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Lect3-ch3_2 - L3Ch3 PHY 2053C College Physics A Fall 2004...

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1 Today: 1) Kinematics in two dimensions Motion, Forces, Energy, Heat, Waves Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle Today: Kinematics in two dimensions kinematical equations vectors projectile motion PHY 2053C – College Physics A Fall 2004 L3—Ch3 Position as a function of time with initial position x 0 and initial velocity v 0 . Initial means at t=0. Velocity as a function of time Velocity as a function of position Motion with Constant Acceleration x t x 0 v 0 t 1 2 at 2 v t v 0 a t v 2 t v 0 2 2 a x x 0 x t v t the “Kinematical equations”
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2 Free Fall Galileo observed three simple, but (in view of his peers) radical facts: 1) If you do nothing on an object (and eliminate friction), it keeps going indefinitely at a constant speed. 2) All objects fall at the same rate independent of their mass. 3) The distance fallen is proportional to the time squared, d ~ t 2 . Let's see, if he is right! Galileo Galilei, 1564-1642 Free Fall Galileo Galilei, 1564-1642 Free Fall is one-dimensional motion with a constant, negative acceleration. This means the
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