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Work and Power

by: Daria

Work and Power 2070

Marketplace > Clemson University > Physics > 2070 > Work and Power
GPA 4.0

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About this Document

These notes go over work, kinetic energy, and power.
General Physics 1
Amy Pope
Class Notes
General Physics, Physics, kinetic energy, work, power
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This 3 page Class Notes was uploaded by Daria on Thursday October 6, 2016. The Class Notes belongs to 2070 at Clemson University taught by Amy Pope in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Physics 1 in Physics at Clemson University.


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Date Created: 10/06/16
Work   and   Power    Work  ● When   a force  acts  on an  object,  i does  work   on  the object.   ○ W=F*d  ○ Work   =  Force  *   isplacement  ■ The  force  must   be  PARALLEL   to the  displacement  ● Measured   in Joules  (Newton­meter)  ● Ifthere  is an  angle,  only the  cosine  of the  angle  times  the  force is what   i doing   the work.  Sine  of the  angle  times  the  force is doing  nothing.  ● Ifsomething    lides on  a  amp,   W=mgdsinθ   ○ Decreasing  the  angle  will decrease   the   ork  ● Ifthere  is more   than  one  force  acting  on an  object,  we  can  find the  work  done   by  each  force  then  determine   the net  force which   provides   the total work.  W=Fd=(Force   of man   on  fridge ­ Force  of friction)  ●   Positive  work Zero    ork Negative  work    Work   Example      More     ork  ● Positive  work   i ncreases  speed  ● Negative  work     ecreases   speed  ● Zero  work   has  no  effect on    peed.  ○ Falling  object    positive  ○ Throwing   object  up      egative  ○ Throwing   object  to side    zero    Work   Done  by  a Variable   Force  ● Work   is also the  area  underneath  the  graph   of force vs  position.  ● Integral  of  orce  graph.  ● Calculate   the  area    nderneath   the  graph    Work   Done  by  a 2pring  ● W=½  kx        Work     nergy     heorem  ● Kinetic  energy  is the  energy   associated   with  the motion  of an  object.  ○ K=   mv   2 2 ●    ●    ● Energy   transformations   within  the system   do not  change   the  totalenergy   in the system  ● Systems   are not  typically isolated   from  their environment   and  therefore  exchange   energy  with   he    nvironment  ● The   mechanical  transfer   of energy   is called  work,  W  ○ W>0    The   environment   does  work   on  the system   and  the  system’s   energy  increases  ○ W<0   The   system   does   work   on  the environment   and   the system’s  energy  decreases  ● The   total work   done  on  an  object  is equal  to its change   in kinetic energy.  ○ W= ΔK   1 2 1 2 ○ W  total= 2 v   f    2 mv  i   Examples  ● A  hockey  puck   (m=0.2   kg) slides  across   the rink with  an  initia speed  of 20  m/s.  Friction  (µk=0.1)  eventually  stops   the puck.   How   much   work  is done   by  friction?     ● A  70kg   golf cart starts  at rest and   accelerates  to 7m/s.   How   much   work   was   done  to  get to  this   onstant  speed?    ● To  accelerate  a  car from   rest  o a speed     requires   the   ork  W  .1    he    ork needed   o  accelerate   the car   rom    to 2v  i  W  .  2   ● A  1400kg   boat  has   a forward  force   of 4500   N  applied.  The   boat  starts  from  rest  and   travels  100  m.  What   is the final velocity  of the  boat?      Power  ● Power  is the  measure   of the rate  at which  work   is done  ● P=W/t  ● [P]  = [W]/[t]    J/s =  W   Watt)  ○ 1 horsepower   = hp       46 W  ● If an  object  is moving  at  a constant  speed   in the face  of  friction,gravity,  air resistance,   and  so  forth, the  power   exerted   by  the driving  force  can   be  written  ○ P      /t =  Fd/t    Fv    Power   Examples  ● To  pass   a slow   moving   truck, your  1300  kg  car  accelerates   from  12  m/s   to 20  m/s  in 3.00  s. What   is the minimum  power   required   for this pass?      Connecting    o forces  ● A  hockey   puck  (m=0.2   kg)  slides  across   the  rink with  an  initia speed   of 20  m/s.  Friction  (µk=0.1)   eventually   stops   the puck.   How  much   work   is done   by friction?   


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