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Unformatted text preview: 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 and initial velocity v . Initial means at t=0. Velocity as a function of time Velocity as a function of position Motion with Constant Acceleration x t x v t 1 2 at 2 v t v a t v 2 t v 2 2 a x x x t v t the “Kinematical equations” 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!...
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