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Lecture 7 - Today Physics 231 General University Physics...

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Physics 231 General University Physics Spring 2007 Lecture 7 Today Motions in Two Dimensions More Projectile Motion Circular Motion Tangential and Radial Acceleration Relative Motion postponed to dynamics Acceleration from Change in Velocity Equations for Projectile Motion Consider the motion as the superposition of the motions in the x - and y -directions The x -direction has constant velocity a x = 0 The y-direction is free fall a y = - g The actual position at any time is given by: r f = r i + v i t + ½ g t 2 x f = v xi t = ( v i cos θ ) t y f = v yi t + ½ a y t 2 = ( v i sin θ ) t - ½ gt 2 ˆ (g = j) g Projectile Motion Diagram Projection Motion Diagram
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