An iglooisahousemadeoficeor snow.
ApplytheScience
PollyandPeterwanttobuildanigloo.Theyneedtolifticetothetable.Theicebucketisheavy.Pollyhasanidea.She’sgoingtouseapulley.Youcantrythis, too!
Peter
table
chair
Polly
chair
bucketof ice
rope
abroom handle
1
Peterputsabroomhandlebetweentwochairs.Pollytiesoneendoftheropetotheicebucket.Sheloopstheotherendoftheropearoundthebroomhandle.She’smadeasimplepulley.Shegivestheropeapull.It’snotenoughtoliftthe bucket!
2
Pollytriesagain.Shetiesoneendoftheropetothebroomhandle.Sheloopstherestoftheropearoundthehandle.Pollyhasmadeacompoundpulley.Sheliftsthebuckettothe table.
3
PollyandPetercanbuildtheir igloo.