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Float or sink investigation

Last updated: 27/06/2026
KS1 float or sink science investigation lesson
Main Subject
Key stage
Category
Science
Resource type
Complete lesson
Student activity
Teaching ideas
Worksheet

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Help KS1 learners have fun and explore the properties of a range of natural and man-made objects with this engaging float or sink science investigation lesson and worksheet. 

What's included

  • Free printable PDF lesson and worksheet resource for KS1 learners as they complete a floating or sinking investigation with a range of objects. 
  • For subscribers only, an adaptable and customisable PowerPoint lesson and Word document worksheet resource. 

Available as a free PDF download, or access the editable version as a subscriber.

Float or sink KS1 science investigation resource

Designed for KS1 children, this comprehensive float or sink science investigation is perfect for helping them understand the vocabulary that can be used to describe objects and their properties, basic scientific experiments and the ways in which results can be recorded.

This lesson would work well as a cross-curricular element in conjunction with a natural world activity, such as exploring outdoors and collecting natural objects. These can then be used as part of the float or sink experiment. 

How to use this resource

This complete lesson resource can be used as a standalone lesson or as part of a scientific investigation scheme of work based around water or natural/man-made objects. 

The lesson is ideal as an introduction to objects and their floating or sinking capabilities and includes a worksheet for children to complete their investigation and record their findings. 

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Why not try some of these KS1 science resources to help your curious young scientists to enhance their knowledge and understanding?

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A sample extract from the resource:

We are learning to:

Explore different objects in water.

Make sensible guesses before testing.

Watch carefully and talk about what we notice.

Use scientific words to describe what happens.

Success criteria:

I can make a prediction.

I can test an object in water.

I can say whether it floats or sinks.

I can explain what I observed.

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