Lect01(Measurement and Vectors)

Lect01(Measurement and Vectors) - Physics 211: Lecture 1,...

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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 ● 1-D Kinematics 1-D 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!!...
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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.

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Lect01(Measurement and Vectors) - Physics 211: Lecture 1,...

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