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Ships can float, because the water they are floating in pushes upward against them. This pushing force is called upthrust. The size of the upthrust depends on how much water the object pushes out of the way.The force which pushes the ship up is also  called the buoyancy force

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Ships floats on water because the amount of water that they displace, weight more than the ship itself. It is known as law of buoyancy.

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