7 2 datasheet chap lab fluids force and floating | Buoyancy

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Name________________________________Class____________________Date____________________ Skills Practice Lab DATASHEET FOR CHAPTER LAB Fluids, Force, and Floating Why do some objects sink in fluids but others float? In this lab, you’ll get a sinking feeling as you determine that an object floats when its weight equals the buoyant force exerted by the surrounding fluid. OBJECTIVES Calculate the buoyant force on an object. Compare the
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   Name________________________________Class____________________Date____________________  Skills Practice Lab DATASHEET FOR CHAPTER LAB Fluids, Force, and Floating Why do some objects sink in fluids but others float? In this lab, you’ll get a sinking feeling as you determine that an object floats when its weight euals the  buoyant force e!erted by the surrounding fluid OBJECTIVES Calculate  the buoyant force on an object Compare  the buoyant force on an object with its weight ATERIALS ã  balance ã mass set ã  #a#er towels ã  #an, rectangular baking SAFET! I FORATIO PROCED#RE $ %se the table below to record your data easure$entTrial %Trial & Length (l), cmWidth (w), cmInitial height (h 1 ), cmInitial volume (V 1 ), cm   V 1 ! l ×  w ×  h 1 ew height (h # ), cm  ew total volume (V # ), cm  V #  ! l ×  w ×  h # $is%laced volume (&V), cm &V ! V #  ' V 1 ass o dis%laced water, gm ! &V ×  1 g*cm  Weight o dis%laced water, (buo+ant orce)Weight o %an and masses, &riginal content Co#yright ' by (olt, )inehart and Winston *dditions and changes to the srcinal content are the res#onsibility of the instructor  olt Science and -echnolog+./0orces in 0luids ã ruler, metric ã tub, #lastic, large rectangular  ã water    Name________________________________Class____________________Date____________________  0luids, 0orce, and 0loating continued  + ill the tank or tub half full with water -easure .in centimeters/ the length, width, and initial height of the water )ecord your measurements in the table 0 %sing the euation gi1en in the table, determine the initial 1olume of water in the tub )ecord your results in the table 2 3lace the #an in the water, and #lace masses in the #an 4ee# adding masses until the #an sinks to about three5uarters of its height )ecord the new height of the water in the table 6hen, use this 1alue to determine and record the new total 1olume of water #lus the 1olume of water dis#laced by the #an 7 Determine the 1olume of the water that was dis#laced by the #an and masses, and record this 1alue in the table 6he dis#laced 1olume is eual to the new total 1olume minus the initial 1olume 8 Determine the mass of the dis#laced water by multi#lying the dis#laced 1olume by its density .$ g9cm 0 / )ecord the mass in the table : Di1ide the mass by $;; 6he 1alue you get is the weight of the dis#laced water in newtons .N/ 6his is eual to the buoyant force )ecord the weight of the dis#laced water in the table < )emo1e the #an and masses, and determine their total mass .in grams/ using the balance Con1ert the mass to weight .N/, as you did in ste# : )ecord the weight of the masses and #an in the table = 3lace the em#ty #an back in the tub 3erform a second trial by re#eating ste#s 2>< 6his time, add masses until the #an is just about to sink A AL!'E THE RES#LTS $ Identi()ing Patterns  Com#are the buoyant force .the weight of the dis#laced water/ with the weight of the #an and masses for both trials  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  &riginal content Co#yright ' by (olt, )inehart and Winston *dditions and changes to the srcinal content are the res#onsibility of the instructor  olt Science and -echnolog+20orces in 0luids   Name________________________________Class____________________Date____________________  0luids, 0orce, and 0loating continued  + E*a$ining Data  (ow did the buoyant force differ between the two trials? !#lain   _____________________________________________________________________   _____________________________________________________________________   _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  DRA+ CO CL#SIO S 0 Draing Conclusions  @ased on your obser1ations, what would ha##en if you were to add e1en more mass to the #an than you did in the second trial? !#lain your answer in terms of the buoyant force  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________ 2 a-ing Predictions  What would ha##en if you #ut the masses in the water without the #an? What difference does the #an’s sha#e make? _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  _______________________________________________________________  &riginal content Co#yright ' by (olt, )inehart and Winston *dditions and changes to the srcinal content are the res#onsibility of the instructor  olt Science and -echnolog+10orces in 0luids  TEACHER RESO#RCE PA.E Skills Practice Lab DATASHEET FOR CHAPTER LAB Fluids, Force, and Floating Teac/er otes TIE RE0#IRED &ne to two 275minute class #eriods RATI .S 6eacher 3re#>$Atudent Aet5%#>+Conce#t Be1el>0Clean %#>$ ATERIALS 6he su##lies listed are for one grou# of 0>2 students 6he tank or tub should ha1e 1ertical sides * small or medium5sied tub works best because changes in 1olumecan be obser1ed easily -asses should be added near the center of the baking #an * fish tank or auarium works well for this acti1ity PREPARATIO OTES If you use a tub or #an without 1ertical sides, the buoyant force and the weight of the #an and the masses will not be eual In most cases, the buoyant force will be greater than the weight (a1e students measure the side of the baking #an, and mark the one5uarter, one5half, and three5uarter le1els *nalye the results LAB OTES olumes of liuids are usually e!#ressed in milliliters .mB/ (ere, the 1olume measurements for the water dis#laced are based on a rectangular container .the tank or tub/, so cubic centimeters .cm 0 / are used &riginal content Co#yright ' by (olt, )inehart and Winston *dditions and changes to the srcinal content are the res#onsibility of the instructor  olt Science and -echnolog+.0orces in 0luids S/aron L1 +ool(  Langston ughesiddle school3eston, Virginia
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