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ScienceEngineering

Deep-Sea Submersible Test Tank

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Grades 3-560-90 minSource: Creative Dad Company

Kids build a small submersible that can sink, rise, and retrieve a sample from the bottom of a water tank by controlling its buoyancy. It's a wet, hands-on physics challenge that makes floating and sinking endlessly satisfying to test.

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Prep: 10 minActivity: 45 min1 session~$2/groupOne table or a clear section of floorBeginner-friendly

Setup

Place common or recycled supplies for Deep-Sea Submersible Test Tank on one work surface and choose a safe area for the test. Read the four activity directions aloud; drawings, paper models, and household substitutes may replace specialized materials, and no digital tool is required.

Activity

  1. Test a plain sealed bottle in water and predict what changes would make it sink, float, or hover in the middle.
  2. Build the submersible with adjustable weight and an air chamber, then attach a simple claw or hook for retrieving a sample.
  3. Test the submersible's dive and retrieval, then redesign the weight or air balance when it sinks too fast, won't come back up, or can't grab the sample.
  4. Demonstrate a full dive-and-retrieve mission for the group, reporting what buoyancy adjustments made it work.

Done when: The group produces the Deep-Sea Submersible Test Tank solution, completes the described test, makes the revision called for by the evidence, and supports its final explanation with an observed or measured result.

Materials

plastic bottles, clay or small weights, balloons or air tubing, a large clear bin filled with water, small toy objects as samples, tape

Shown for the Quick Start version — switch tabs above to see what changes.

Disclosure: Materials links below go to Amazon. As an Amazon Associate, Creative Dad Company earns from qualifying purchases at no extra cost to you.

Steps

  1. Test a plain sealed bottle in water and predict what changes would make it sink, float, or hover in the middle.
  2. Build the submersible with adjustable weight and an air chamber, then attach a simple claw or hook for retrieving a sample.
  3. Test the submersible's dive and retrieval, then redesign the weight or air balance when it sinks too fast, won't come back up, or can't grab the sample.
  4. Demonstrate a full dive-and-retrieve mission for the group, reporting what buoyancy adjustments made it work.

Standards it satisfies

  • NGSS · 3-PS2-1

    Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.