Mathematics and Society - OS X Lion Server

SUPPORTMaterials:Metre stick,2 magnets, rubber bandT~l; Ml;l;TING 01-=./VORT~A"lDSGUYWStudents will measure the strength ofmagnetic attraction using a nonstandardscale. They will alsoinvestigate how the force ofattraction is changed whenpaper is placed between themagnets.PULL UNTIL Tl-1E.TWO MAG"lE.T5 COMEAPART.ITape a rubber band to one end of a magnet and arrange in the starting position asshown.Lll\IE UP THE EIJD OF~'s c TI-iE FIR'5T MAGl-.lET WITHIV ., THE 0.0em MARK 010THE METER STICK.Cutting the rubber band and using it as asingle strand allows for a longer stretch.STARTI"lG POSITIOJ-JIIPlace the second magnet in contact with the first and slowly slide the combinationbeside the metre stick as shown in the top picture.Make ten trials.magnets separate.Each time record how far the rubber band stretches before theFind the average of the ten trials.Length ofStretches1) 3) 5) 7) 9)cm cm cm cm cm2) 4) 6) 8) 10)cm cm cm cm cmAverage stretch.___ cmIII Place a piece of paper between the two magnets.with the paper separating them.sk{APERC\==Jlj/L ~ M¥ !(IILength ofStretchesAverage stretch.Make another set of ten trials1) 3) 5) 7) 9)cm cm cm cm cm2) 4) 6) 8) 10)cm cm cm cm cm___ cmIV Instead of paper, try a small piece of metal. Again take ten trials and computethe average.Length ofStretches1) 3) 5) 7) 9)cm cm cm cm em2) 4) 6) 8) 10)cm cm cm cm cmAverage stretch.____ cmWhat effect did these materials have on the magnetic attraction of the two magnets?331