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# Lecture2 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 2...

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PHYSICS 231 INTRODUCTORY PHYSI CS I Lecture 2

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Lecturer: Carl Schmidt (Sec. 001) [email protected] (517) 355-9200, ext. 2128 Office Hours: Friday 1-2:30 pm in 1248 BPS or by appointment PHYSICS 231 INTRODUCTORY PHYSICS I
Main points of last lecture SI units: Mass: kilograms (kg) Length: meters (m) Time: seconds (s) Unit conversion Dimensional analysis / Unit consistency Scientific Notation and Significant figures Displacement: x = x f -x i Average Velocity: v = D x D t

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Graphical Representation of Average Velocity Between A and D , v is slope of blue line v = 40m 3.0s =13.3m/s

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basicformula v = ξ τ = ξ φ - ξ ι τ Instantaneous velocity Let time interval approach zero Defined for every instance in time Equals average 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

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Graphical Representation of Instantaneous Velocity x t v = lim D t 0 D x D t = Slope of tangent at that point
Graphical Representation of Instantaneous Velocity v(t=3.0) is slope of tangent (green line)

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Example 2.2a The instantaneous velocity is zero 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

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Example 2.2c The average velocity is zero in the interval _____ A) a-c B) b-d C) c-d D) c-e E) d-e
Example 2.2d The average velocity is negative in the interval(s) _________ A) a-b B) a-c C) c-e D) d-e

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SPEED Speed is | v| and is always positive Average speed is sum over | x| elements divided by elapsed time
Example 2.3 2 4 6 8 2 4 6 8 10 12 0 0 A B C D E a) What is the average velocity between B and E? b) What is the average speed between B and E?

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