Quote:
Originally Posted by Iron Greasel
But you can observe those. You can either measure an electron's position or its momentum, but in either case you know it is there. You can see the force in the effect it has on an object; Toss a rock in the air and it will come back down. If something affects something else, you can observe it. If it does not, then it does not really exist for most purposes.
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Sorry but you cannot observe those (given they exist). You can observe an effect of a property of the so-called electron on an instrument. You don't observe the force on an object, you see only the rock, moving(accelerating). (I will add that according to General Relativity, gravity as a force does not exist!!)