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Unformatted text preview: 1 PHYS 101  Lecture 3 1 SUMMARY of last lecture: simplify motion: point masses, no forces acting relevant quantities are distance/displacement speed/velocity acceleration graphically: displacement velocity acceleration slope slope area under curve area under curve Physics 101 – Lecture 3 Onedimensional kinematics (con’t) PHYS 101  Lecture 3 2 v = v + at v aver = (v + v )/2 v 2 = v 2 + 2a (x – x ) x = x + v t + ½at 2 Equations for constant acceleration : TODAY:  some examples of 1D motion objects in freefall: constant acceleration motion primer on vectors to prepare us for 2D motion 2 PHYS 101  Lecture 3 3 Useful collection of simple kinematics applets at: vnatsci.ltu.edu/s_schneider/physlets/main/index.shtml In particular: vnatsci.ltu.edu/s_schneider/physlets/main/kinem01.shtml PHYS 101  Lecture 3 4 Example Giancoli problem: 2.63: 95m long train at constant acceleration starts from rest. Front of train has speed of 25 m/s when it passes a man standing 180 m from the place it started. What is speed of last car as it passes man? Before we start, an aside about problem solving: it’s NOT a random procedure, casting about for an equation! structured approach is best I advocate a fourstep procedure:  Sketch … sketch what’s known & given, with coords and symbols Spell out … list the givens & the unknowns Solve … find the right equation(s), solve Sanity check … make sure units, order of magnitudes, etc… are correct 3 PHYS 101  Lecture 3 5 Example Giancoli problem: 2.63: 95m long train at constant acceleration starts from rest. Front of train has speed of 25 m/s when it passes a man standing 180 m from the place it started. speed of 25 m/s when it passes a man standing 180 m from the place it started....
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This note was uploaded on 09/29/2011 for the course PHYS 101 taught by Professor Prof during the Fall '08 term at McGill.
 Fall '08
 prof
 Physics, mechanics, Acceleration, Force, Mass

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