Why did the flag wave on the moon?
In: Physics
They spun the flag while planting it. That gives initial angular momentum for the flag. When they stopped doing it, the the horizontal bar that hold the flag stopped. The flag, however, continued to move due to its inertia, resulting in a wavy motion. On Earth this also happens, but the motion quickly dies out due to large air drag. Since there is no air on the moon, the motion lasts much longer.
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