Lecture_5 - PHYS 218: General Physics Fall 2012...

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Fall 2012 PHYS 218: General Physics 45"6 ,78 95:57 ;7 <7" =;>"76;57 ?+D6;#6 E>/ FF( 9G H).IJFI)KI
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Newton ! s Third Law Consequences [ a ] ! F friction = ! F push [ b ] ! F friction = ! F push [ c ] ! N = ! F push [ d ] ! N = ! F gravity L@ $+" 5MN"#$ ;6 >5O;7P ,$ , #576$,7$ 6-""8 $+"7
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Newton ! s Third Law Consequences • Forces ALWAYS come in pairs • The two forces are ALWAYS equal in magnitude and opposite in direction • The forces act on different objects – Person exerts a force on the refrigerator – The refrigerator exerts a force on the person Q"#:57 K/(
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Constant Acceleration Equations, Summary Q"#:57 ./F
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Adding Friction • Friction is another force commonly encountered in problems • Friction can be – Kinetic • Related to moving – Static • When objects are at rest Q"#:57 ./.
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The force of friction opposes the motion The magnitude of the frictional force is related to the magnitude of the normal force Force of kinetic friction – F friction = ! k N ! k
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This note was uploaded on 02/05/2012 for the course PHYS 218 taught by Professor A during the Spring '08 term at Purdue University-West Lafayette.

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Lecture_5 - PHYS 218: General Physics Fall 2012...

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