collisions
  • Momentum conservation; isolated systems; use of p conservation in analysis of collisions
  • Elastic collisions vs. inelastic collisions; criteria for each; mathematical analysis
  • Two-dimensional collisions; vector/mathematical analysis

17 Qs

Electric Circuits:

  • Electric potential - definition, equation, units, simple computations; relationship to potential energy and to current, resistance, power, etc.
  • Two requirements for a circuit
  • Current - definition, equation, units, simple computations; relationship to voltage, resistance, power, etc.
  • Resistance - definition, equation, units, simple computations; variables effecting the amount of resistance in a wire; relationship to voltage, current, power, etc.
  • Power - definition, equation, units, simple computations; relationship to energy, voltage, resistance, current, etc.
  • Energy - power - cost calculations
  • Series circuits - diagrams; definitions; equivalent resistance; rules regarding current and voltage for entire circuit and for individual resistors
  • Parallel circuits - diagrams; definitions; equivalent resistance; rules regarding current and voltage for entire circuit and for individual resistors

15 Qs

Several of the questions require the use of a calculator; complex analysis are uncommon (if present at all). Many quantitative questions are accompanied by a diagram - e.g., a pre- and post-collision diagram or a circuit diagram - which forms the basis of the computation. When a calculation is involved, it is usually a straight-forward calculation (there are only a few blue problems). Lots of questions can be answered quickly. Many questions are easy to very easy, others are of medium difficulty, few 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 an elastic collision 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
Ffrict = mu • Fnorm
SOH CAH TOA
PE = m • g • h
KE = 0.5 • m • v2
W = F • d • cos(Theta)
P = W / t
KEi + PEi + Wnc = KEf + PEf
F • t = m • (Delta v)
p = m • v
I = Q / t
V = (Delta PE) / Q
Qelectron = 1.6 • 10-19 C
P = I • V = (Delta E) / t
Req = Ra + Rb + Rc + ...
1/Req=1/ Ra +1/ Rb+1/ Rc + ...
V = I • R

 

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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