Sink or Float

By Jenna Richter | April 6, 2016 | Science

Today, in small group time, I had the students make and test predictions about sinking and floating and then classify objects according to whether they sink or float.

I asked the students to each choose two objects from our studio area that were smaller than the palm of their hand and wouldn’t be ruined by water for our experiment.  Next, they wrote the names of the objects on a sink/float chart.

Audrey chose a shell and a button. The shell floated at first, which surprised us but later filled with water and sunk!
Audrey chose a shell and a button. The shell floated at first, which surprised us but later filled with water and sank!

 

After all the items were on the chart, students made predictions about which thinks would float and sink.

 

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Finally, we put our theories to the test.  Some of the things floated at first and then became waterlogged and sank to the bottom.  By the end of the experiment, only the cork and the googly eye were on the surface of the water.

Our chart shows an O where something started out floating and then sank.
Our chart shows an O where something started out floating and then sank.