lecture24_1100_S12

lecture24_1100_S12 - PHYS 1100 Spring 2012 I. II. III....

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I. Constant Acceleration Problems in 2-D II. Problems with Non-constant Accerlation III. Graphical Kinematics A. Slope problems B. Area under the curve problems PHYS 1100 Spring 2012 Reading for Monday: 2.10
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EX0: Two cars approach each other on a straight stretch of highway. The first car is traveling East at a constant speed of 25 m/s and the second car is initially at rest and accelerates to the West at 3.2 m/s2. If the cars are initially 400 m apart, how long does it take for the cars to pass each other? At what point on the highway do the cars pass each other? PHYS 1100 Spring 2012 400 25 6 . 1 0 400 25 6 . 1 2 - = = = = - + c b a t t s 4 . 25 2 . 3 4 . 56 25 s 82 . 9 2 . 3 4 . 56 25 2 . 3 4 . 56 25 ) 6 . 1 ( 2 ) 400 )( 6 . 1 ( 4 25 25 2 4 2 1 2 2 - = - - = = + - = ± - = - - ± - = - ± - = t t a ac b b t
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EX1: Initially, an object is 25 m due west of the origin moving with a speed of 12 m/s in the direction 30° N of E. If the object undergoes a constant acceleration of 1.5 m/s2 in the direction 40° S of W for 10 seconds, what is the speed of the object after 10 s? Where is the object located after 10 s? PHYS 1100 Spring 2012
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CT1: Is the object slowing down or speeding up at 10 s? A. Slowing down B. Speeding up C. It cannot be determined PHYS 1100 Spring 2012
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EX3: An object that can move along the x axis is initially at the origin moving with a speed of 2.5 m/s in the positive x direction. The acceleration of the object is given by What are the position and velocity of the object after 5.0 s? PHYS 1100 Spring 2012 i t t a ˆ ) 0 . 3 0 . 6 ( ) ( - =
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Is the object slowing down or speeding up at 5 s? A.
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lecture24_1100_S12 - PHYS 1100 Spring 2012 I. II. III....

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