Lecture 7

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 ² 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 gt 2 ˆ (g = j) g Projectile Motion Diagram Projection Motion Diagram
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Quiz: A bullet is fired horizontally. At the same instant, the second bullet is dropped. Which strikes the ground first? The first bul e t The dro pped bule Th ey hit the ground . . N ot enough informati on 0% 0% 1. The first bullet 2. The dropped bullet 3. They hit the ground simultaneously. 4. Not enough information 12345 10 Independence of Components ± Discussion: Dropped/Shot Bullets ± Demo: Dropped/ Projected Balls ±
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This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

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

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