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

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Unformatted text preview: PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 2 • 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: Δ x = x f-x i • Average Velocity: v = " x " t Graphical Representation of Average Velocity Between A and D , v is slope of blue line v = 40m 3.0s = 13.3m/s basicformula v = ! x ! t = x f " x i t 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 Graphical Representation of Instantaneous Velocity Δ x Δ t v = lim " t # " x " t = Slope of tangent at that point Graphical Representation of Instantaneous Velocity v(t=3.0) is slope of tangent (green line) 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 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 SPEED • Speed is |v| and is always positive • Average speed is sum over | Δ 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 average velocity between B and E?...
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Lecture2 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 2 •...

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