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lecture22_1100_S12

# lecture22_1100_S12 - PHYS 1100 Spring 2012 I II...

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I. Instantaneous Variables A. Position B. Velocity C. Acceleration II. Constant Acceleration Problems PHYS 1100 Spring 2012 Reading for Wednesday: 2.7 – 2.8

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GW1: PHYS 1100 Spring 2012 The position of an object in the xy-plane is given in m by: What is the average velocity of the object in unit vecotr notation between the time it travels fastest in the x direction and the time it turns around in the y direction? j t t i t t t r ˆ ) 1 8 2 ( ˆ ) 4 6 3 ( 2 2 3 - - + + + - =
PHYS 1100 Spring 2012 x a v v t a t v x t x t a v t v x x x x x x x x + = + + = + = 2 2 1 ) ( ) ( 2 , 0 2 2 , 0 0 , 0 y a v v t a t v y t y t a v t v y y y y y y y y + = + + = + = 2 2 1 ) ( ) ( 2 , 0 2 2 , 0 0 , 0 z a v v t a t v z t z t a v t v z z z z z z z z + = + + = + = 2 2 1 ) ( ) ( 2 , 0 2 2 , 0 0 , 0 In x : In y : In z : v ( t ) = v 0 + at x ( t ) = x 0 + v 0 t + 1 2 at 2 v 2 = v 0 2 + 2 a ×∆ x For Constant Acceleration:

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Question #1: What do I know? Working a kinematics problem Question #2: Is the acceleration of the object zero? Question #3: Is the acceleration constant?
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lecture22_1100_S12 - PHYS 1100 Spring 2012 I II...

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