Lecture2 - PH YSI CS 231 I N TRODUCTORY PH YSI CS I Lectur...

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Unformatted text preview: PH YSI CS 231 I N TRODUCTORY PH YSI CS I Lectur e 2 Lecturer: Carl Schmidt (Sec. 001) schmidt@pa.msu.edu (517) 355-9200, ext. 2128 Office Hours: Friday 1-2:30 pm in 1248 BPS or by appointment PH YSI CS 231 I N TRODUCTORY PH YSI CS I Main points of last lecture SI units: Mass: kilogr ams (kg) Length: meter s (m) Time: seconds (s) Unit conver sion Dimensional analysis / Unit consistency Scientific N otation and Significant figur es Displacement: x = x f-x i Aver age Velocity: v = D x D t Graphical Representation of Average Velocity Between A and D , v is slope of blue line v = 40m 3.0s =13.3m/s basic formula v = = - Instantaneous velocity Let time inter val appr oach zer o Defined for ever y instance in time Equals aver age velocity if v = constant SPEED is absolute value of velocity Graphical Representation of Average Velocity Between A and D , v is slope of blue line Graphical Representation of Instantaneous Velocity x t v = lim D t D x D t = Slope of tangent at that point Graphical Representation of Instantaneous Velocity v(t=3.0) is slope of tangent (gr een line) Example 2.2a The instantaneous velocity is zer o at ___ A) a B) b & d C) c & e Example 2.2b The instantaneous velocity is negative at _____ A) a B) b C) c D) d E) e Example 2.2c The aver age velocity is zer o in the inter val _____ A) a-c B) b-d C) c-d D) c-e E) d-e Example 2.2d The aver age velocity is negative in the inter val(s) _________ A) a-b B) a-c C) c-e D) d-e SPEED Speed is | v| and is always positive Aver age speed is sum over | x| elements divided by elapsed time Example 2.3 2 4 6 8 2 4 6 8 10 12 A B C D E a) What is the aver age velocity between B and E?...
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This note was uploaded on 07/25/2008 for the course PHY 231 taught by Professor Smith during the Spring '08 term at Michigan State University.

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Lecture2 - PH YSI CS 231 I N TRODUCTORY PH YSI CS I Lectur...

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