Sink & Float Investigation

Hands-On Science for Preschool

Quick Answer

A tray-based science investigation where preschoolers test objects in water to see what happens, building early inquiry skills through prediction, observation, comparison, and retesting.

What’s Included

• Sink & Float Investigation main sign

• 6 “Try This” action cards for independent exploration

• 6 “Think About It” prompt cards for guided reflection

• 4 vocabulary word cards (cut apart or post as a word wall)

• Half-sheet recording page (draw + optional circle)

• Teacher Guide with exact Preschool Vibes Standards alignment

How to Use

Fill a clear bin with water and add a variety of test objects with different materials and weights. Display the investigation sign and keep the “Try This” cards accessible so children can independently experiment. Use the “Think About It” cards during small group or teacher-supported moments to deepen language and reasoning.

This investigation works well as:

• An independent science center

• A small group inquiry lesson

• A whole-group demonstration followed by center exploration

Why It Works

This investigation supports purposeful play while building real scientific thinking. Children make predictions, test ideas, observe results, and compare outcomes. They use vocabulary like sink, float, heavy, and light in meaningful context.

Aligned Preschool Vibes Standards include:

• We can observe using our senses and describe what we notice.

• We can make predictions about what might happen.

• We can test ideas and notice what happened.

• We can compare and describe materials and their properties (hard/soft, heavy/light, float/sink, transparent/opaque).

• We can use vocabulary to describe, explain, and share ideas.

• We can stay with an activity and keep trying when it’s challenging.

This resource keeps science developmentally appropriate, hands-on, and structured without overwhelming teachers or students.