unit16新教材课件
日期：2010-12-08 12:41
soyouhavetoaddsomethingHefixedalong，sharppieceofmetaltothetopofthelongeststickofthecrossYouhavetostopthekitefromflyingaway，What’stheaimofthisexperiment?HewantedtoshowthatlightningandelectricityarethesameWecan’tgoandlookforlightning，sowehavetofindawaytomakelightningcometousHeattractedlightningbyusingakiteAkitemadeofpaperwon’tlastlonginrainyweatherHehadtomakeastrongkite:thekitewasmadeofsilkHowcanyoubuildtheframeofakite?BuildtheframeofthekitebymakingasmallcrossoftwopiecesoflightwoodHowcanyoumakeakite?BuildtheframeofthekiteAndtiethecornersofthehandkerchieftothepointsofthecrossAddatailtotheframeandtiealongstringtothecrosssoyoucancontrolthekiteAsilkkitedoesn’tattractlightning，withouttouchingthestringthatwouldbechargedwithelectricityHetiedasilkribbontothestringthathekeptdrybystandinginsidetheshedYouhavetomakesurethatyouyourselfwon’tbehitbythelightningSohehadtofindalowplacewherehecouldkeephimselfandhistoolsdryY，
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