Aniglooisahousemadeoficeor snow.
ApplytheScience
Thesepenguinsarebuildinganigloo,buttheyneedmoreice.
PollyPenguinneedstodeliverthebucketoficetoPeterPenguin.
Thebucketoficeisprettyheavy.Pollyhasanideaforhowtoliftit
toPeter.She’sgoingtotrytouseapulley....Youcantrythis, too!
Peter Penguin
table
chair
Polly Penguin
chair
bucketof ice
rope
abroom handle
1
Peterlaysthebroomhandlebetweenthetwochairs.Pollytiesoneendoftheropetotheicebucket.Sheloopstheotherendoftheropearoundthebroomhandle.She’smadeasimplepulley.Shegivestheropeapull,butit’snotenoughtoliftthe bucket.
2
Peterisstillwaitingfortheice.So,Pollytriesanotherapproach.Thistime,shetiesoneendoftheropetothebroomhandle.Sheloopstheropethroughthehandleoftheicebucketandaroundthebroomhandle.Now,Pollyhasmadeacompoundpulley.She’sabletoliftthebucketallthewaytothe top.
3
Success!Peterhastheice,and thepenguinscancontinuetoworkontheirigloo together.