Kepler's Law vs Newton's Amendment

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    Kepler's law Law
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The discussion centers on a specific equation presented in a YouTube video regarding the center of mass in physics. The equation, dm = d(M)/(m+M), is derived from the definition of center of mass. The notation used in the video may cause confusion, as 'dm' refers to the distance from the center of mass to a small mass m, while d(M) represents the product of the large mass M and the distance between the two masses. Clarification of these terms helps in understanding the relationship better. This explanation aids in grasping the underlying physics concepts related to Kepler's Law and Newton's amendments.
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scottshannon said:
She writes a relationship at 4 min which is

dm=d(M)/(m+M).
That comes from the definition of center of mass. Perhaps her notation is confusing you. She uses 'dm' to represent the distance from the center of mass to the small mass m; d(M) represents the large mass M times the distance between the masses d.
 

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