Physics 2211: Lecture 1 Notes

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Physics 2211 Classical Mechanics

• Mechanics How and why things move.
• Describing motion, how things move
  (KINEMATICS)
• What causes (changes to) motion or why things
  move? (DYNAMICS)
• Classical
• Not too fast (v ltlt c)
• Not too small (d gtgt atom)
• We start with translational motion where we
  assume all masses to be particles located at
  coordinates the center of mass of the object.
• Most everyday situations can be described in
  these terms.
• Path of baseball, Orbit of planets, motion of
  cars, airplanes, etc...

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Jan 11,2005Larry Sudduth E-101

• Agenda for Today
• Course Info and Syllabus
• rules and policies
• Required Materials
• textbook
• PRS
• mastering physics

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Required Materials

• Textbook and Web Homework Access Kit
• TEXT Physics for Scientists and Engineers (
  Knight)
• (Volume 1 only for this course)
• HOMEWORK Mastering Physics Student Access Kit
• (Bundled with New Textbooks)
• class id MPSUDDUTH0002
• Personal Response System (PRS) Transmitter
• - Buy from GT Bookstore for 30

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Course Information
http/www.physics.gatech.edu
Academics
Class Information
Fall 2004 Class Syllabi
PHYS 2211

• This is the official 2211 Web Page
• You are responsible for knowing the policies
• discussed on this page.
• Lets take a look!

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Some Words to the Wise

• 1. Read the textbook before the lecture
• Focus on new definitions, notation, vocabulary.
  Bring any questions you have to class.
• 2. Participate actively
• Come to lecture Ask questions Join a study
  groups Go to the Physics Help Sessions (N-209
  Howey Physics) Come see me, E-mail the TA
  (address to be announced) .
• 3. Keep up!

Manage your time wisely---work steadily every
day. Avoid the temptation to cram and put off
doing homework.
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WORDS TO THE WISE

• The universal dwells in the particular Keep
  looking for the big picture or what examples
  have in common rather than how they are
  different.
• Relax All of this is really easy.

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Coordinate Systems

• Before we can talk about out things move we need
  to decide how to concretely define where an
  object is.
• In 2-D, or 3-D there are two basic types of
  coordinate systems
• Cartesian coordinates (x,y,z) use units
• three mutually perpendicular directions.
• Conventions require right-handed system
• 2) Polar (or spherical) coordinates (r,q,f) use
  a distance and one or more angles

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Vectors

• Associated with each point is a vector from the
  origin of the coordinate system to the point
  referenced by the coordinates.

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Vectors

• All vectors have both magnitude and direction.
• Two vectors are equal if and only if they have
  the same magnitude and the same direction.
• Vectors are written as P or
• -P is a vector of the same magnitude as P but in
  the opposite direction.

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Coordinate Conversion

• To convert from rectangular to polar coordinates
  use
• and
• The convention is that the x-direction is
  direction 0 degrees and the q increases in the
  clockwise direction.
• To convert from polar to rectangular coordinates
  use
• Px rcos q and Py rsin(q)
• Learn to do this on your calculator

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Vector addition

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Vector Subtraction

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For Next Lecture (Wednesday)

• Register your transmitter
• Register for mastering physics
• Start reading Chapter 1 of textbook
• Mastering Physics HW 1 is due Thursday, 11PM