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PHYSICS 231 INTRODUCTORY PHYSICS I pa.msu/courses/phy231

PHYSICS 231 INTRODUCTORY PHYSICS I www.pa.msu.edu/courses/phy231. Scott Pratt prattsc@msu.edu (517) 355-9200, ext. 2016 Office Hours: T-R, immediately after class in 4208A BPS Tuesday: 1:00-2:30 PM in 1248 BPS. Strosacker Center, 1248 BPS Bldg. Homework.

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PHYSICS 231 INTRODUCTORY PHYSICS I pa.msu/courses/phy231

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  1. PHYSICS 231INTRODUCTORY PHYSICS Iwww.pa.msu.edu/courses/phy231 Scott Pratt prattsc@msu.edu (517) 355-9200, ext. 2016 Office Hours: T-R, immediately after class in 4208A BPSTuesday: 1:00-2:30 PM in 1248 BPS

  2. Strosacker Center, 1248 BPS Bldg. Homework • Monday 9:00 AM - noon, 12:30-6:00 PM • Tuesday 8:30 AM - 6:00 PM • Wednesday 8:30 AM - 10:00 AM • Graded electronically with LON-CAPA http://msu.loncapa.org • Due Wednesdays at 10:00 AM • No HW due week after Exam 1 and Exam 3

  3. EXAMS • 4 Midterms (on Thursdays during class time) • 1 Final • 11 questions one each midterm, graded on scale of 10 • Drop lowest of 4 midterms, no make-ups • 22 questions on final, graded on scale of 20 • Exams are closed book - closed note • Midterms will have HIGH overlap with homework • Midterms 2, 3 and 4 will include problem from previous midterm • Final will be made of reworded Midterm problems

  4. GRADES

  5. Textbook • Serway and Faughn • Old editions are fine

  6. Succeeding in Physics 231 • Do your homework! • Use the help room (1248 BPS) ! Stay away from ALLMSU • Make sure you understand both “why” and “why not” • Interrupt the lecturer

  7. General Physics • First Semester (Phy 231) • Mechanics • Thermodynamics • Simple harmonic motion • Waves Second Semester (Phy 232) • Electromagnetism • Relativity • Modern Physics • (Quantum Mechanics, …, etc.)

  8. Mechanics • Half the course • Quantified largely by Galileo • Problems involve:velocity, acceleration, mass, momentum, energy, torque, angular momentum, moment of inertia…

  9. UNITS (Systéme Internationale)

  10. Standard Kilogram at Sèvres

  11. Dimensional Analysis Dimensions & units can be treated algebraically.

  12. Dimensional Analysis Checking equations with dimensional analysis: (L/T2)T2=L L (L/T)T=L • Each term must have same dimension • Two variables can not be added if dimensions are different • Multiplying variables is always fine • Numbers (e.g. 1/2 or p) are dimensionless

  13. Example 1.1 Check the equation for dimensional consistency: Here, m is a mass, g is an acceleration,c is a velocity, h is a length

  14. Example 1.2 Consider the equation: Where m and M are masses, r is a radius andv is a velocity. What are the dimensions of G ? L3/(MT2)

  15. Units vs. Dimensions • Dimensions: L, T, M, L/T … • Units: m, mm, cm, kg, g, mg, s, hr, years … • When equation is all algebra: check dimensions • When numbers are inserted: check units • Units obey same rules as dimensions:Never add terms with different units • Angles are dimensionless but have units (degrees or radians) • In physics sin(Y) or cos(Y) never occur unless Y is dimensionless

  16. Example 1.3 Grandma traveled 27 minutes at 44 m/s. How many miles did Grandma travel? 44.3 miles

  17. Prefixes In addition to mks units, standard prefixes can be used, e.g., cm, mm, mm, nm

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