3 ms·
Has to be gravitational only. Otherwise positive mass is repelled from negative mass, but the negative mass accelerates towards it. So both masses accelerate in
by walrus1066 8y ago
Has to be gravitational only. Otherwise positive mass is repelled from negative mass, but the negative mass accelerates towards it. So both masses accelerate in the same direction, until they have infinite kinetic energy!
Conservation of energy & momentum would still hold, because negative mass would have negative energy & momentum, cancelling out that of the positive mass.
But the above surely would be an 'unphysical' situation.
- jon_richards 8y ago>Negative masses are a hypothetical form of matter that would have a type of negative gravity – repelling all other material around them. Unlike familiar positive mass matter, if a negative mass was pushed, it would accelerate towards you rather than away from you. Pretty sure the author means both. A continuously accelerating system seems "unphysical", but we have an example already: the accelerating expansion of the universe.