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### Repulsive gravity [duplicate]

IANAP, so feel free to berate me for thinking apocryphal thoughts! Just as magnetism has two charges, in which particles of like-charge repulse and particles of dissimilar charge attract, might ...
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### Why gravity is an attractive force? [duplicate]

Why gravity is an attractive force? One may say that it is because of space time curvature but General Relativity is built on this law: $\displaystyle G \frac{m_1 \times m_2}{r^2}$ (To be more ...
1 vote
1k views

### Gravitational Force (conceptual) [duplicate]

Why is gravitational force always an attractive force? And is the Newtonian formula of gravitational force applicable for very small particles like electrons and protons etc.? From Formula of ...
1 vote
202 views

### Why masses attract each other? [duplicate]

According to the gravitational law, every mass attracts each other. But why the masses attract each other? Why they don't repel each other?
1 vote
209 views

### Origin of gravitational force [duplicate]

My teacher asked me a question to tell what the origin of gravitation or gravitational force was. In other words, what causes gravitational forces? I considered some theories that it may be due to ...
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### Attractiveness of spin 2 gauge theories [duplicate]

Possible Duplicate: Why is gravitation force always attractive? I have heard that the attractiveness of gravitation is due to the fact that it is a spin 2 gauge theory. Why is this so? I find ...
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### Forces are confusing? [duplicate]

Why is gravitational force only a pull force ? And why does any force even exist between two uncharged particles . Shouldn't the positive negative attraction be nullified by the positive - positive ...
33 views

### Mass and Gravitational Force [duplicate]

Why do mass has a tendency to attract other masses and form bigger cluster of mass? What cause gravitational force to exist? Is it so that at one point of time all matter in universe will form ...
122k views

### Why do same/opposite electric charges repel/attract each other, respectively?

I know plus pushes another plus away, but why, really, do they do that? On the other hand, molecules of the same type are attracted to each other. I find that weird. I do know some stuff about four ...
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### Misused physics analogies [closed]

Have you noticed that many questions and misconceptions in physics arise due to misuse of analogies, which were invented to "explain in simple words" some physical phenomena? For example there is a "...
6k views

### Can we model gravitation as a repulsive force? [closed]

This question is actually related to my earlier question ("what is motion"). The fact that objects move a lot in the universe and that the universe is expanding, can imply that gravity is a repulsive ...
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### Vacuum and repulsive gravity

How can one show from General Relativity that gravity is attractive force, and under which conditions it becomes repulsive, also why positive energy vacuum drives repulsive gravity?
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### Is anti-gravity (i.e. repulsive gravity) possible in theoretical physics?

Is anti-gravity (i.e. repulsive gravity) possible in string theory? I have read some articles about scientists making assumptions about the existence of anti-gravity, but is it possible in string ...
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### Why should mass be attractive in nature?

Why does a mass attract all the masses around it? Why should't it repel or just stay calm? Why should it be like that?