Name:&_________________________________________&&&&&Date:&_________________&&&&&Block:&_____________&
Chapter(13:(Work(and(Energy(Study(Guide(
Directions:&Answer&all&of&the&questions&to&the&best&of&your&ability.&&To&make&it&most&like&the&test,&try&and&answer&
the&questions&without&notes&or&a&book.&&The&questions&you&cannot&answer&without&a&book/notes&are&topics&you&
need&to&study&more.&&NO&WORK.&NO&CREDIT.&NO&KIDDING.&
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1. List&2&first&class&levers:&_____________________________&and&________________________________.&
2. List&3&second&class&levers:&_________________________,&____________________________,&and&
____________________________.&
3. List&2&third&class&levers:&____________________________&and&________________________________.&
4. What&is&the&mechanical&advantage&of&a&ramp&that&is&17&meters&long&and&5&meters&high?&
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5. A&construction&worker&exerts&an&average&force&of&674&N&when&he&lifts&a&heavy&box&3.1&meters.&&How&
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6. How&much&power&is&required&to&do&278&J&of&work&in&3.9&seconds?&
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7. List&the&two&families&of&simple&machines&and&explain&why&they&are&different.&
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8. What&is&the&work&output&by&a&87%&efficient&lever&when&105&J&of&work&is&input?&
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9. A&bear&pushes&on&a&parked&truck&with&a&force&of&1200&N.&&The&truck&does&not&move.&&How&much&work&has&
the&bear&done&on&the&truck?&
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10. A&football&player&presses&a&479&N&weight&0.7&m&over&his&head&in&3.4&seconds.&&What&is&the&power&of&the&
football&player?&
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11. Give&four&examples&of&compound&machines.&
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12. A&piano&with&a&weight&of&290&N&is&dropped&from&the&top&of&a&building&and&falls&a&distance&of&187&m&to&the&
ground.&&How&much&work&does&gravity&do&on&the&object&from&the&time&it&is&dropped&to&the&time&it&hits&the&
ground?&
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13. A&factory&worker&pushes&a&heavy&crate&along&the&floor&of&the&factory&by&exerting&a&force&of&174&N.&&When&
he&has&gotten&the&crate&to&where&he&wanted&it,&the&crate&had&moved&9.1&m.&&How&much&work&did&the&
factory&worker&perform?&
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14. List&the&equations&found&in&this&chapter&and&what&each&letter&in&the&equation&means.&&There&are&6&
equations&(work,&power,&mechanical&advantage,&gravitational&potential&energy,&kinetic&energy,&and&
efficiency).&
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15. The&brakes&on&a&schoolbus&exert&a&frictional&forces&of&15,000&N&trying&to&get&the&bus&to&stop.&&If&the&work&
done&by&the&brakes&is&250,000&J&in&coming&to&a&stop,&how&many&meters&does&the&car&travel&after&the&
driver&applies&the&brakes?&
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Name:&_________________________________________&&&&&Date:&_________________&&&&&Block:&_____________&
Match&the&following&with&the&appropriate&definition.&
1.______&work& &
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2.______power&&
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3.______mechanical&advantage&&
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4.______wedge&&
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5.______screw& &
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6.______energy&&
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7.______potential&energy&
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A.&the&energy&that&an&object&has&because&of&the&&
&&&&&position,&shape,&or&condition&of&the&object&
B.&the&transfer&of&energy&to&an&object&by&the&&
&&&application&of&a&force&that&cause&the&object&to&
&&&move&in&the&direction&of&the&force&
C.&the&energy&of&an&object&due&to&the&object’s&&
&&&&&motion&
D.&the&amount&of&work&an&object&can&do&
&&&&&because&of&the&object’s&kinetic&and&potential&
&&&&&energies&
E.&expresses&how&much&a&machine&multiplies&
&&&&&force&or&distance&
&F.&makes&work&easier&by&reducing&the&force&
&&&&&required&to&do&work&
G.&a&machine&made&of&more&than&one&simple&&
&&&&&machine&&&&
H.&the&ability&to&do&work&
I.&a&modified&inclined&plane&
J.&an&inclined&plane&wrapped&around&a&cylinder&
K.&the&rate&at&which&work&is&done&
L.&energy&cannot&be&created&or&destroyed&
M.&a&quantity,&usually&expressed&as&a&
&&&&&percentage,&measuring&the&ratio&of&useful&
&&&&&work&output&to&work&input.&
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8.______&kinetic&&energy&&
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9.______efficiency&&
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10._____machine&&
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11._____mechanical&energy&& &
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12._____compound&machine&& &
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13._____law&of&conservation&of&energy&
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The answers
to the first 3
questions are
examples,
not an
exhaustive
list
seesaw
wheelbarrow
crowbar
nutcracker
bottle opener
tweezers
human mandible