- Aug 24, 2006
- Reaction score
- Albuquerque, New Mexico
That's the current view based on the current model. But what happens when their is another paradigm shift in physics? Just because certain mathematical absractions are useful for making predictions, it does not follow that such models describe the inner workings of physical bodies as they truly are. There is always a danger of making metaphysics out of mathematics.stanley123 said:??Papist said:No, all we know is that if we throw a ball up in the air, it will come back down according to the inverse square rule. We have no idea why.stanley123 said:Gravity is an attractive interaction between massive bodies. We know that it exists since if you throw a basketball up in the air, it will come back down.Papist said:...can you explain to me what a gravitational force is? We do not know that there are any such things. We only know that objects move in a uniform way according to the inverse square law. We come up with the idea of "forces" in order to explain that movement.
The modern post Einstein explanation for gravity is that it is curvature in space time caused by massive bodies. According to Newton, force is defined as Mass x acceleration, so even if you postulate that gravity is space time curvature, a basketball thrown up in the air will experience a force given by mg, where g is the acceleration due to gravity on the earth, excluding of course the lesser force of air resistance.