ࡱ>  Jbjbj BD3D$wl"""6$8$8$8$8$8$8$%-(h8$"z """8$ M$###"v6$#"6$###0*'[z"#"$c$0$#(8#^(#(#""#"""""8$8$#"""$""""(""""""""" : ENERGY LESSON 3 Mechanical Energy Work is a force acting upon an object to cause a displacement. In all instances in which work is done, there is an object which supplies the force in order to do the work. If a World Civilization book is lifted to the top shelf of a student locker, then the student supplies the force to do the work on the book. If a plow is displaced across a field, then some form of farm equipment (usually a tractor or a horse) supplies the force to do the work on the plow. If a pitcher winds up and accelerates a baseball towards home plate, then the pitcher supplies the force to do the work on the baseball. If a roller coaster car is displaced from ground level to the top of the first drop of a roller coaster ride, then a chain driven by a motor supplies the force to do the work on the car. If a barbell is displaced from ground level to a height above a weightlifter's head, then the weightlifter is supplying a force to do work on the barbell. In all instances, an object which possesses some form of energy supplies the force to do the work. In the instances described here, the objects doing the work (a student, a tractor, a pitcher, a motor/chain) possess chemical potential energy stored in food or fuel which is transformed into work. In the process of doing work, the object which is doing the work exchanges energy with the object upon which the work is done. When the work is done upon the object, that object gains energy. The energy acquired by the objects upon which work is done is known as mechanical energy. Mechanical energy is the energy which is possessed by an object due to its motion or due to its position. Mechanical energy can be either  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy (energy of motion) or  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy (stored energy of position). A moving car possesses mechanical energy due to its motion ( HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy). A moving baseball possesses mechanical energy due to both its high speed ( HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy) and its vertical position above the ground (gravitational  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy). A World Civilization book at rest on the top shelf of a locker possesses mechanical energy due to its vertical position above the ground (gravitational  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy). A barbell lifted high above a weightlifter's head possesses mechanical energy due to its vertical position above the ground (gravitational  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy). A drawn bow possesses mechanical energy due to its stretched position (elastic  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy). Mechanical Energy as the Ability to Do Work Any object which possesses mechanical energy - whether it be in the form of  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy or  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy - is able to do work. That is, its mechanical energy enables that object to apply a force to another object in order to cause it to be displaced. A classic example involves the massive wrecking ball of a demolition machine. The wrecking ball is a massive object which is swung backwards to a high position and allowed to swing forward into building structure or other object in order to demolish it. Upon hitting the structure, the wrecking ball applies a force to it in order to cause the wall of the structure to be displaced.  INCLUDEPICTURE "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1d2.gif" \* MERGEFORMATINET  A hammer is a tool which utilizes mechanical energy to do work. The mechanical energy of a hammer gives the hammer its ability to apply a force to a nail in order to cause it to be displaced. Because the hammer has mechanical energy (in the form of  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy), it is able to do work on the nail.  The mechanical energy of a bowling ball gives the ball the ability to apply a force to a bowling pin in order to cause it to be displaced. Because the massive ball has mechanical energy (in the form of  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html" kinetic energy), it is able to do work on the pin. When a dart gun is loaded and the springs are compressed, it possesses mechanical energy. The mechanical energy of the compressed springs give the springs the ability to apply a force to the dart in order to cause it to be displaced. Because of the springs have mechanical energy (in the form of elastic  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy), it is able to do work on the dart. High speed winds are used to do work on the blades of a turbine at a so-called wind farm. The mechanical energy of the moving air give the air particles the ability to apply a force and cause a displacement of the blades. As the blades spin, their energy is subsequently converted into electrical energy (a non-mechanical form of energy) and supplied to homes and industries in order to run electrical appliances. The Total Mechanical Energy The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy (abbreviated TME). TME = PE + KE As discussed earlier, there are two forms of  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html" potential energy discussed in our course - gravitational potential energy and elastic potential energy. Given this fact, the above equation can be rewritten: TME = PEgrav + PEspring + KE The diagram below depicts the motion of Li Ping Phar (esteemed Chinese ski jumper) as she glides down the hill and makes one of her record-setting jumps.  INCLUDEPICTURE "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1d11.gif" \* MERGEFORMATINET  The total mechanical energy of Li Ping Phar is the sum of the potential and kinetic energies. The two forms of energy sum up to 50 000 Joules; the total mechanical energy of Li Ping Phar is a constant value throughout her motion. There are conditions under which the total mechanical energy will be a constant value and conditions under which it will be a changing value. For now, merely remember that total mechanical energy is the energy possessed by an object due to either its motion or its stored energy of position. The total amount of mechanical energy is merely the sum of these two forms of energy. And finally, an object with mechanical energy is able to do work on another object. Power The quantity  HYPERLINK "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1a.html" work has to do with a force causing a displacement. Work has nothing to do with the amount of time that this force acts to cause the displacement. Sometimes, the work is done very quickly and other times the work is done rather slowly. For example, a rock climber takes an abnormally long time to elevate her body up a few meters along the side of a cliff. On the other hand, a trail hiker (who selects the easier path up the mountain) might elevate her body a few meters in a short amount of time. The two people might do the same amount of work, yet the hiker does the work in considerably less time than the rock climber. The quantity which has to do with the rate at which a certain amount of work is done is known as the power. The hiker has a greater power rating than the rock climber. Power is the rate at which work is done. It is the work/time ratio. Mathematically, it is computed using the following equation.  INCLUDEPICTURE "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1e2.gif" \* MERGEFORMATINET  The standard metric unit of power is the Watt. A Watt is equivalent to a Joule/second. For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower = 750 Watts. All machines are typically described by a power rating. The power rating indicates the rate at which that machine can do work upon other objects. Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine which is given a power rating. The power rating relates to how rapidly the car can accelerate the car. Suppose that a 40-horsepower engine could accelerate the car from 0 mi/hr to 60 mi/hr in 16 seconds. If this were the case, then a car with four times the horsepower could do the same amount of work in one-fourth the time. That is, a 160-horsepower engine could accelerate the same car from 0 mi/hr to 60 mi/hr in 4 seconds. The point is that for the same amount of work, power and time are inversely proportional. The power equation suggests that a more powerful engine can do the same amount of work in less time. A person is also a machine which has a power rating. A common physics lab involves quickly climbing a flight of stairs and using mass, height and time information to determine a student's personal power. Despite the diagonal motion along the staircase, it is often assumed that the horizontal motion is constant and all the force from the steps are used to elevate the student upward at a constant speed. Thus, the weight of the student is equal to the force which does the work on the student and the height of the staircase is the upward displacement. QUESTION: Suppose that Ben Pumpiniron elevates his 80-kg body up the 2.0 meter stairwell in 1.8 seconds. If this were the case, then we could calculate Ben's power rating. It can be assumed that Ben must apply a 800-Newton downward force upon the stairs to elevate his body. By so doing, the stairs would push upward on Ben's body with just enough force to lift his body up the stairs. It can also be assumed that the angle between the force of the stairs on Ben and Ben's displacement is 0 degrees. With these two approximations, Ben's power rating could be determined as shown below.  INCLUDEPICTURE "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1e5.gif" \* MERGEFORMATINET  Ben's power rating is 871 Watts. He is quite a horse. The expression for power is work/time. And since the expression for work is force*displacement, the expression for power can be rewritten as (force*displacement)/time. Since the expression for velocity is displacement/time, the expression for power can be rewritten once more as force*velocity.  INCLUDEPICTURE "http://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1e6.gif" \* MERGEFORMATINET  This new equation for power reveals that a powerful machine is both strong (big force) and fast (big velocity). A machine which is strong enough to apply a big force to cause a displacement in a small mount of time (i.e., a big velocity) is a powerful machine. DEMO: Look at the cost of different household appliances based on their power requirements: http://www.article19.com/shockwave/ph.htm ENERGY LESSON 3 HOMEWORK Do WORKSHEETS p 25-27 1. Two physics students, Will N. Andable and Ben Pumpiniron, are in the weightlifting room. Will lifts the 100-pound barbell over his head 10 times in one minute; Ben lifts the 100-pound barbell over his head 10 times in 10 seconds. Which student does the most work? ______________ Which student delivers the most power? ______________ Explain your answers. 2. During a physics lab, Jack and Jill ran up a hill. Jack is twice as massive as Jill; yet Jill ascends the same distance in half the time. Who did the most work? ______________ Who delivered the most power? ______________ Explain your answers. 3. A tired squirrel (mass of approximately 1.0 kg) does push-ups by applying a force to elevate its center-of-mass by 5.0 cm in order to do a mere 0.50 Joule of work. If the tired squirrel does all this work in 2.0 seconds, then determine its power. Answer: P = 0.25 Watts 4. When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.250 meters in 2.00 seconds. What is the power delivered by the student's biceps? Answer: W = 103 J, P = 51.5 Watts 5. Your household's monthly electric bill is often expressed in kilowatt-hours. One kilowatt-hour is the amount of energy delivered by the flow of l.0 kilowatt of electricity for one hour. Use conversion factors to show how many joules of energy you get when you buy 1.0 kilowatt-hour of electricity. Answer: 3.6 x 106 Joules 6. An escalator is used to move 20 passengers every minute from the first floor of a department store to the second. The second floor is located 5.20 meters above the first floor. The average passenger's mass is 54.9 kg. Determine the power requirement of the escalator in order to move this number of passengers in this amount of time. (Note: 20 passengers is a definite number, not an approximation, therefore it is infinitely exact and does not affect sig figs.) Answer: P = 933 W ENERGY LESSON 3 HOMEWORK 1. Two physics students, Will N. Andable and Ben Pumpiniron, are in the weightlifting room. Will lifts the 100-pound barbell over his head 10 times in one minute; Ben lifts the 100-pound barbell over his head 10 times in 10 seconds. Which student does the most work? ______________ Which student delivers the most power? ______________ Explain your answers. Answer: Ben and Will do the same amount of work. They apply the same force to lift the same barbell the same distance above their heads. Yet, Ben is the most "power-full" since he does the same work in less time. Power and time are inversely proportional. 2. During a physics lab, Jack and Jill ran up a hill. Jack is twice as massive as Jill; yet Jill ascends the same distance in half the time. Who did the most work? ______________ Who delivered the most power? ______________ Explain your answers. Answer: Jack does more work than Jill. Jack must apply twice the force to lift his twice-as-massive body up the same flight of stairs. Yet, Jill is just as "power-full" as Jack. Jill does one-half the work yet does it one-half the time. The reduction in work done is compensated for by the reduction in time. 3. A tired squirrel (mass of approximately 1.0 kg) does push-ups by applying a force to elevate its center-of-mass by 5.0 cm in order to do a mere 0.50 Joule of work. If the tired squirrel does all this work in 2.0 seconds, then determine its power. Answer: The tired squirrel does 0.50 Joule of work in 2.0 seconds. The power rating of this squirrel is found by P = W / t = (0.50 J) / (2.0 s) = 0.25 Watts 4. When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2.00 seconds. What is the power delivered by the student's biceps? Answer: To raise her body upward at a constant speed, the student must apply a force which is equal to her weight (mg). The work done to lift her body is W = F * d = (411.6 N) * (0.250 m) W = 102.9 = 103 J The power is the work/time ratio which is (102.9 J) / (2 seconds) = 51.5 Watts (rounded) 5. Your household's monthly electric bill is often expressed in kilowatt-hours. One kilowatt-hour is the amount of energy delivered by the flow of l kilowatt of electricity for one hour. Use conversion factors to show how many joules of energy you get when you buy 1 kilowatt-hour of electricity. Answer: Using conversion factors, it can be shown that 1 kilo-watt*hour is equivalent to 3.6 x 106 Joules. First, convert 1 kW-hr to 1000 Watt-hours. Then convert 1000 Watt-hours to 3.6 x 106 Watt-seconds. Since a Watt-second is equivalent to a Joule, you have found your answer. 6. An escalator is used to move 20 passengers every minute from the first floor of a department store to the second. The second floor is located 5.20 meters above the first floor. The average passenger's mass is 54.9 kg. Determine the power requirement of the escalator in order to move this number of passengers in this amount of time. Answer: A good strategy would involve determining the work required to elevate one average passenger. Then multiply this value by 20 to determine the total work for elevating 20 passengers. Finally, the power can be determined by dividing this total work value by the time required to do the work. The solution goes as follows: W1 passenger = F d cos(0 deg) W1 passenger = (54.9 kg 9.8 m/s2) 5.20 m = 2798 J (rounded) W20 passengers = 55954 J (rounded) P = W20 passengers / time = (55954 J) / (60 s) P = 933 W !ab] ^ ~  ; < ; <     !qr˶֖֨֋||o|||o|֋hyhw0JCJaJjhyhwCJUaJhyh`]CJaJ#hyhw5B*CJ\aJphhyhw6CJ]aJ(jhyh5QCJUaJmHnHuhyh5QCJaJhyhwCJaJhyhwB*CJaJphhyh5QB*CJ$aJ$ph+"b^  < <  D8:f]^gd>x!^gd`]gd5Q^gd5Q$a$gd5Q01?@CD+,|}*+{|mn~#$45:ejkyz\]hyh>x!CJaJ#hyhw5B*CJ\aJphhyh`]CJaJhyhw0JCJaJhyhwCJaJjhyhwCJUaJB]45Q  7 T U V W _!!G"`gd$a$$a$^gd>x!JKYZNO  Z[eflm45P EFƹƹƹufhyhwB*CJaJph#hyhw5B*CJ\aJph#hyhu5B*CJ\aJph(jhyhrCJUaJmHnHuhyhrCJaJhyhw0JCJaJjhyhwCJUaJhyh>x!CJaJhyhwCJaJ(jhyhvZCJUaJmHnHu(F  7 ? C H N S T W [!\!]!^!!!!!F"G"""C#I#Q#j#l#m###$uuhyhw>*CJaJhyhuCJaJhyhlWCJaJj|#hyhwCJUaJhyCJaJ hyhwB*CJH*aJphhyhwB*CJaJphhyhCJaJhyhw0JCJaJjhyhwCJUaJhyhwCJaJ%G""m##$$$%n%%w&&c'''!(((m)*S*H++*,^gdN^gdN$a$^gdFV^gdu$$$,$-$}$~$$$$$%%m%n%%%v&w&&&b'c'{''''!("((((((((µѪѪѪџџџџёцwe#hyhw5B*CJ\aJphjn4hyhwCJUaJhyha"yCJaJhyhw6CJ]aJhyhFVCJaJhyhuCJaJhyhw0JCJaJjhyhwCJUaJhyhwCJaJhyhwB*CJaJph(jhyhuCJUaJmHnHu#(((() )Q)_)`)a)b)k)**R*S*G+H+++),*,,,--- ---../#/////d1e11111222 212222243533333444궧궘jDhyhwCJUaJjg;hyhwCJUaJjhyhwCJUaJhyhNCJaJhyhw5CJaJhyhw6CJ]aJhyhwCJaJhyh:roCJaJ<*,,, --.//d112 2222433444254565gdB] cgdN$a$^gdN)$$d%d&d'dNOPQa$gdN44444451525354565N555888888p9q999::::::<<<< =a=ձ禢{t{{{g{{_hwB*phh)5B*H*\ph h)6]h)5B*\phjh)CJUmHnHuh)h)B*phhwhw5B*\ph#hyhB]5B*CJ\aJph#hyh)2?5B*CJ\aJph#hyhw5B*CJ\aJphhyhwCJaJhyhw6CJ]aJ$65O5e566788888899999999::<<<<<<gd)gd)$a$gd)<<<<<<<<<<<<<< =]>s>>u?k@v@ABBBBCECFC$a$$a$gd^a=b=AABByB{BBB:CDCVC]CCCCCDDEEmEzEFFFFGGIJJ'J-~/mybGXBώ"htq  Q\ wBXJ\ ࠊ2=9dU}[n|U̾AKrz.,v+0ޠ;EϡQ@,a$p!d]Nǵ($rKZ+,+X1q~ 4p\ 0$u<q IX\6< flg}DAQf,b׷\#0ZCR}E}!%c5W:'y.vL/6#$,K5 VY9>'}l*_VEzca\.d7́[ sq?ͩ\ngwX Q0GW/dN5 6 y "5-cKK +^8KBOdO:sá['rmw]3vA40&)2\\, 8rI hzU)"cAXrgj^Z?~_Ep:1]%,)WZ/ Yu]f#ñO"ޟkx#K7QoOLoƈ訌CHot3=k.߸m>A65P-77|J?go$9]Tai:[.-?q'x > Ż ]xygpO\w3bT$.W*;+'=+9]K2|wp-ejsopg41`3͊nǂ.lȧ]ueEw/D~M<8š:cq("sN/ef 8ۧ‹%}f62vay2޼1ȑ:|T:/X(;sֺS9DίtNu=죢}vmQ7ro鯍ߢ_gFl퀾IJ aMZ/yC @%slOQs 84>>CFW:Dp^&a XYEp7@ _%\c^F'A aH³;iL.B @3G &9TUс 'TPs N r`MM+t"_SxY'Q' J 0Wh}`x[RT+FyDHL6._q,`aLmpSG[nb{m'L=k~+i4oJzt0|/h./QhgD Ӡ\} B}.wZš)Iw]\sz̀#aX'jpwoikzEmӍлDJI#ॏW(;{}90}S**ngJK(źn [mh1C)sQ}D@av˗Oɘu괇17 Dڶ6}4߄k@C;+[k1yfƞbƀL>3 9c#ӵmb+8i8(aMW9g W=g|Up1բC~ŽҎMJLNI8$#r,l ^H$n OQT4hPa M>w'?\͑hR迃B p?֫%hƣPNG  IHDRiAPLTE3f2fedfff2f2ːp:eee3e3eU+DDD222f2213E33223f3T̙2ee̘3eeef2˘33feef2ffee2f3ee3213f2fee˘˙22eefe˙2e2332ee3e32ee23fef̘e˘2˘f̘3e23233e3e32fe22332e3fe2f3ffee˘˙233e3e222e2e222e333fe2ffe3ee23fe33eefeee˙˙2f3e3e3ee2˘2ff̘f2e23f̘eeee332c@@@22ee2eUUUgre"ffwww"""333DT"2DTfv2D"2v2Q%bKGDH cmPPJCmp0712Hs{IDATx^u6 ]Qvnԑ("^$5E~Fx<;mۍps*]h0en"4 )Bc E[HJ$)5w'׈/FZ7؀# !Ce&5a  $?^q| ҞDd C4D_](4^ &(&4bTA84@8մl)IuF$`~2̙P06"Hf&cpE^FZ,d\yP!B K`{%JGl V C&gDJ@[k j~5l,:8nj|X2sc`{8+0\y΢'ߖ5c93rEp KX7ATb|e6iH3C?8@9I M8 mo?&ug:[vYm< fq/&)uG.@̡Ձ2\b" @єQ=tf ED/?|##NV~JI @)dz2#Hι79H-YvsH1df BX,Ät11@Ń/`r8j50K(m, ȴs_!)3) Y>P}N 2P0\)!A(yIz7W2.*IyKLU&gኦaMD ,IJ'Kj\;M7ϰ_.Kf㤁PSIBYZKE=S,.i@ XF4h ٰe[$(4nEScJzZ 3zP0-ԭ083 "u(@BVCڣlƌsƒKMfPЄ noe*CL&9&?hxw U`,"vM T5 ؘ6ٸdAh,3\BYPު9:h-kspZ:c/kVləH֡YћQ<ӔL(tuIs&/64ɵ]3s(?hM,Vgal9S.ufLu쭛 9 &=w: ۓWZ71L9LfŒtVaf(ݑ{ۼ8ܡJN +[V.*u:S56G>PGkf 5N#@a*=UaZ:3NȍNrx9M?Aoo}!Xuߏ ~"'DOW0'ewLپCr@ڑоLxkhx >aV#3a9Yxd 9~͉a lu=3<2s]0s)8ɳG"M2 l;\)iVF겑 /hzs,2׆ёCs0sv6KUAȄv(\ݲ~2G[,4fc_ <3<xl E}/ư%R΋$JрD#K`&JU^`qdQDj*Iz.EԢRlT-dO~4.aP[=:.֠34[#TISgMF: {> l*FK %_pXTf sbȘs c%) ȌxdN9!VkG#tCu.ĪebCg#ب4H}>\ѣqX ?6 FW)1L9qskB,;?7ОG.^QN?sbkejs8ǜ q0Fquϡ#w 3e=.v^.s^9 %v.1XsQ:81S!-cx907 E hSx JYZdhKz媴L|ֻ\a}NW~Ĕ Xq>q='; vAYğEWz$5~"ad>ͦԻqbxHa"f̨VSiE1 NQ~E•@WW  }lץ.\ĮP.`b Uļ8~?Rݸ'mĆ~y1{M&[ϔt'^)|\ q KQwFY֋tKy!9-΁+XMp-nن.Pw3i4p*C֣ Pa" /7'u%ncg@_WQ1:Hj(yJ4VdoS7Y u-ڍU ˻Sk,)JL}Ow9ju*;CP6B̑V5o)JdbW]]+"Z,Gfl>DdYpE\L&ˉ vb 5yQ(ъc*=b؅7u]\!1]UTc=]C&3_KRh9 .K7+j9q'ӀM '5Ϗ4m(!?A !@kې:O;Q,L'0Gknn{|i hz" ڱptsy`24@¯ JĂsWhTMhs+#ph ]uG~K RAxjǡg(!`:QqG?7|N`.{ t~owXǑ!i' 2w¾ Ң|QL˕Y8='D'ChF:0O=Ma)\m֙r Q<6@s:7i@H,M: aIWj2q4hFDL|a_!ύ Κ/0`&0P. -"@MV|{وz9 %7JvR{H@֢1^hPK`UMz 6ua;K:`;p:0 r 1} 0$6O/+B;vGD҂Pqpm)c Oo DPL(D@p`\J"JqWJ")f@H%Ò:!P$BaF' =-r,|(E٫g+s{\;r^npELhIfaSn;o`;ǿ p ]6/d@^ 2:ilY>H*GkJnP_PStŤ.==au!Kb`1X ,3>ba`Vyhэfh:T 'uv&I {N/A4 N3JuWfLIlh|Z.{$).HpsaYfUោ) 3T`+FyFM"UsD:ܴD\ ٺj_6fx}GvT^n)؆\=PUC]ļ<;s&_c)[XpeARB/t͗ .Ds. CzcKk-. ?Ym3zK6iZ={j~ew1X Fe[KG$5 (i|YKdlo4`gLJf?d{cplq&4g;Gi٠*':KRdM~s%HiXn:Qꃸq>g h'#C w{t]@Z[W\llPs4B'KH`h@^ãJ:{4`aAؔn4}Ef&9`p[NJ+Jvz ST*i¦%>9F9 EYxek.[b=Td_f! C/b2_WAhH{AӞdPNG  IHDR(PLTE3f2fedfff2f2ːp:eee3e3eU+DDD222f2213E33223f3T̙2ee̘3eeef2˘33feef2ffee2f3ee3213f2fee˘˙22eefe˙2e2332ee3e32ee23fef̘e˘2˘f̘3e23233e3e32fe22332e3fe2f3ffee˘˙233e3e222e2e222e333fe2ffe3ee23fe33eefeee˙˙2f3e3e3ee2˘2ff̘f2e23f̘eeee332c@@@22ee2eUUUgre"ffwww"""333DT"2DTfv2D"2v2Q%bKGDH cmPPJCmp0712Hs$IDATx^][rU#b o:;PդF>xE6edę8h9ǝw9pw9pρ>GQ!!:z!t˽eIB< ueG߷%P`Kfe2MrJEv<;l3U˿ f A+gzEXx}`=| \ 0DNq6dzL1GEDX֤y>+Ǖ~yy`،GBY F-蒟MX#>f)@dI1I|tWID7ssvy3xWf`SI Xme>u!&t7Un-JP#ʇSHt+6DĢyZ/_P)+X 12Mz45>?C|B|b"Cse7iT^U̘g -˰xwÇ8hOtƹ5b6?\eߌ4׌!sb*RG8G,OzvO 2v%nso,vqrWTBP8yQ !zB^[ƒغXDJWMaFb">W!Bބз++$`X0.@ږjpv5=*02'l„Od==Q@|5(fJ,i}!UiġFC@pe %Bn( 2_9x2X,pOb) ‡ȖŢ|d6$:ّ JZODowJhW9K T 'ĔPEx;T +D TtCLEPe%N1D&k9O^*h1.Fl~6T)jh[t_ 9 -Չ);R YvLHZp$myMOVjd\2haRNn>I,- a9<\ KxnvvE?f>tp^ܩPȎ<]no S"otHt%iRasjff&Yk=anS)s8M nqĄ!Nv8} b-3el(1\\AfuGz"5fxw(1s˕\y?U>K>20TlY|8.1a8+Ֆgϫ2Uk>VB.28d K&+K8tJ.ߓ4Ve]/aD,S̜vTtppwf &G"-ޏy_p+g~PZ 8DHrM#|ۍQB)˕.gf1P4e> M(!wT@z陔c+LL8nU7kn7d,>JȃJ%Ci ڔEZ|H)h\q5om)QY| ZwZEOvTg6K! vv#: F4PnK^ G*ݔkҩ^@ނV4Kܦȯ!~tď<ѵcwcέ2C]'qW("bdfJ 'Wb,1{݇"nR6\), UЉЎwUŕB^Ӕ;2/E"Nu/sP(ą@։,u?3͕*q^q`b ,~[1w[+e݃n^`H@Ldr\q\v5dkq\vR[smR^7 J{]#u\dN673#;o6y7o/rȋv3u$W&\z((k5CD X&K:}}&vܸRq*,Ƣ(ihbORrKQnmX_Z98]cx]D<{M/ 7+~2Ńz!v1!cԎ]#DlOձwA<?0G)k:Yz [T%+2SdYj3b頝Vmڵڍb71 CHX]m_# q|]5qr vTTFSNd%owk;H/rF~H%fp{r{Ĝ}!x51b^ޥC%D@٨#UQA3<1 `tZ$u<w CᔬFe.‘[O쯵1ϵ_ ҎFJ˲'4} rp@ǔqs(K)EdmNRr{fRu9f* \Y69~! -R7b`%U6O XOE HJ! 8ʕTE_-QS2Δئ.'"7>v ~= EIt~AZ;kh*e'C֍GPXٵT8Z$>? */FIkq!h{*Q|,o|IZK˯ V9SzQelVsH,^ C煕С,Uy.6Ikpi&6fCL_UB})0%#Jz2e^PKH\҉2-}8i@Oga!&!bֈɇȺp#pId2ٍBN(]U\ifײ7sƣvJeղ+ͷ<1 @j9kw 6Ѯ<^St~/ q2= h3h(ws(!]/x/h8Is8׎XF' VL%d7fWaJ(`SƯ˗/t틨4#.@@f:݃\ʸ0ꆫs9SQ73ݏ@(׎'%ţK UCN+,˓>)04h}RI:gyWb.fgzZ|Ώ7^V76`4IeF vEn>H<?$Xs[WQf|eo8a?ϋ 6!il?7xeZ_ 1:`΁;T$r>QiO[ezR5J5eqSRR=E =b4YkWa 鎇]4y.X{/UPU4) cTȣgb]T^2>^ߖ7Z{6Uգ|+q֐pX:*bm(+JߍxN:~>y{˳6~7!2Ө?΁;s΁;s΁!8x9KZUEyFhZ6v&qգLbI/g{=#{Nq/_vK< TDq*W$l CSݝhʙKa;Dt$sШOkCKf8HV/9;%3 \6bAr#F(\L%dT}FB!vvAIuCݝ(8j ,4TD@vʵ+¾3TkWR e;;/̑m 4!u>v@*@S7(DCK%ڀ.Ѳn_SwV܍^v$ʳW,=yjYr?e-мQxMI6^̢6B;x>S˨f嶂sT;E{>/Bw jG3)u9oO֐jc}u.\g [iDeTKhJhZDKte^] ̖fM[V`pZSu\&.rX?fxpo%} QBٴs .|Wv=Kw9b1:\-ߋO-Ҹdh!xHuC|Ԩj ުqpI$%xC[|Gt lj;gsQ\.7 G x n)_\xzz%߽jSLiʃ9I`TC`.fT;a4|#{ c(@ڑʺ }dIaDL%zE@\; "Km &w_O`5ky4'~Z}:ؤaQv&G ӳzpW_')yyBcD1i⊱TÂ>V:YB_O3Y ?B\q ߣpQDV 1.|4P|n?>2g}W <߉"Mɴla fp D UG]o$IH`r`KuD jVl` 0l}|/.O m\hRאi | 8m^tclXLz|F| 9nT؇/(?KplOR@_ Vۀ8!QiqzO5O/~sEt>Jϸp C|y<6Ń=1Пo _ךq2ϩGsgUH:×7*Mcڈ'<|󟋏ۂe#)lR!_lt<X.PڜJ3o1o[0I>>2.Gs?HShG `}Xdh (6M쏔o/Vrk>_SW(dpQ, eCS .'2T o27$Y'XOxKy{z} * $bXkg} p+;!B.d`Dr &3k]GTRU 2+k3`iZ,'2M׿NW %W-ЇE$Dj^Ȟ1#91)[g\/)!-OK })a:ōJEYn_J#bu_PڣUw٤*ҋh0Kr|ӾIM' ҿT@eiRETty#k>w#DL2 R`WxNqL.|_KK"^j/>J:l8'^;"I `ogiM?8xV~7&_?I^ऄMwo <% ]`6\_ƦaC5k8;"N `u)Ddƀêjc!i|*Ƙ8ƈL G^ech|XhòzBV6v{R:PQWc9nݣݾ]lӾ=tQ5)  E&./SXڔ_:jHţ.n@q2TP-v̄iinb2-hEh"yuShCvy:@ Ҍ24ԄkHɬ!,-n7:vre2(@Ak9dY"6mB,rz\/VtD?6Jm$̜#+<].!o:Ebd*6'껂CDc4Y#iMUzҡ.mg4uі]Qd9/g!deroFR#jo!A`ֲx(0SW](3"Ʈ [%l ۖ1w R(6PYܫ{I/|[멾) JKsza[?.e4& K0!(k>ܵic 4GelB1"s jvGјih+QOƜ-BktmtG8-Fj.'9rGB=iZ;վF,4i0ZswJ/ !De`д5.WfV/,M"oJGPCS:Z)rlQ2vX-c˭lQ#x=u|2KrW-Bx2;SrGtGث$+yqΙ#jx$+#sz I~"Qd!ɐ2BMl6G?:EUzhI=pI#[ܵ7B$ _Z R2(yQø1$TkM38u4|x489m+wJmgawV@au `܏]Ԑ:VevXayꦤ! ']A\<,M.j♨bu~BZ>U OeNԨrgΜr_68@؅2%թ ?b^= |BFM!b4zQ???Js=_m-ew&R n* oў}Րb"Dn"χfkgt>PNG  IHDR'PLTE3f2fedfff2f2ːp:eee3e3eU+DDD222f2213E33223f3T̙2ee̘3eeef2˘33feef2ffee2f3ee3213f2fee˘˙22eefe˙2e2332ee3e32ee23fef̘e˘2˘f̘3e23233e3e32fe22332e3fe2f3ffee˘˙233e3e222e2e222e333fe2ffe3ee23fe33eefeee˙˙2f3e3e3ee2˘2ff̘f2e23f̘eeee332c@@@22ee2eUUUgre"ffwww"""333DT"2DTfv2D"2v2Q%bKGDH cmPPJCmp0712HsIDATx^]Ir9^OSz4@2]- X2\P(ZY2d`20 L&d`20 Le3>faGZrt܇ >bBxh(8kJ Qatѭh-.?H> ?!} yD $tCZ/La<.w ՞ܹS?DP C8ηR̆p̤-lq)(8#(2 ^^³kc/7 Bd:-tEa_<ħho&70 ; 3|iPjOWǂ8qB|N0ͨBȀ:9.|'zW8;tC;^%0eϼDp.|sP$0>3 xrtưpvEI|rSv@~04|Q4 lAV$:oKx~]@>/OUQʬeH` W af6a܌8{ (+="QZ< Qbp')6aA:uJq㾽PBH^i 3SH d9<J޶g(YW  OJeTjuQR{u։'m|B2yT@ "|[yaT(v.ᏧLtMq)"4r/X6G9[/OL"Z`+뚈vU@lw"a5ͥbnnJܡk@_E5wO՚ZJ?+WϯK

Œ}@c)ڎB+u7QUڵ)G<+7yFehԵ{~/|jkKP93#pF4E >}~Pot!>C#SX؂ wCr!]+Ȼe/v-yK_g\ i,pZWB32_)4<%'abUAY?xOm]#OZ/(ƥJ5 &R.I5#sA%jO_I0Ag*Մ B-*o ^TƑwђK!J=HްtFUM }ܒaK[@2ByIbCҏR &!Xy&6p3rv[xBTUZRQׅP_!:̵Ouyo:!iătˢ$.$BC(xQ&De+Әo= inhcK׏Ϡ< W,#8!- d%ph6\B%qPj@g 564ah'Ik A+B78``~c^h3dud%GmG;8mꄠ@Cy ﾍltNt@[Tא^|| !TM ]$;FN{$WK,FUj&ؒ*(BAM|/x C"CxCϟ땄@zf@+0B!ׄv%|](PvNi-KU!,-s'I`)^}Cn4,GLdFn,:- aP6A^X~{h~hYPsa&%BxXxI{!ߚC&'DұVsܑŘ%B`x~պ(ذ* B [(զ}#r]ơp)B~B02ٴ DW2za.K0̭*M2"&Ys,P TwGh1Y5{ ,X4uoSǠz.dZ~EHa"*_ E VFmP]|\;⫂ ~苚it : o0:B xٖ `|e @P"Ho1v@ aJ dz<,qc!ĪK2Z=ˑw rjBP)_UKB¯B``anbeBd`>6`$K@+B\e}B(!5zB،s_{q%+qvjB@Ux4(}`:}~%bA43/kx, a-s#B{̱#lmLq.Y(v+[3Ů%;v ƳAB؄dp$zbNw[a:UclnBm;G8??F&V*\PХ5'3n|Ɔ(!YlB+;!d@Cc`xc`tV2e!#An(V =(:1ͣObh#b١jiBϷk=kbi/?"B!< \گåZD8ͅP*>4N]p,~? Q[kА>Py]Ғ_z~SX7' 5p㗹:c-ƗH)S-Hۈ.h zJ2Ud[rJr@xl]/85wKvo"Z`'Pˡa Y}B78A>q5G][=BC9/ B@'PkBJJdkeʭpAD3@](R2C2!F9/_z-9xȅ7H&bPf8Q,_ʓMe%O PX5A@vt#?c=^HId14Ц)=;!_mL+@B66`Gޮg1P~M#`Z2ĪF$bpttEe[?ZK sw1 eF|]ekc3$B]@+@. AZ#!r^*L#=kP&=L T2!`{s7~.tzډU=w{SgP-òR/]@1u 6¾}qn|D}w~ݖJhߦ@4w"0(~zwe hTQ@p#$f۾fgG' v;dҘ PO7Vz+Ԉ!#*#ِ;={&W TiCk~ N0mލ?z;tOɒEXlR;mEJ wa(!fgvr&Qohz$P+D|U.H1*:8[@6 ALVM%&ɄW@ *㊡ :(PƊ77cZ,g[}+s"fK%Ztȯp.H7}-;!ZD8n w#4Y Q=B zS`BH &*14l.pMokxMljf(Zk?{íPye)! .*P^;t A2F\951"z (y%a ϒ^޸@1 oLc B̨4޲jH0~0y\ qsaݲr6QB .!n u.+[GQ}Gޠ v ʥ|b{gex =bMYn h;KO&d`20 L&d`20 L&d`20 L&d`20 L&d`20 L&d`20 LU j#Yk5ɻ\0<կl>/s>_!3[Lzs`GZ{M|+W,|іX^쉌Rezޫ$[644)lё%|K!JhT0 6Gu  PK"Al3rM:c 16\m$\Y6]j m]ɭSDsLyB Z ~Җ 6QTC/ ,>ӏ X;*rc];0!cҲñjPm$q.uL`:譾Eꆮ[^ 2"UF%d1#m(تx O>aQ:CwRvtGj*;5v2\\w! ^DJ(tXd֦2ԬT2W,Ȋ|e|Y 6qn ˌRb2MpNSÄ\^lG&k^؃CLœi *+лКhR/zߦ)b'n+`=NkB`c+MwNG̈Ir5≐jz:<ؘu6Nn3+B",^`5\|ls) V#L*Ŭ.jd`p "Y m2.Iea^/eU+q#^ye^ySGGjLUɋĥ62m"qEDtM'LqWRVcMns rXZN^J%Z\-nVzD;;`ur{t0Z6$w*%qgAu@;p 3 L&d`2`(dkqZKUy EK9B^PWyS;o/O:]&D/?.=*Zzb.y&/pIe kbVUJ ,5Ҕ%B-QnWeWɒĝ쮺Oįy_p^+Wq jìzm(R`:"st~[ E2>g6M/_Oc 8@!gFߏI;([81mIgWª=1grڐD ʋLWwggzI:-8+V?mgXy= ˼%xz0`恬Cd^ {k+bV^e ̱&.(/%T!<8Hpxx^#j؍?O7v'պ8os\+*!/^;{x>;GwWˆH/jLAD_f\.۷ޙ>B$b >J Apv&ZHe'BǞ+5><Xp":QkPzLphfnvb7W]Bӡ:G|WwN6gL=3.9wzW~\Qd#o /D#*:XoJԞokЃ14ҋ%xvxz\5OÚ6[=" pIkjRoFQUzYP8^W Qn(\1T%if!n]3xJ Rfb|Kf P`PSf5 ]/^zz,6O$RiKu Eӣk~|!{EèA୕ޣG1 ocRuN`6f#j-7[93uOOk t 1w8< ú:=7ºkK7ڢ|=in$o0V[|tIXʱutN<tإǁ7 )7KoD7*Jov*W0 r-jfа`xCc1vmVηx8OX'8-ڡT]A:<3LOx%󝃥 B^9S8,:tG V?0,+>9Lt`^v-N .zY7dʙUʮoCL\ ,lNbwW`*#C;gc+Oevq8.Êo]"}o&95pI+YTIխtx1Vj-`mW<e:J%MhǷM _y]Qgpi06+MA!e`ͬlX,d <Y9_y5G hә7|Ee\pҩv1"jJ/VBL&F%S ~4iX4|vZB-32w ZF/JC/̆88Rc1y*? Xz_Sa!Y47\Qgpբǂ &r[ҩ87( =:f //[TQ0Ҽp 'r%W.-+y_crX^6`$0E4&ys+dWϖތ*3osz| K1&.[?u|8oއ)Q-@S~"k98 xaۚ6b'{W?4k|,-Q!o 7C fw}iJ2Cs 0;Dlf|x%6R|$6>qErF=O ScxLwpwpVgNC]Ů:i0&|õ7DdU]'hĝ’c %68 =?>7&»m) |'dy!~ sPXD$@O!]#̜ Dڄč˲oBz6=q,(vȎ%1BBnK* V/ P)&$/Ms$.IF$g k;8ǜx)] NC:S3-͙b֯G?]v{2"IN ռٳGgɒ ΣZB#Tp>S8#EmgX$Xa<8/_aE)7 P/OA[_PH $p/%q\S.^:&5E?tRYRhOh\},p*{얾Ht4If/v5x/V&S w>C390w`#*KX8%5>.CtbH|xɈ=S_)R׎gΪ ƀ1` ƀ1` ƀ1` ƀ1` ƀ1` ƀ1` ƀ1- 诹3(MEzh7x17Cd4-~nЯkVߓ:d\ ٤rmʅZ{'Dz*+3n8ކ!=6eաI5{h sx-37 !>7YD4;{fmI9ɨ N:4Nj.1 8e݁cN̥Ym36 Mln&Q7k&b4"ec1` ƀ1` A-`1*$&8/ q秲AP2$eƘ[V,7.)DS=g/*!HMLw̲ĄVR!8om}"!euEƂjTQy4"ofUHij2#2[E]~6y%S 37-˪4"*%VdԹsJH- KRYju}&dOCqPΦdLQ?Uy>¶ vKLaHLaH&gSi&7;'cN \g;ivN?͍H'#*qn[Pk{ޙNL? JO*=o*ܫDD͟s#uE^j:= Gd]+ ֽz6\/dDMDdU7Xڥҳ _]-X/ەJOZ׮Oܫd"@@@@@@@@@@@@,t D&ntM>yMDD`|kJ$yM > 5 p>!͉>#T9ݑVbWCziu5, >i]K,v 8dٵo/pUI<3ӟ9{&!UA"ECtd$s\ew֫4~Ǎ!%JJډ~S:o+nEm-қ%yӟG*hx,?T`OsVۯpԸ 7^6U{"9l8lP{"dl        ;wG"I۳JԐxjd2 D ^[$J5"Im(hFt`%%m%@eP9gJ{E0{!YB9j|b$B6666666666666666666666666666666666666666666666666hH6666666666666666666666666666666666666666666666666666666666666666662 0@P`p2( 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p 0@P`p8XV~_HmH nH sH tH @`@ NormalCJ_HaJmH sH tH N@"N  Heading 2dd@&[$\$5CJ$\aJ$N@2N  Heading 3dd@&[$\$5CJ\aJDA`D Default Paragraph FontViV 0 Table Normal :V 44 la (k ( 0No List B^@B  Normal (Web)dd[$\$6U@6  Hyperlink >*B*phPK![Content_Types].xmlj0Eжr(΢Iw},-j4 wP-t#bΙ{UTU^hd}㨫)*1P' ^W0)T9<l#$yi};~@(Hu* Dנz/0ǰ $ X3aZ,D0j~3߶b~i>3\`?/[G\!-Rk.sԻ..a濭?PK!֧6 _rels/.relsj0 }Q%v/C/}(h"O = C?hv=Ʌ%[xp{۵_Pѣ<1H0ORBdJE4b$q_6LR7`0̞O,En7Lib/SeеPK!kytheme/theme/themeManager.xml M @}w7c(EbˮCAǠҟ7՛K Y, e.|,H,lxɴIsQ}#Ր ֵ+!,^$j=GW)E+& 8PK!Ptheme/theme/theme1.xmlYOo6w toc'vuر-MniP@I}úama[إ4:lЯGRX^6؊>$ !)O^rC$y@/yH*񄴽)޵߻UDb`}"qۋJחX^)I`nEp)liV[]1M<OP6r=zgbIguSebORD۫qu gZo~ٺlAplxpT0+[}`jzAV2Fi@qv֬5\|ʜ̭NleXdsjcs7f W+Ն7`g ȘJj|h(KD- dXiJ؇(x$( :;˹! I_TS 1?E??ZBΪmU/?~xY'y5g&΋/ɋ>GMGeD3Vq%'#q$8K)fw9:ĵ x}rxwr:\TZaG*y8IjbRc|XŻǿI u3KGnD1NIBs RuK>V.EL+M2#'fi ~V vl{u8zH *:(W☕ ~JTe\O*tHGHY}KNP*ݾ˦TѼ9/#A7qZ$*c?qUnwN%Oi4 =3ڗP 1Pm \\9Mؓ2aD];Yt\[x]}Wr|]g- eW )6-rCSj id DЇAΜIqbJ#x꺃 6k#ASh&ʌt(Q%p%m&]caSl=X\P1Mh9MVdDAaVB[݈fJíP|8 քAV^f Hn- "d>znNJ ة>b&2vKyϼD:,AGm\nziÙ.uχYC6OMf3or$5NHT[XF64T,ќM0E)`#5XY`פ;%1U٥m;R>QD DcpU'&LE/pm%]8firS4d 7y\`JnίI R3U~7+׸#m qBiDi*L69mY&iHE=(K&N!V.KeLDĕ{D vEꦚdeNƟe(MN9ߜR6&3(a/DUz<{ˊYȳV)9Z[4^n5!J?Q3eBoCM m<.vpIYfZY_p[=al-Y}Nc͙ŋ4vfavl'SA8|*u{-ߟ0%M07%<ҍPK! ѐ'theme/theme/_rels/themeManager.xml.relsM 0wooӺ&݈Э5 6?$Q ,.aic21h:qm@RN;d`o7gK(M&$R(.1r'JЊT8V"AȻHu}|$b{P8g/]QAsم(#L[PK-![Content_Types].xmlPK-!֧6 +_rels/.relsPK-!kytheme/theme/themeManager.xmlPK-!Ptheme/theme/theme1.xmlPK-! ѐ' theme/theme/_rels/themeManager.xml.relsPK] B lF$(4a=J&(*+-.03]G"*,65<FCJJ'),/1245 q0?+ | * {  m ~ # 4    j y JYN ZlE[],}! d)))4+++BXXXXXXXXXXCXXXXCXTCTCTCTb$bX@k AN[5.lb$p?֫%hƣF 2{b$,JUw  b$\ f&Oe̼۝y xb$ z=x?DW<q1 b$ɓdoG= "b${Xc>AӞd5b$-KX6#!=m $b$͐eˠ_ b$eRB]+aP4Gb$2(cJ>V_ b$#3_bCV\b$X[iFm ~ 4b$҄'MwGĄIOQ> 5b$} tzQp^xO s@P(    s :Au5l1d63"?  s :Au5l1d73"?  s :Au5l1d33"?  s :Au5l1d43"?  s :Au5l1d93"?  s :Au5l1d53"?   s :Au5l1e13"?  s :A u5l1e83"?   s <Au5l1a123"?   s :Au5l1e93"?   s :A u5l1e83"?  s <Au5l1a123"?  s :Au5l1e93"? B S  ?e-0p1a5:;Ba% T_iS%" T~"Tm4 "TAc$T$[T >9D% TU#0T$ (T TU#0T$ (T T=CFN4'>'----,535<5F5c<f<BBB*1 bfnoE&H&''2**..//&6+6(8+8BBB3333333333333335Q! 4444 5<<B>x!?5)2?=QUvZ`]B]:roa"y9lWd^[y2u5QFV)'wNw^rw)BB@BP@UnknownG* Times New Roman5Symbol3. * ArialA BCambria Math"qhAGAG 8"y 8"y!20BB2QHX $P22!xxMechanical Energysteve SD23-UserOh+'0  < H T`hpxMechanical Energysteve Normal.dotm SD23-User2Microsoft Office Word@Ik@Nw[@Nw[ 8՜.+,D՜.+,P  hp  Hewlett-Packard Companyy"B Mechanical Energy TitleP  8@ _PID_HLINKSA Z>j0Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1a.html=j*Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html=j'Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html<j$Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html<j!Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html<jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html=jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html=jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html=jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html=jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html=j Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html<j Chttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html<jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html=jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1b.html<jChttp://www.glenbrook.k12.il.us/gbssci/Phys/Class/energy/u5l1c.html  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrsuvwxyz{|}~Root Entry F0-'[Data tP1Table(WordDocumentSummaryInformation(DocumentSummaryInformation8CompObjy  F'Microsoft Office Word 97-2003 Document MSWordDocWord.Document.89q