Sink Float Examples Worksheet
This Sink Float Examples Worksheet has 3rd graders sort eight everyday objects into Sinks and Floats columns, then name the object in four sentences. Answer key included for hands-on science practice.
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About this resource
Description
Why does a brick drop to the bottom of a tank while an apple bobs on the surface? That question is the first door into density, and it is the question this Sink Float Examples Worksheet puts in front of third graders. Instead of asking them to guess, it gives them eight familiar objects and asks them to decide, one at a time, which ones the water holds up and which ones it does not.
The sheet opens with a word box of eight everyday objects and a two-column chart headed Sinks and Floats. Students write each object in the column where it belongs, which forces a real decision about every single one rather than a quick sort of the obvious ones. The second half turns the skill around: four sentences each describe one object in water, and the student names the object and writes what it does. Every answer is keyed to how the object actually behaves, so this kindergarten density worksheet topic is handled here at real 3rd-grade rigor. An answer key is included.
What’s Included
- 1 print-ready PDF worksheet
- Answer key
- A word box of 8 everyday objects
- A two-column Sinks and Floats sorting chart
- 4 sentence items with object and answer lines
There are three reasons this resource helps children understand sinking and floating. First, the eight objects are chosen so that weight alone will not predict the answer: a small steel nail sinks while a much larger apple floats, which is exactly the puzzle density explains. Second, the objects in this Sink Float Examples Worksheet are printed in alphabetical order, so the box never hints at which column a word belongs in. Third, the four sentence items use different objects from the box, so students cannot answer the second half by copying the first.
Teachers and parents can turn this into a hands-on lesson in minutes. Fill a clear tub with water and test the real objects, one at a time, after students have committed to a prediction on paper. Ask what a prediction got wrong and why. Try the same object twice, once whole and once in pieces, and talk about what changed. A ball of clay that sinks and the same clay shaped into a boat that floats is the demonstration children remember longest.
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