十万个为什么·科学启蒙30篇（4）
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Why Spinning Tops Stay Upright Longer
为什么陀螺旋转时更稳
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A spinning top stays upright because of a physics principle called angular momentum.
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When it spins fast, its mass resists changes in orientation due to rotational inertia.
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Gravity pulls the top downward, but the spinning motion creates a stabilizing gyroscopic effect.
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This effect causes the top to wobble slowly instead of tipping over immediately.
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Friction with the surface gradually slows the spin and reduces angular momentum.
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As speed drops, the gyroscopic force weakens and the top begins to tilt.
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Eventually, when rotation becomes too slow, gravity wins and it falls.
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Engineers use this same principle in satellites and navigation systems.
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Bicycle wheels also benefit from angular momentum while moving forward.
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The faster something spins, the more stable its axis tends to remain.