Lec7_S10

# Lec7_S10 - T o d a y A p p l y i n g N e w t o n ’ s L a...

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Unformatted text preview: T o d a y : A p p l y i n g N e w t o n ’ s L a w s . N e w s i t u a t i o n s- t h e s a m e p h y s i c a l p r i n c i p l e s . I n c l i n e d p l a n e . S h o p p i n g f o r p e r f e c t b a s k e t b a l l s h o e s : P h y s 2 A a p p r o a c h P u l l e y s . A t w o o d ’ s M a c h i n e . P h y s i c s 2 A O l g a D u d k o U C S D P h y s i c s L e c t u r e 7 M u l t i p l e O b j e c t s E x a m p l e • T w o b l o c k s a r e i n c o n t a c t o n a f r i c t i o n l e s s t a b l e . Y o u a p p l y a h o r i z o n t a l f o r c e t o t h e l a r g e r b l o c k . I f m 1 = 2 . 3 k g , m 2 = 1 . 2 k g , a n d F a p p l i e d = 3 . 2 N , f n d t h e m a g n i t u d e o f t h e f o r c e b e t w e e n t h e t w o b l o c k s . S o l u t i o n • F i r s t , d e f n e a c o o r d i n a t e s y s t e m . • C h o o s i n g u p a s + y a n d t h e d i r e c t i o n o f t h e a p p l i e d f o r c e a s + x . m 2 m 1 F a p p l i e d M u l t i p l e O b j e c t s S o l u t i o n ( c o n t S o l u t i o n ( c o n t ’ ’ d ) d ) • D r a w a f o r c e d i a g r a m f o r e a c h b l o c k s e p a r a t e l y : • N o n e e d t o b r e a k t h e f o r c e s i n t o c o m p o n e n t s . m 1 F n o r m a l , t a b l e o n m 1 F g r a v i t y , E a r t h o n m 1 F c o n t a c t , m 2 o n m 1 F a p p l i e d , y o u o n m 1 m 2 F n o r m a l , t a b l e o n m 2 F g r a v i t y , E a r t h o n m 2 F c o n t a c t , m 1 o n m 2 m 2 m 1 F a p p l i e d • A p p l y N e w t o n ’ s 2 n d L a w s e p a r a t e l y t o e a c h o b j e c t ....
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## This note was uploaded on 04/20/2010 for the course PHYS 2A 2 taught by Professor Sharma during the Spring '09 term at UCSD.

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Lec7_S10 - T o d a y A p p l y i n g N e w t o n ’ s L a...

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