Sink or Float Science Activities & Worksheets | STEM Experiments Kindergarten–2nd Grade

Make science hands-on, engaging, and meaningful with these Sink or Float Science Activities & Worksheets! This printable resource helps students explore sinking and floating through prediction, testing, observation, recording results, and simple STEM investigations.

Students learn that size or weight alone does not determine whether an object will sink or float and explore how an object’s material, shape, construction, and trapped air can affect what happens in water.

What’s Included:

Sink & Float Concept Posters
Science Vocabulary Activities
Predict, Test, Observe & Record Activities
Sink or Float Prediction Worksheets
Hands-On Object Investigations
Compare Two Objects Activities
Same Material, Different Shape Investigation
STEM Design Challenge – Can You Make It Float?
Observation & Recording Worksheets
Sink or Float Science Journal
Cut-and-Make Mini Book
Sink or Float Review
Answer Keys
Teacher Instructions

The activities encourage students to make predictions, test real objects safely, observe what actually happens, compare results, and use evidence to develop early scientific thinking skills. Several investigations are intentionally open-ended because results depend on the actual objects and materials students test.

Perfect For:
Kindergarten, 1st Grade & 2nd Grade
Science Centers • STEM Centers • Small Groups • Whole-Class Investigations • Independent Practice • Homeschool Science

Quality You Can Trust:
Carefully Human-Reviewed for Quality & Accuracy. The resource has been checked by a person for content accuracy, clarity, age-appropriateness, and classroom usability to provide teachers with a more reliable ready-to-use resource.