Step 2: Teach Lesson
Read Mr. Gumpy’s Outing.
Place the items on the table and have the student predict which will sink or float. Record findings on a chart.
Drop items one at a time in water. Observe what happens and mark results on the chart. Discuss why certain items floated and
others sank. Compare predicted results with what actually happened.
Explain to the student when objects sink or float, they push water away. When water is pushed aside we call it displacement. If the
amount of water pushed aside by an object weighs more than the object, the water can hold it up and it sinks.
If an object placed in the water pushes away an amount of water that weighs less than the object, the water can’t hold it up and it
Have the student complete the worksheet below for extra practice.