This preview shows pages 1–7. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Physics 211: Lecture 1, Pg 1 Physics 211: Physics 211: “Mechanics for Physicists and Engineers” “Mechanics for Physicists and Engineers” Agenda for Today Agenda for Today ● 1D Kinematics 1D Kinematics ● Average & instantaneous velocity and acceleration Motion with constant acceleration Original Author: Mats A. Selen Modified by W.Geist Physics 211: Lecture 1, Pg 2 Scope of Physics 211 Scope of Physics 211 ● Classical Mechanics: Classical Mechanics: Mechanics: Mechanics: How and why things work Classical: Classical: » Not too fast (v << c) relativity (325) » Not too small (d >> atom) quantum mechanics (214, etc) ● Most everyday situations can be described in these classical terms. Most everyday situations can be described in these classical terms. Path of baseball Orbit of planets etc... Physics 211: Lecture 1, Pg 3 ● How we measure things! ● All things in classical mechanics can be expressed in terms of the fundamental units: fundamental units: Length L Mass M Time T ● For example: Speed has units of L / T (i.e. miles per hour). Force has units of ML / T 2 etc... (as you will learn). Fundamental Units Fundamental Units Physics 211: Lecture 1, Pg 4 Units... Units... ● SI (Système International) Units: SI (Système International) Units: mks : L = meters (m), M = kilograms (kg), T = seconds (s) cgs: L = centimeters (cm), M = grams (gm), T = seconds (s) ● British Units: British Units: Inches, feet, miles, pounds, slugs... ● We will use mostly SI units, but you may run across some problems using British units. You should know how to convert back & forth. Physics 211: Lecture 1, Pg 5 Converting between different systems of units Converting between different systems of units ● Useful Conversion factors: 1 inch = 2.54 cm 1 m = 3.28 ft 1 mile = 5280 ft 1 mile = 1.61 km ● Example: convert miles per hour to meters per second: s m 447 s hr 3600 1 ft m 28 3 1 mi ft 5280 hr mi 1 hr mi 1 . . = × × × = Physics 211: Lecture 1, Pg 6 ● This is a very important tool to check your work It’s also very easy! ● Example: Example: Doing a problem you get the answer distance d = vt 2 (velocity x time 2 ) Units on left side = L Units on right side = L / T x T 2 = L x T ● Left units and right units don’t match, so answer must be Left units and right units don’t match, so answer must be wrong!!...
View
Full
Document
This note was uploaded on 12/05/2009 for the course PHYSICS PHYS taught by Professor Phys during the Spring '09 term at Abu Dhabi University.
 Spring '09
 PHYS
 Acceleration

Click to edit the document details