Swinging bucket of water

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How can you possibly turn a bucket upside down and not have the water spill out? We can show you how gravity works with this easy kids science experiment. Your kids will be amazed at how the science of gravity works in the spinning water experiment. Definitely an experiment best done outside! Hold the bucket's handle and start swinging the bucket in a vertical circle from the ground up to the sky.
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Backyard Roller Coaster Physics

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What keeps the water in the pail? – The Wonders of Physics – UW–Madison

Tie the string securely around the handle of a plastic bucket. Use a plastic bucket rather than metal so it is not heavy. Pour a glass full of water into the bucket. Hold the string so that the bucket is about level with your knees. Adjust length of string as needed.
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Centripetal Force

Have you ever seen a roller coaster loop its passengers all the way around in a circle? Hold the rope in your hand so that the bucket is around the same level as your knees when you hold it by your side and spin it around in a vertical circle, passing over your head at a swift speed. Instead, the water should remain in the bucket, just like the roller coaster passengers remain in their seats when they loop upside-down on the rides! When you simply turn a bucket upside-down, we know that the water falls out of the bucket because gravity is pulling it towards the earth, but the bucket doesn't fall because you are holding it above the earth - exerting a force opposite to gravity.
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The Demonstration: A bucket of water is spun in a vertical circle and the water stays in the bucket. Quick Physics: This is an example of centripetal circular motion. The water stays in the bucket because of inertia. The water wants to fly off from the circle, but the bucket gets in the way and keeps it in place.
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