PowerPoint - Matter & Interactions

Edition of
Matter & Interactions
Ruth Chabay
Bruce Sherwood
Department of Physics
North Carolina State University
Wiley Workshop, AAPT winter meeting, San Diego, 2015-01-04
Matter & Interactions 4e
R. Chabay & B. Sherwood
John Wiley & Sons
Contemporary introductory calculus-based physics course for
engineers and scientists
Current users include:
• Large institutions: Purdue, Georgia Tech, NC State, U of Texas
Austin, Cal State Long Beach, Carnegie Mellon; others with honors
• Four-year colleges, including Carleton, Wellesley, Haverford,
Union, St. Olaf, and others.
• Some community colleges, a few high schools
• Outside the U.S.: University of Calgary (Canada), Monterrey Tec
(Mexico), Chalmers University (Sweden), University of Cape Town,
Australian National University, Macquarie University (Australia),
University of Helsinki;
• Spanish version (3e) in press (Trillas, Mexico)
20th century: Flood of new information
Atoms have massive nuclei. Electrons surround nuclei.
Specific heat capacity varies with T at low temperature
Energy is quantized
Mass is energy
Superconductors have zero resistance
Particles are waves.
Waves are particles.
Everything is fields.
p+, p-, p0, m+, m-, D+, D++, t, K, W, n...
Time runs differently in moving frames
How did physicists cope with
this information influx?
• Parsimony and unification
• Small number of fundamental principles
(Conservation laws)
• Small number of fundamental interactions
(electromagnetic, strong, weak,
• Small number of kinds of particles
(quarks and leptons)
What might a contemporary
intro physics course look like?
• Emphasize a small number of
fundamental principles instead of a
large number of derived formulas
• Integrate the atomic nature of matter
from the start
• Engage students in making models of
physical phenomena, based on
fundamental principles (computation is
an essential component)
Modern Mechanics
• The Momentum Principle
• The Energy Principle
• The Angular Momentum Principle
• Randomness and Entropy
Matter in Mechanics
• The Momentum Principle
• springs; gravitating masses; protons, electrons, neutrons; four
fundamental interactions
• ball-spring model; Young’s modulus; speed of sound in a solid;
introduction to friction; gases; Tarzan and the vine
• discovery of the nucleus
• The Energy Principle
nuclei (mass, fission, fusion)
heat capacity; internal energy; dissipation
electronic energy levels; diatomic molecules
energetics of extended systems; details of friction
• The Angular Momentum Principle
• Bohr model; particle spin
• Randomness and Entropy
• Einstein model of a solid; constant-temperature atmosphere;
speed distribution in a gas; specific heat of diatomic molecules
Electric & Magnetic Interactions
• Stationary charges
• Electric field; superposition
• Moving charges
• Electron and conventional current; magnetic field
• Magnetic force
• Charge and field in circuits
• Patterns of field in space
• Gauss’s law and Ampere’s law
• Time-varying charge motion
• Faraday’s law
• Maxwell’s equations; electromagnetic radiation
Matter in E&M
• Electric field
• Electron mobility
• Polarization of conductors and insulators
• Circuits
• Drude model; electron current; surface charge
• Magnetic field and magnetic force
• atomic models of ferromagnetism
• Hall effect; motional emf
• Electromagnetic radiation
• effect of electromagnetic radiation on matter; reradiation; index of refraction
It’s too hard…
• Not for students.
• But it is unfamiliar to first-time
instructors, especially those who have
taught the traditional approach for some
It’s too easy…
What About Coverage?
• If you start from fundamental principles:
• “Special cases” are not special
• Topics traditionally seen as unrelated are
• Students can analyze novel phenomena
that aren’t explicitly taught
What’s new in the 4th edition?
General issues
More problems
More WebAssign problems
More computational problems
Improved indication of problem difficulty
Cleaner page layout
Answers to odd-number problems
Student solution manual (Aaron Titus and Joe
Heafner) – a selection of odd-numbered
problem solutions
• Updated, extensive instructor resources
The Momentum Principle
• A new approach to the Momentum Principle
Now and Future: Curving motion (Ch 5)
4e Support for
Computational Modeling
Iterative calculations done by hand (a few steps)
Translation of algebra to VPython code
Focus on key program elements
Labs rewritten to coordinate with text
• Emphasis on reading, modifying code
• New VPython videos on lists
• Extended Instructor Guide to Computation
• Recurring comparisons of analytical and iterative
solution approaches
• Many additional computational problems, small and
Translation of algebra to
VPython code
Focus on key program elements
Focus on key program elements
Many additional computational problems,
small and large
Point Particle vs.
Extended System
• Ongoing discussion of the relationship
between modeling a system as a point
particle or as an extended system
Other changes, by chapter
• We will highlight significant changes in
specific chapters. In addition, in many
chapters there is an improved sequencing of
• Ch. 5: more instruction on multiobject
systems; improved analysis of curving
motion; dot product introduced to calculate
parallel and perpendicular components of
momentum, including computationally
• Ch. 6: improved discussion of path
independence, including the fact that it is
valid only for objects that can be modeled as
point particles
• Ch. 7: choice of reference frame affects terms
in the Energy Principle
• Ch. 8: randomness of emission; lifetime of an
excited state
• Ch. 9: improved analysis of point particle and
extended system models
• Ch. 11: more extensive treatment of rotational
kinematics, with new homework problems
• What was Ch. 13 on gases will be moved to
the Wiley student site as Supplement S1
• Ch. 14 (effects of electric field on matter): we
show in detail the computed distribution of
surface charge on a polarized metal block in
• Ch. 15 (fields of distributed charges): explicit
instruction on Python lists, for sets of source
charges and for sets of observation locations
• Ch. 18 (circuits in terms of charge and field):
we show in detail the computed distribution of
surface charge on various quasi-DC circuits
Click here for surface charge demo
• Ch. 16 (electric potential): instruction on how
to calculate potential difference
• Ch. 20 (magnetic force): corrected analysis of
motional emf in the case of a bar moving
along rails; updated “Jack and Jill” to “Alice
and Bob”
• Ch. 21 (patterns of fields in space): optional
section on PN junctions will be moved to the
Wiley student site as Supplement S2
The chapter on waves will be available on the
Wiley student site as Supplement S3, with a new
section on the wave equation and longitudinal and
transverse mechanical waves, with micro and
macro analyses
Matter & Interactions 4e
R. Chabay & B. Sherwood
John Wiley & Sons

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