WheelsThatDon'tRoll
Thinkaboutadoorknob.Theknobisawheel.Youuseyourhandtoturnit.Theaxleisconnectedtotheknob.Itrunsthroughthedoor.Youuseforcetoturntheknob.Theknobthenturnstheaxle.Theaxlemovesthelatchinand out.
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Alloftheseobjectsuseawheeland axle.
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WheelsandAxlesCanBeFun
WhataboutaFerriswheel?It’sjustalargewheelandaxle.Itsmotorsuppliestheforcetoturntheaxle.Theaxlemakesasmallcircle.Ittravelsashort distance.
Thecarsattheouteredgeofthewheelmakeabiggercircle.Theymovealongerdistance.Thebigcircleletstheridersclimbhighintothesky.Whata view!
AFerriswheelisaHUGEwheeland axle!