What you'll need:
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Here's how to do it
Have your child come up with examples of objects that sink and objects that float in water. Discuss why a boat floats and a rock sinks. Have your child make a three-column chart on paper. Have him label the first column "Objects," the second column "Predictions" and the third column "Outcomes."
Display the objects you have collected and have your child write each object in the first column. In the second column have your child predict if the object will sink or float and discuss with him why he made this prediction. Then have your child place each object in the water and observe as it sinks or floats. Have him write the outcomes in the third column of the chart. Discuss the results with your child. What did the objects that sank have in common? How about the objects that floated? At this age your child does not need to understand the concept of buoyancy, but if you would like more information check out Exploratorium: Bouyancy
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