In this simple science experiment, ask children to predict whether an object will sink or float. Drop the items into water. Are they sinkers or floaters? Why?

• review
• share
  • Twitter
  • Facebook
• Add to My LearningRemove from My Learning

  Add to My Learning

Please login or signup to access printable content

For this activity:

1. Fill a large bowl, paddling pool, or water table.
2. Collect a variety of objects that sink or float. Make sure to collect objects that are similar in size but have vastly different densities, like a rock and a tennis ball.
3. Ask your junior scientist to predict whether the object will sink or float. Make a note of the predictions on a piece of paper or use the Junior Scientist Worksheet.
4. One-by-one, have the child drop each object into the water before classifying them as either “Floaters” or “Sinkers”. You can do this in the Observation section of the Junior Scientist Worksheet.
5. When all objects have been classified, use key questions to try and discuss why the object either floated or sank.
6. Talk about common qualities of the “Floaters” and the “Sinkers” and add your conclusion to the Junior Scientist Worksheet.