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SCWhen the teacher swirls the water, she creates a small circular current in the jar. This moving water applies an upward force on the orange and helps overcome the slight suction and friction holding it at the bottom.
By spinning the water, she changes the pressure and flow around the orange. The moving water redistributes forces evenly and allows buoyancy to do its job, lifting the orange to the top without needing to reach in or spill water.
It’s a simple but great demonstration of buoyancy, fluid motion, and how understanding physics can turn a tricky problem into an easy one.
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