Fall Sink or Float Preschool Science Activity [Contributed by Little Bins for Little Hands]

This post was contributed by Sarah of Little Bins For Little Hands.

A Preschool Science Activity Perfect for Fall!

Sensory play is a wonderful way to learn in our house! Most times are bins are filled with dry materials for sensory activities, but we also enjoy using water for sensory play even if it isn’t warm outside! Although a little messy, it is still fun to do inside. Just prepare to be a little wet! It has been awhile since we have done a sink and float Preschool science activity, so why not do a fall themed sink and float experiment. He loves science experiments, so I knew it was time to set up this invitation to play again. I know apples float, but I was curious to see what he thought!

Fall Sink or Float Preschool Science Activity at B-Inspired Mama

I created this invitation to experiment by choosing lots of fall items for him to experiment with, including items that have been in our sensory bin, and placing them on our favorite tray. This time I also included some items, baking tins and egg carton pieces, that could double as boats. I was hoping to have him experiment with sinking a floating boat or keeping the boat floating!

Our Fall Sink or Float Preschool Science Activity

Sorting Fall Materials for a Preschool Science Experiment at B-Inspired Mama

Here’s what we used:

  • apples, red and green
  • mini pumpkin
  • acorns
  • walnuts
  • leaves (fake)
  • pine cones
  • stones and gems
  • craft store rattan balls
  • silicone baking tray apple
  • large and small aluminum loaf pans
  • egg carton pieces (cardboard kind)

Using the Scientific Method to Hypothesize & Sort Fall Objects

Sorting Objects for a Fall Preschool Science Activity at B-Inspired Mama

To start off the science experiment, we used the Scientific Method to think about which items on the tray would float and which items would sink. I put out two tubs for him to put the items into for sink or float. We talked a little about why he thought an item would sink or float including weight and size. I was glad he chose some things incorrectly, so he could really see an experiment in action! Also, I had him help me fill the bin with warm water. (I find that if the water is on the warm side it is more enjoyable). We have a large bin on wheels that he rolls over to the sink and uses the hose attachment on the faucet. It’s quite a treat!

Experimenting with Sink or Float

Floating Apples in a Fall Preschool Science Activity at B-Inspired Mama

Once the bin was filled, he chose the sink items first. He was almost in disbelief that some of the items that he thought would sink, like the apples, did not! He had also chosen the gems as floating because they were small, but they really sank because they were heavy! The large aluminum baking pan was a sink item and the small one was a float item, but he noticed that they both float. I was glad he commented on it all and remembered whether he had chosen something to sink or float! We repeated the process for each item in both bins.

Experimenting with Fall Objects in Water for a Preschool Science Activity at B-Inspired Mama

When we were finished determining what each item would do, I asked him to try to sink the pretend boats (aluminum pans, silicone apple, and egg crate). He tried putting different combinations of items into each pan to see what was just enough or too much and separating smaller items and bigger items between the different boats. He noticed it took a lot of items to sink the large pan and fewer items to sink the little one. Or it took more lighter items and fewer heavier ones! Another observation was that just the right amount of items like the gems in the apple tray would still let the apple tray float.

Experimenting with Sink or Float in a Preschool Science Activity at B-Inspired Mama

The final part of the sink and float experiment was to put everything back into the two bins, still choosing sink and float. This time however, the task was using actual observation rather than just thinking about it. I showed him a picture of the two bins before we started the experiment and he pointed out the differences! Lots of things he thought would sink actually floated! He remarked it was so cool!

Sorting What Sinks and What Floats for a Fall Preschool Science Activity at B-Inspired Mama

We wrapped up our Preschool science activity with what else? Free play of course! Lots of splashing, sinking ships, making waves and plunking walnuts and acorns. The floor was a little wet when he finished but it was all in the name of science!

Sarah is a stay at home mama to one energetic four year old boy. Hands-on learning and sensory play are a big part of each day’s lessons and activities. Liam has Aspergers Syndrome and SPD, so each day is unique and a bit messy but fun! She is author of Little Bins For Little Hands.

I love the science emphasis of this Fall themed sensory activity.  Brilliant.  And FUN!  Thanks, Sarah!

More Preschool Science Activity Ideas


What is your kids’ favorite Preschool science activity?   Share about it in the comments below!

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About Krissy Bonning-Gould

Krissy Bonning-Gould is a former art teacher turned full-time mama of 3 who authors B-Inspired Mama to share inspiration for simple kids crafts, family recipes, learning fun, and creative parenting.

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