Science Projects > Physics & Engineering Projects > Sink or Float? A Hands‑On Science Adventure in Density 

Sink or Float? A Hands‑On Science Adventure in Density

Use the free Sink or Float Worksheet with the “Sink or Float?” science project to encourage kids to make predictions, conduct tests, and record their results! Engage young learners with this classic experiment, a hands-on activity that introduces kids to the concepts of density and buoyancy. This simple yet effective experiment encourages observation, prediction, and critical thinking.

This project is perfect for indoor discovery, especially in colder months! Remember to put a towel under a large container of water for easy clean up. If the weather is nice, try taking the experiment outdoors.

Sink or Float

Take the project further by testing even more objects. You may need to print out multiple copies of the worksheet. Here are some additional ideas of things to test:

  • Rubber duck
  • Tennis ball
  • Bell pepper
  • Banana
  • Empty glass bottle or jar with a lid
  • Plastic water bottle (with or without water)

Discussion Points

  • Density: Explain that objects denser than water will sink, while those less dense will float. What objects did they expect to sink, but actually could float? What objects did they think would float but sank instead?
  • Material Composition: Discuss how the material of an object affects its buoyancy. What objects were hollow or filled with air? Did that make a difference? For example, a hollow plastic bottle may float due to trapped air, while a solid metal spoon sinks because it is denser than water.
  • Surface Area: Larger surface areas can distribute weight more evenly, aiding flotation.

Explore Further with Sink or Float Fun

We hope you enjoy the Sink or Float Worksheet! For more information on density, buoyancy, and the properties of water, check out our “Learn About Water” Science Lesson. Additionally, you might even try experimenting with different temperatures or salt levels next. For instance, did you know objects float more easily in salty water like the Dead Sea? These variations can spark deeper curiosity and discoveries!

Teaching Homeschool

Welcome! After you finish this article, we invite you to read other articles to assist you in teaching science at home on the Resource Center, which consists of hundreds of free science articles!

Shop for Science Supplies!

Home Science Tools offers a wide variety of science products and kits. Find affordable beakers, dissection supplies, chemicals, microscopes, and everything else you need to teach science for all ages!

Related Articles

Do Different Colors Attract Insects? A Pan Trap Experiment 

Do Different Colors Attract Insects? A Pan Trap Experiment 

So... what is a pan trap experiment? Well, you'll find out in just a second. But first, have you ever noticed bees buzzing around yellow flowers or flies gathering near bright colors outdoors? Many insects rely on color to help them find food and shelter. Scientists...

Outdoor Toys for Kids That Spark Scientific Curiosity in Nature

Outdoor Toys for Kids That Spark Scientific Curiosity in Nature

Children are natural explorers. A patch of grass, a collection of rocks, or a busy ant trail can become the starting point for meaningful scientific discovery. Outdoor toys for kids help transform everyday outdoor spaces into environments where observation,...

Why Insects Are Attracted to Light: A Night Investigation 

Why Insects Are Attracted to Light: A Night Investigation 

Why insects are attracted to light becomes clear during a night investigation, when they gather around light sources after sunset. It’s a pattern students notice quickly as activity increases around porch lights and flashlights.  That simple observation...

Crystal Growing Kit: A Fun Introduction to STEM Learning

Crystal Growing Kit: A Fun Introduction to STEM Learning

Hands-on science activities help students connect classroom concepts with real-world observations. A crystal growing kit is an engaging way to explore chemistry, scientific observation, and critical thinking through a simple experiment. Watching crystals...

should I learn computer coding