Aniglooisahousemadeoficeor snow.
ApplytheScience
Thesepenguinswanttobuildaniglooontopofthistable.Theyneedtoliftsomeice.Thebucketoficeisprettyheavy.PollyPenguinhasanideaforhowtoliftittoPeterPenguin.She’sgoingtotrytouseapulley....Youcantrythis, too!
Peter
table
chair
Polly
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
Peterhastheice,andthepenguinscancontinuetoworkontheirigloo together.