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Unformatted text preview: P H Y 1 1 : H o w t h e w o r l d w o r k s I T o r t o i s e a n d t h e h a r e : O n e d i m e n s i o n a l m o t i o n http://www.cartoonstock.com/lowres/pha0147l.jpg D e s c r i b i n g a n o b j e c t What is the position, r , of the center of mass of an object? x y Origin r D i s p l a c e m e n t V e c t o r The displacement vector is the change of the position vector, or d = r f r i , where r f is the final position and r i is the initial position. The magnitude of the displacement vector is not necessarily equal to the distance travelled. V e l o c i t y The average velocity, v av , is defined as v av = r f r i t f t i , where t f is the final time and t i is the initial time. The instantaneous velocity, v , is defined as v = lim t r t , where r is the displacement during a very short time interval t . A c c e l e r a t i o n The average acceleration, a av , is defined as a av = v f v i t f t f . The instantaneous acceleration, a , is defined as a = lim t v t , where v is the change in velocity during a very short time interval t ....
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 Fall '08
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