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L9(1) - General Physics 1 Announcements Midterm 1 grades...

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General’Physics’1’
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Announcements’ Midterm’1’grades’posted’on’Blackboard,’ along’with’example’solu>ons’ Lowest’midterm’score’will’be’dropped ’ ’ Places’to’get’help:’office’hours,’Learning’Den,’ PILOT’ Homework’4’due’Thursday’10’pm’(online),’ with’wriKen’version’due’Friday’in’sec>on’ ’’ No’wriKen’version’is’needed’for’problem’4’
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Midterm’exam’scores’(percentages)’ Mean’for’Midterm’1’=’73%’ 0’ 10’ 20’ 30’ 40’ 50’ 60’ <’20’ 20’-’29’ 30’-’39’ 40’-’49’ 50’-’59’ 60’-’69’ 70’-’79’ 80’-’89’ 90’-’100’ Series1’ 300’30%’ 100’10%’
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Conserva>ve’forces’and’ poten>al’energy’ When’a’mass’moves’from’A’to’B,’the’work’ done’by’gravity’is’independent’of’the’path’ ’ ’ A’ B’
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A’block’can’either’slide’ fric>onlessly’down’a’ramp’(the’red’ path)’or’fall’oF’the’end’and’go’straight’down’(blue’path).’ In’which’case’does’it’have’more’speed’at’the’boKom? A. Sliding’(red’path)’ B. ±ree’fall’(blue’path)’ C. Neither’-’the’²nal’speeds’are’equal’ D. I’know’what’I³m’ supposed’ to’say,’but’it’ doesn³t’make’sense’
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A’block’can’either’slide’ fric>onlessly’down’a’ramp’(the’red’ path)’or’fall’oF’the’end’and’go’straight’down’(blue’path).’ In’which’case’does’it’have’more’speed’at’the’boKom? A. Sliding’(red’path)’ B. ±ree’fall’(blue’path)’ C. Neither’-’the’²nal’speeds’are’equal’ D. I’know’what’I³m’ supposed’ to’say,’but’it’ doesn³t’make’sense’
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Three’ways’of’looking’at’it’ Newton±s’2 nd ’Law’ Work-kine>c’energy’theorem’ Conserva>on’of’mechanical’energy’ W’ N’ W’
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Three’ways’of’looking’at’it’ Newton±s’2 nd ’Law’ F X ’=’mg’sin’ θ è ’ a X ’=’g’sin’ θ (down’ramp)’ v xf 2 ’–’v xi 2 ’=’2’a’ Δ x’=’2’g’ sin’ θ ( Δ h/sin’ θ ) =’2gh’ v xf 2 ’=’2gh’ W’ N’ W’
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