Sink or Float Activity
This sink or float activity has kindergarten and 1st grade scientists predict and sort 12 picture cards on a Float and Sink mat, then circle new floating objects. Answer key included.
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About this resource
Description
This sink or float activity invites young scientists to predict which everyday objects will sink and which will float in water. Children look at 12 picture cards, such as a rubber duck, a rock, a leaf and a metal key, and decide where each one belongs. Light objects and objects full of air often float, while heavy, solid objects made of metal or stone usually sink.
How to Use This Activity
Cut apart the picture cards and give each pair or small group the sorting mat. The mat has a Float box and a Sink box, each beside a simple tub picture, so the labels stay in view while children sort. Children take a card, say what it shows, think about whether it will sink or float, and place it in the matching box. A kindergarten practice worksheet then asks children to circle nine new objects that will float in water.
What’s Included
- A How to Use page with steps, prep tips and an extension idea
- 12 sink or float picture cards, six that float and six that sink
- A sorting mat with a Float box and a Sink box
- A kindergarten practice worksheet: circle the things that float
- An answer key for the card sort and the practice page
Why Sorting Helps Kids Learn Science
First, making a prediction before testing is the heart of the scientific method, and this activity gives children lots of quick practice. Second, sorting real objects helps children notice properties like weight and material. Third, the cards can be tested with a tub of water, so children see for themselves whether their guesses were right.
Ideas for Teachers and Parents
Use the cards at a science center, in a small group or at home during bath time. After sorting, fill a tub with water and test a few safe objects from around the room. This kindergarten density activity also works well with first graders who are ready to explain why an object floats. Pair the sink or float activity with the resources below for more practice.
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