An igloo is a house made of ice or snow.
Apply the Science
These penguins are building an igloo, but they need more ice.
Polly Penguin needs to deliver the bucket of ice to Peter Penguin.
The bucket of ice is pretty heavy. Polly has an idea for how to lift it
to Peter. She’s going to try to use a pulley.... You can try this, too!
Peter Penguin
table
chair
Polly Penguin
chair
bucket of ice
rope
a broom handle
1
Peter lays the broom handle between the two chairs. Polly ties one end of the rope to the ice bucket. She loops the other end of the rope around the broom handle. She’s made a simple pulley. She gives the rope a pull, but it’s not enough to lift the bucket.
2
Peter is still waiting for the ice. So, Polly tries another approach. This time, she ties one end of the rope to the broom handle. She loops the rope through the handle of the ice bucket and around the broom handle. Now, Polly has made a compound pulley. She’s able to lift the bucket all the way to the top.
3
Success! Peter has the ice, and the penguins can continue to work on their igloo together.