Feather and Hammer (BBC)

Below is a famous video of an Apollo 15 astronaut conducting the feather and hammer demo on the Moon.

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And then there is this BBC video of the same demo conducted in a GIGANTIC vacuum chamber.

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On one hand, gravitational pull on an object is directly proportional to its mass (F=mg). On the other hand, the acceleration of an object is inversely proportional to its mass (Newton’s 2nd Law resulting in F=mg). These two factors together means that every object accelerates at g=9.81 m s-2 regardless of their masses.

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