Apple - Floats - Apples are full of air and have a waxy skin that helps them stay on the surface., Metal Key - Sinks - A key is small but very heavy and made of dense metal — gravity pulls it down more than water can push it up., Sponge - Floats - A sponge has lots of holes filled with air, making it less dense than water. Even though it can absorb water, it usually floats at first., Coin - Sinks - Coins are small and very heavy for their size. They are more dense than water, so they sink quickly., Plastic Bottle - Floats - An empty bottle is full of air and is made from lightweight plastic, so it floats easily., Rubber Duck - Floats - Designed to float! It’s hollow and made of light rubber or plastic, with lots of air inside., Stone - Sinks - Stones are very dense — made of solid material with no air inside. They’re heavy and gravity pulls them straight down., Wooden Block - Floats - Most wood is less dense than water. Even though it feels solid, it’s made of materials with air between the fibres., Foil Ball - Sinks - When foil is scrunched tightly, it’s small and dense — not enough surface area to let water push it up., Foil shaped like a boat - Floats - Same material as the foil ball, but different shape! The boat shape spreads weight and traps air, making it float due to increased buoyancy., What do all the floating objects have in common? - They are light and full of air,

Float or Sink?

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