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Home » Play and Learning » Science Fun » Sink or Float Preschool Science Experiment for Fall or Any Season!

Sink or Float Preschool Science Experiment for Fall or Any Season!

By Sarah of Little Bins for Little Hands 10 Comments

Disclosure: This site contains affiliate links; as an affiliate and Amazon Associate, I earn from qualifying purchases. Read my full disclosure policy for more information.

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A collage of 2 photos of a child doing a Fall Sink or Float Preschool Science Experiment using various Autumn-themed found objects and a sensory bin of water.
Disclosure: This blog post, contributed by Sarah of Little Bins for Little Hands, contains affiliate links. As an affiliate and Amazon Associate, I earn from qualifying purchases at no additional cost to you. Please read my full disclosure policy for more information.

Sensory play is a wonderful way to learn! Most of the time our sensory bin is filled with dry materials for sensory activities, but we also enjoy using water for sensory play. Although a little messy, water is perfect for indoor sensory play. And, it’s perfect for some easy sink or float preschool learning, too!

Some Easy Fall Sink or Float Preschool Science Fun

It has been a while since we’ve done a sink or float experiment, so I decided to put together a simple fall-themed sink and float activity. My son loves sensor play, so I knew it was time to set up this invitation for water play and scientific discovery.

A collage of 2 photos of a child doing a Fall Sink or Float Preschool Science Experiment using various Autumn-themed found objects and a sensory bin of water.

How to Set Up a Preschool Sink or Float Experiment

It doesn’t get much easier than this preschool science experiment. You simply need a tub of water (or you could even use a sink or bathtub) and two smaller bins or trays.

Then, fill one of the trays with a variety of waterproof objects. You can use any random household objects. Or, choose objects based around a specific theme.

A collage of 2 photos of the supplies for a Fall Preschool Sink or Float Experiment including plastic bins and Autumn-themed objects like leaves, pine cones, apples, and mini pumpkins.

We decided to make ours a Fall sink or float preschool activity. You can do any season, but for an Autumn theme, use objects like…

  • apples
  • mini pumpkins
  • mini gourds
  • acorns
  • pine cones
  • leaves
  • stones or pebbles
  • decorative rattan balls
  • Fall-themed vase fillers

You can also include some items your child can use as boats, like small baking pans and plastic or styrofoam egg carton pieces. I was hoping to inspire my preschooler to experiment with sinking a floating boat or keeping the boat afloat.


Using the Scientific Method to Hypothesize & Sort Fall Objects

Now, this Fall sink or float experiment is the perfect way to introduce young children to the Scientific Method and inspire some critical thinking. Just invite your child to explore and examine the various objects on the tray while discussing which objects might sink and float. For more advanced scientific learning, discuss the potential effects of size, weight, and density on the objects’ buoyancy.

A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like pine cones and pumpkins in a bin of water.

Then, invite your child to sort the items according to their predictions of buoyancy (whether they think it will sink or float) using the two trays. It’s okay if they sort some items incorrectly; that will make the science experiment more fun.


Preschool Learning with a Fall Sink or Float Experiment

Now, invite your child to test each object in the tub of water to see if the object sinks or floats.

My son was almost in disbelief when some of the items that he thought would sink, like apples, floated. He also predicted that the pebbles would float because they were small, but they sank because they are heavy.

A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like apples in a bin of water.

Again, you can discuss the scientific concepts related to their findings (the effects of size, weight, and density on buoyancy). Or, you can simple allow your child to absorb some of these concepts naturally through open-ended play and exploration.

A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like pine cones and pumpkins in a bin of water.

After you have tested each object for buoyancy, invite your child to explore the objects along with the pretend boats (egg crate pieces and baking pans). Challenge them to try to sink the boats by placing objects on them.

My son enjoyed trying different combinations of items in each pan 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. And, it took lighter items and fewer heavier ones. He also observed how just the right amount of items, like gems, in the baking pan would still allow it to float.

A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like pine cones and pumpkins in a bin of water.

Finally, have your child sort the objects again into the trays according to their scientific findings.

For added fun, I showed my son a photo I had taken of the two trays as he had sorted them before the science experiment so he could compare it to his findings. He had fun pointing out the differences. Lots of things he thought would sink actually floated. He remarked how he thought it was cool!

Supplies for a Fall Preschool Sink or Float Experiment including plastic bins and Autumn-themed objects like leaves, pine cones, apples, and mini pumpkins.

We wrapped up our preschool sink or float experiment with what else? Free play, of course!

Lots of splashing, sinking boats, making waves, and plunking acorns. The floor was a little wet when he finished, but it was all in the name of science!


Full Fall Sink or Float Experiment Instructions:

A collage of 2 photos of a child doing a Fall Sink or Float Preschool Science Experiment using various Autumn-themed found objects and a sensory bin of water.

Easy Fall Sink or Float Preschool Science Experiment

Set up this easy Fall sink or float preschool science experiment to introduce your child to the scientific method, buoyancy, and density.
5
PRINT PIN IT! RATE
Prep Time5 minutes minutes
Activity Time15 minutes minutes
Total Time20 minutes minutes

Tools

  • 1 large sensory bin (or large plastic bin)
  • 2 large plastic trays
  • silicone muffin pan (optional, ideally Fall-themed)
  • plastic food storage containers (optional, various sizes)

Materials

  • water
  • apples (real or artificial)
  • mini pumpkins (real or artificial)
  • acorns (real or artificial)
  • walnuts in shell
  • leaves (real or artificial)
  • pine cones
  • wicker rattan balls
  • river rocks
  • vase filler (or table scatter, ideally Fall-themed)
  • recycled styrofoam egg carton (cut into various sizes)

Steps

  • Fill sensory bin with around 6 inches of water.
  • Position trays near sensory bin, then place objects (apples, mini pumpkins, acorns, walnuts in shell, pine cones, leaves, wicker rattan balls, river rocks, vase filler) on one of them.
    A collage of 2 photos of the supplies for a Fall Preschool Sink or Float Experiment including plastic bins and Autumn-themed objects like leaves, pine cones, apples, and mini pumpkins.
  • Demonstrate and discuss the scientific concept of buoyancy by placing one floating and one sinking object in the water inside the sensory bin. Remove them and set aside.
  • Invite child to examine various objects and sort them on trays based on their hypothesis of whether each will sink or float. Discuss characteristics of objects (size, weight, density) while doing so.
    A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like pine cones and pumpkins in a bin of water.
  • Invite child to test hypotheses by placing objects, one at a time, in the water. Have child sort objects by results.
    A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like apples in a bin of water.
  • Invite child to explore the recycled styrofoam egg carton, food storage containers, and muffin pan as floating boats. Challenge them to place objects inside the boats to make them sink.
    A child doing a Fall Preschool Sink or Float Experiment with various Autumn-themed objects like pine cones and pumpkins in a bin of water.
  • Encourage imaginative and sensory play during and after the science experiment.
PIN FOR LATER EMAIL TO A FRIEND
Project Type: Learning · Play · Sensory
Category: Kid-Friendly · Seasonal

More Preschool Science Supplies and Kits on Amazon:

Get everything you need for the sink and float experiment above right from Amazon…

Artificial ApplesArtificial Apples220 Pcs Acrylic Fall Vase Filler220 Pcs Acrylic Fall Vase Filler150 PCS Natural Mini Pine Cones150 PCS Natural Mini Pine ConesECR4Kids 2-Station Sand and Water Adjustable Play TableECR4Kids 2-Station Sand and Water Adjustable Play Table15pcs Wicker Rattan Balls15pcs Wicker Rattan BallsArtificial Pumpkins SetArtificial Pumpkins Set15Inch Portable Sensory Bin Play Tray with Lid15Inch Portable Sensory Bin Play Tray with Lid50pcs Artificial Lifelike Acorn Set50pcs Artificial Lifelike Acorn Set7 Pack Plastic Activity Trays7 Pack Plastic Activity Trays

 

Or, try some of these all-inclusive preschool science kits and toys that make learning fun and easy….

Blippi My First Science: Sink or FloatBlippi My First Science: Sink or FloatWho Sank the Boat?Who Sank the Boat?Learning Resources Primary Science Sensory TubesLearning Resources Primary Science Sensory TubesLearning Resources Mix And Measure Activity SetLearning Resources Mix And Measure Activity SetVivi Loves Science: Sink or FloatVivi Loves Science: Sink or Floathand2mind Sensory Fidget Tubeshand2mind Sensory Fidget Tubesedxeducation Float or Sink Funedxeducation Float or Sink FunBattat 10 Bath BoatsBattat 10 Bath BoatsThings That Float and Things That Don'tThings That Float and Things That Don’tLearning Resources Splashology! Water Lab Science KitLearning Resources Splashology! Water Lab Science KitFloating and Sinking — Children’s Science Book About Basic PhysicsFloating and Sinking — Children’s Science Book About Basic PhysicsLearning Resources STEM Sink or Float Activity SetLearning Resources STEM Sink or Float Activity SetLearning Resources Primary Science Deluxe Lab SetLearning Resources Primary Science Deluxe Lab Set

 

And, find more educational toys and learning kits for kids in B-Inspired Mama’s Amazon Shop: Fun Finds for STEM Learning


Like this Preschool Sink or Float Activity? Save It & Share It!

A collage of 2 photos of a child doing a Fall Sink or Float Preschool Science Experiment using various Autumn-themed found objects and a sensory bin of water.

Don’t forget to save this fun preschool science experiment to come back to. And share it with friends! Simply use the buttons at the top or bottom of this post. Or, click here: Share on Facebook | Tweet It | Pin It | Email to a Friend


More Ideas for Preschool Sensory Fun:

  • 6 Fun Fall Activities from the Kids Co-Op
  • Sweet Citrus Sensory Tray
  • Animal Maze Play for Fine Motor Development

Disclosure: This blog post, contributed by Sarah of Little Bins for Little Hands, contains affiliate links. As an affiliate and Amazon Associate, I earn from qualifying purchases at no additional cost to you. Please read my full disclosure policy for more information.

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Filed Under: Fall, Play and Learning, Science Fun, Seasons, Sensory Play & Sensory Processing Tagged With: Autumn, Fall, Little Bins for Little Hands, Preschool, Science, Water

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Reader Interactions

Comments

  1. Alice @ Mums Make Lists says

    September 5, 2014 at 8:18 PM

    I love this idea Krissy and Sarah. We’re off foraging tomorrow for damsons, crab apples, sloes etc and picking conkers and it will be a fab end of day activity whilst we’re straining the fruit 🙂

    Reply
    • Krissy @ B-Inspired Mama says

      September 7, 2014 at 9:49 AM

      So glad you like it!

      Reply
  2. Jill says

    September 28, 2013 at 11:55 AM

    Sink or float is one of my favorite science experiments. It was always fun to see what they kids predicted and then what other items they wanted to float too. Thank you for linking up this week to the Thoughtful Spot Weekly Blog Hop 🙂

    Reply
  3. Sugar Aunts says

    September 28, 2013 at 3:18 AM

    Love this! We’re featuring your post on Share It Saturday this week over at Sugar Aunts! Thanks for linking up 🙂

    Reply
  4. Allison says

    September 27, 2013 at 6:26 PM

    Love the fall spin on this activity. I’ll be featuring this on The Sunday Showcase this weekend. Thanks for linking up!

    Reply
  5. Natalie says

    September 27, 2013 at 9:45 AM

    I love the items you chose for this experiment. I always find it fascinating that most of items in nature float – probably to spread their seeds… Thanks for sharing with Afterschool!

    Reply
  6. Missy says

    September 20, 2013 at 7:33 PM

    Thank you for sharing! I’ve pinned this 🙂

    I found your post through the Friday Flash Blog @ The Jenny
    Evolution.

    Reply

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