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In this video, you will learn more about the history of buoyancy. With easy-to-understand illustrations and clear verbal explanations, you will become even more of an expert of how boats stay floating.

Boats can have many different shaped hulls. Every shape has an important purpose. Large boats that carry heavy loads usually have what is called a displacement hull. These are wide and spread the weight of the boat out. Small, personal boats have planning hulls. These spread the weight of the boat well if it’s not moving but pop up out of the water if the boat goes fast.

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Making Connections


Have you ever been on a boat? If so, how big was it? If not, what kind of boat would you first want to go on?


Have you read any other books that discuss density and mass? How were they similar to and different from this book?


How do you think boats changed the world? Write a few sentences explaining your answer.

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