Lecture 4

Lecture 4 - Last Lecture Physics 231 General University...

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Physics 231 General University Physics Spring 2007 Lecture 4 Last Lecture ± One dimensional motion ² Position, displacement ² Average velocity, speed ² Instantaneous velocity ² Acceleration Today ± Constant accelaration ± Kinematic equations Kinematic Equations for Constant Acceleration 2 22 () 1 2 1 ( ) 2 2( ) xf xi x f i fi x i f i x f i x f x i f i x f i VVa tt X XV t t a XX VV t t VV a XX = +− =+ −+ + Kinematic Equations for Constant Acceleration (continued) 2 1 2 1 2 ) x x i f i x f i x f i t V t t a t VV t a + Often one simplifies with f i tt t =− “one-half a t-squared” formula Demo ± Galileo ± Wooden Blocks on Ramp
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Kinematic Equations ± The kinematic equations may be used to solve any problem involving one- dimensional motion with a constant acceleration ± You may need to use two of the equations to solve one problem ± Many times there is more than one way to solve a problem Kinematic Equations (specific) ± For constant acceleration, ± The average velocity can be expressed as the arithmetic mean of the initial and final velocities ± Not true if acceleration is not constant! VV V 2 x ix f x + = Kinematic Equations (specific) ± For constant acceleration, ± Can determine an object’s velocity at any time t when we know its initial velocity and its acceleration ± Does not give any information about displacement xf xi x at =+ Kinematic Equations (specific) ± For constant acceleration , ±
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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 4 - Last Lecture Physics 231 General University...

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