Float your own paper boat
Fold and decorate a paper boat, then test how it floats and change weight or shape to explore buoyancy and simple problem-solving.
Step-by-step guide to float your own paper boat
Step 1
Choose one sheet of paper and clear a flat clean workspace to fold on.
Step 2
Fold the paper in half lengthwise (hot-dog style) and press the crease firmly.
Step 3
Open the paper and fold the top two corners down toward the center crease so the top forms a triangle.
Step 4
Fold the bottom edge of the front layer up over the base of the triangle and crease it.
Step 5
Flip the paper over and fold the other bottom edge up on the back side and crease it.
Step 6
Open the bottom of the folded paper and press it flat to make a square (a triangle hat shape).
Step 7
Fold the bottom corner of the square up on both sides so you make a smaller triangle and crease.
Step 8
Gently open the bottom of the triangle into a diamond and press the sides flat.
Step 9
Hold the top points of the diamond and pull them apart slowly to form the boat hull and flatten the bottom so it sits upright.
Step 10
Decorate your boat with colouring materials and use clear tape to reinforce any weak spots; let any marker ink dry before testing.
Step 11
Fill the tray or bowl with water and place your boat on the water gently to see if it floats.
Step 12
Add one small weight into the boat and watch whether it still floats or tips; remove the weight after observing.
Step 13
Change your boatâs shape by pinching or folding the hull slightly and test it again to see how shape affects floating.
Step 14
Share your finished creation on DIY.org
Final steps
You're almost there! Complete all the steps, bring your creation to life, post it, and conquer the challenge!
Help!?
I donât have clear tape to reinforce weak spotsâwhat can I use instead?
Use packing tape, a strip of clear contact paper, or small dabs of white glue (let them dry) to reinforce the weak spots mentioned in the decorate step.
My boat tips over or fills with water when I place it in the bowlâhow can I fix that?
Make sure all creases are pressed firmly (especially the bottom so it 'sits upright'), flatten the hull as instructed, reinforce seams with tape, and remove extra weight before testing.
How can I change this activity for younger or older kids?
For younger children, pre-fold through the triangle/hat stages and let them decorate and test in a shallow tray with supervision, while older kids can add weights, alter the hull shape per the 'change your boatâs shape' step, and record float trials.
How can we make the boat more interesting or test its performance further?
Add a paper sail on a straw or toothpick, waterproof the hull with extra tape or clear contact paper, race multiple decorated boats across the tray, and count how many small weights each design holds before sinking to extend the add-one-weight step.
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Facts about buoyancy and floating
𧪠A paper boat floats because it displaces an amount of water equal to its weight â that's buoyancy at work.
đ A wider, flatter hull spreads the boat's weight over more water and usually keeps a paper boat afloat better than a skinny shape.
đŁ Paper boats are a simple form of origami and have been made as children's toys for centuries around the world.
đŻď¸ Sealing paper with wax, tape, or a thin layer of oil helps prevent quick soaking and can make a boat float longer.
đŞ You can often add small weights (like a paperclip) to a paper boat to test how much extra it can carry before it sinks.
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