How many forces do we know off in physics?

[hallenrm]

This is on the lighter side, just to pinch our young colleagues! Come on count the number of forces you are aware of, look at the numbers posted by others and correct them if you can.

[Jay-qu]

In order of decreasing strength, Strong Nuclear, Electro-magnetism, Weak Nuclear and Gravity. If my math is right that makes 4 though I think some of the forces are linked and appear seperate, while they may actually be manifestations of the same force..

[ronthepon]

Let me take the juicy chance to point out that the strong nuclear force is a 'spill over' form of the quark-quark force.

[Little Bang]

Opinion #1244561

I think all the forces in the universe are a manifestation of the positive and negative charges of the quarks, and that includes gravity.

[Tormod]

Lemmesee...gravity, taxation, and death.

[arkain101]

I think there is another force??

The Casimir Effect Force:

-In physics, the Casimir effect is a physical force exerted between separate objects, which is due to neither charge, gravity, nor the exchange of particles, but instead is due to resonance of all-pervasive energy fields in the intervening space between the objects. This is sometimes described in terms of virtual particles interacting with the objects, due to the mathematical form of one possible way of calculating the strength of the effect. Since the strength of the force falls off rapidly with distance it is only measurable when the distance between the objects is extremely small. On a submicron scale, this force becomes so strong, that it becomes the dominant force between uncharged conductors.

[sebbysteiny]

Firstly, I know somebody was always going to say it, but gravity is not a force. It is just a natural product of 4 dimensional geometry of curved space time. But it does produce a 'phantom' force that does look like it is a force.

Also, what about the force of personality?

[KickAssClown]

I count six. Casmir, Van der Waal, Elecrtomagnetism, Gravity, Strong, and Weak.

[BrainForce]

Mighty five -
Casimir,electromagnetic,weak,strong nuclear force.
Gravity we take it as a fundamental force, but a new discovery anytime can cause a turnaround.

[Tormod]

Originally Posted by sebbysteiny

Firstly, I know somebody was always going to say it, but gravity is not a force. It is just a natural product of 4 dimensional geometry of curved space time.

Tell me - what causes 4D space to curve unless it is gravity?

Gravity is a natural product either which way you see it, why does that rule it out as a force? Are you perhaps implying that somehow the other forces are not natural...?