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Float or Sink Test

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Float or Sink Test

Description

Gather a handful of small household objects and test them one by one in a bowl of cool water - predicting before each drop, then sorting into floaters and sinkers. Practices prediction and observation through simple hands-on testing.

What to prep

  • large_bowl
  • water
  • small_household_objects
  • tray_or_towel
  • plates_for_sorting
Cost: FreeBest time: Anytime

Play guide

  1. 1Fill a large bowl halfway with cool water and set it on a tray or in the sink to catch drips. Gather 8-12 small household objects (spoon, small toy, coin, leaf, cork, small stone, eraser - all at least 3cm for under-4s).
  2. 2Before dropping each object, ask "what do you think - will it float or sink?" Listen to their prediction without hinting.
  3. 3Drop the object in together and watch. Name what happens: "It's floating - it's staying on top" or "It sank - it went to the bottom."
  4. 4Sort the tested objects into two groups on a dry surface nearby - floaters in one pile, sinkers in another.
  5. 5After testing everything, look at both groups: "What do the floaters have in common? What about the sinkers?" Accept whatever observations they offer.

Success signals

Your child makes a prediction before each test, even if they're often wrong. They notice the result and name it ("it floated!") without prompting. They begin to make a pattern ("I think all the heavy ones sink"), even if the pattern is incomplete or incorrect

If it's tricky

Your child skips predicting and just wants to drop things in: Slow down by holding the object up and asking "what do you think?" before releasing - wait for an answer before dropping. They're frustrated that predictions are wrong: Reframe: "A wrong prediction is the most interesting one - it means there's a surprise!" The sorting into groups doesn't hold their interest: Drop the sorting and just test and observe. Some objects fall in a grey zone (a plastic lid that half-floats): Celebrate the ambiguity: "This one is tricky - what do you think is happening?"