Sink or Float for Kids: Predict and Test in Water (Kindergarten to Grade 2 Science)

Hi, I'm Luna from DoodleBeez. Today we are doing a splashy science test called sink or float. We will drop things into water and find out which ones go down and which ones stay on top.

First we predict. That means making a smart guess before we test. Will a rubber duck sink or float? I think it will float. Now we test it. Plop! It floats. My prediction was right!

Some things sink to the bottom. A rock, a metal spoon and a coin all sink. They are heavy for their size. The water cannot hold them up, so down they go.

Other things float on top. A leaf, a cork, a plastic ball and a piece of wood all float. They are light for their size, so the water pushes them up and holds them.

Here is a surprise. A big log floats, but a tiny pebble sinks! So being big is not the secret. What matters is what something is made of, and how heavy it is for its size.

Shape matters too. Roll some clay into a ball and it sinks. Press the same clay into a boat shape with tall sides, and it floats! The boat shape spreads out and pushes aside more water.

Now it's your turn. Will an apple sink or float? Make your prediction. Pause and try. It floats! An apple has lots of tiny air spaces inside, so it is light for its size.

Great job! Remember, predict first, then test. Things that are heavy for their size sink. Things that are light for their size float, and shape can change it too. Practice sink or float in the Science Lab at doodlebeez.com. See you next time!