lecture_16 - Spring 2014 PHYS 2010 Lecture 16 PHYS 2010 1...

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Spring’2014’ PHYS-2010’ Lecture’16’ 2/19/2014’ PHYS-2010’ 1’
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The’driver’of’a’car’parked’ on’a’hill’releases’the’brake’ and’puts’the’car’in’neutral’ Let’ ’=’normal’force’ ’=’force’of’gravity’ =’acceleraEon’of’the’car.’ Which’of’the’following’is’true?’ N  F g a A ) A = a , E = N , B = F g B E = N , D = a , C = F g C E = N , D = F g , C = a D A = a , B = F g , E = N Clicker’Ques;on’ Room’Frequency’BA’ 2/19/2014’ PHYS-2010’ 2’
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Read’ Giancoli’Chapter’4.’ CAPA’#’6’ is’now’printed’and’in’the’CAPA’dispensary:’ due’next’Tuesday’at’11’pm.’ [email protected]’homework’#’4’ due’Friday’at’4’pm.’ Two’more’ Study’Sessions’ by’Prof.’Pollock will’be’held’on’ the’next’two’Tuesdays’ in’G125,’5-6’pm.’ Announcements’ 2/19/2014’ 3’ PHYS-2010’
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+’ x F f c m Two’boxes’with’masses’ M ’and’ m ’are’glued’together.’ Force’ F ’is’applied’to’Box’1’(with’mass’ M ).’ Force’ f c ’is’the’“contact’force”’that’Box’1’exerts’on’Box’2.’ Box’1’ Box’2’ A)’F’=’f c B)’F’>’f c’ C)’F’<’f c D)’Indeterminate’from’informaEon’given’ M *’FricEonless’surface’ 2/19/2014’ PHYS-2010’ 4’
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M m’ +x’ F f c m Box’1’ Box’2’ Draw’the’free-body’diagram’for’each’box!’ M m F f c’ What’other’forces’are’acEng’on’either’box?’ GravitaEonal’force’down’on’both’boxes,’and’ Normal’force’up’on’both’boxes.’ However,’since’there’is’no’verEcal’moEon’ we’someEmes’do’not’bother’to’write’them’down.’ What about Newton’s Third Law?
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lecture_16 - Spring 2014 PHYS 2010 Lecture 16 PHYS 2010 1...

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