Download presentation
Presentation is loading. Please wait.
1
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
2
Strosacker Center, 1248 BPS Bldg. 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 Homework
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 4 Midterms60%Feb. 5, Mar. 4, Apr. 1, Apr. 29 During class in 1410 BPS (right here) Lowest score dropped No makeups 11 questions, graded on scale of 10 Questions largely from homework Final Exam30%May 4, 5:45-7:45 PM, location TBA 22 questions, graded on scale of 20 Reworded Midterm problems Homework10%LON-CAPA, www.loncapa.org Log-in with pilot ID & password
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) DimensionSI (mks) UnitDefinition Lengthmeters (m)Distance traveled by light in 1/(299,792,458) s Masskilogram (kg)Mass of a specific platinum- iridium allow cylinder kept by Intl. Bureau of Weights and Measures at Sèvres, France Timeseconds (s)9,192,631,700 oscillations of cesium atom
10
Standard Kilogram at Sèvres
11
Dimensional Analysis Dimensions & units can be treated algebraically. Variable from Eq.xmtv=(x f -x i )/ta=(v f -v i )/t dimensionLMTL/TL/T 2
12
Dimensional Analysis Checking equations with dimensional analysis: L (L/T)T=L (L/T 2 )T 2 =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 ) 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 L 3 /(MT 2 ) Consider the equation: Where m and M are masses, r is a radius and v is a velocity. What are the dimensions of G ?
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, m, nm
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.