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Unformatted text preview: Projectile Motion, Circular Motion, Relative Motion PHYS116A02, 9/7/10, Lecture 4 Momchil Velkovsky Acceleration 0% 0% 0% 0% 0% What is the direction of the rover’s average acceleration vector for the time interval from t = 0.0 s to t = 2.0 s? A. up and to the left B. up and to the right C. down and to the left D. down and to the right E. none of the above Acceleration of the rover Our rover again v x = – (0.5 m/s 2 )t v y =(1.0 m/s) + (0.075 m/ s 3 )t 2 We can find a x and a y independently! Acceleration: a x = – 0.5 m/s2 a y =2*(0.075 m/s3)t ˆ ˆ ˆ ˆ ( ) ( ) ( ) 0.5 0.15 x y a t a t i a t j i t j = + =  + r Parallel and Perpendicular components of acceleration 0% 0% 0% 0% 0% The motion diagram shows an object moving along a curved path at constant speed. At which of the points does the object have zero acceleration? A. point A only B. point C only C. point E only D. points A and C only E. points A, C, and E A ball is tied to a post by a thread and moves in a circle. At point P the thread breaks. What is the approximate trajectory of the ball afterwards?...
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 Fall '09
 Velkovsky
 Physics, Acceleration, Circular Motion, Projectile Motion, Relative Motion, Velocity, Average Ground speed, average acceleration vector

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