Dropping a stone into the ocean’s deepest point—the Mariana Trench—reveals just how dramatically water resists motion.
Though gravity pulls the stone downward, it only accelerates briefly before reaching its terminal velocity, the speed at which water drag perfectly balances the downward force. For an average fist-sized rock, this terminal velocity is roughly 1.6 feet per second, translating to nearly six hours to reach the trench's 36,000-foot floor.
Even a heavier, denser object might only shave that time down to about an hour.
This surprisingly slow descent underscores the immense drag force water exerts on sinking objects. Unlike in air, where objects fall rapidly, the ocean acts like a thick, resistant cushion, slowing descent to a crawl once terminal velocity is reached. It’s a powerful reminder that the deep sea isn’t just vast—it’s a medium where the laws of physics play out at an entirely different pace.
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