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Pour the water in before attaching a rope to the handle, then spin it in a complete circle over your head. And even when the bucket turns upside down at the top of the loop, the water remains inside instead of spilling out. You notice, as the bucket rotates, the water is made to travel in a circle …

Pour the water in before attaching a rope to the handle, then spin it in a complete circle over your head. And even when the bucket turns upside down at the top of the loop, the water remains inside instead of spilling out. You notice, as the bucket rotates, the water is made to travel in a circle too, and the force from the swing drives the water toward the base of the bucket, strong enough to overcome the gravity pulling it downward. But if you're not moving fast enough, the outward force bec