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Lecture_5 - PHYS 218 General Physics Fall 2012&5'A5B#C...

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Fall 2012 PHYS 218: General Physics !"#$%&" () *+,-$"& ./(0 ./10 ./20 ./3 45&#"6 ,78 95:57 ;7 <7" =;>"76;57 ?&[email protected]/ A5B:#C ?+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 [email protected] $+" 5MN"#$ ;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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Friction 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 is called the coefficient of kinetic friction A pure number with no units Q"#:57 ./.
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Static Friction In many situations, the relevant surfaces are not slipping (moving) with respect to each other This situation involves static friction The amount of the push can vary without the object moving Q"#:57 ./.
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Static Friction, cont.
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