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If there were really an object of negative mass, would its gravity (antigravity?) attract or repel objects with positive mass?
by jeffdavis 10y ago
If there were really an object of negative mass, would its gravity (antigravity?) attract or repel objects with positive mass?
- thaumasiotes 10y agoAs far as I know, there are two definitions of mass: (1) Mass is defined by gravitational interaction with other mass, F = G m_1 m_2 / d^2 . This would mean that a negative mass, by definition, repels positive masses and attracts negative masses. (2) Mass measures resistance to acceleration, F = m a . By this definition, a negative mass would, if you pushed on it, accelerate toward you. That seems like the start of a nasty feedback loop. But, according to gilgoomesh's comment, that's what's happening here.