Sink and float
How does this sink and float work? Do you know what density means?
This will help students devise their own ideas about physical properties and how they can be used to describe and categorize objects. Ask students if they have any questions.
Examples of floating and sinking objects
Define float as the action of an object when it sits on the surface of a liquid. Ask students to describe things that they have seen sink or float. Place the object in the water and ask the students to describe what happens. Ask students to clean up any spills that may have happened, then to return to their seats. Place the items that sank in one pile and the items that floated in another pile. Describe them. Read out the definition of buoyancy from the Buoyancy worksheet. Next, divide the class into groups of four or five. Objects with more loosely packed molecules are less dense and float. Think about what happens when you put an ice cube into a glass of water. Objects with tightly packed molecules are denser and sink. More easy science activities:.
Look at the pile of objects that floated. The science behind the sink or float experiment Before explaining why items sink or float, ask your children why they think an object sinks or floats.
Then, explain that items sink or float based on their density. Place the object in the water and ask the students to describe what happens.
In later grades students can build a more complete understanding of these phenomena by measuring mass, displacing volumes, and calculating densities.
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