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Water Pushes Up
Age 11 · Physics
When an object is under water, the water pushes it upward. The size of that push is the same as the weight of the water the object pushes out of the way.
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Age 11: open this week
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In the picture
- The metal cube in the water: the object that the water pushes upward.
- The spring scale above the tank: shows how much the cube pulls down while it is in the water.
- The beaker on the balance pan: the weight of the water that overflowed from the tank.
Examples
- A heavy rock feels lighter when you lift it under water.
- A boat floats because the water pushes up on it as much as the boat’s weight.
Key takeaways
- Water pushes up on anything placed in it.
- The upward push equals the weight of the water pushed aside.
Quiz: Water Pushes Up (Age 11)
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What does water do to an object placed in it?
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The upward push from water on an object is equal to what?
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If the water an object pushes aside weighs 10 units, how big is the upward push?
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