So in RE there are three separate types of physics? And FE is stupid?
I meant relativistic physics (large scale), Newtonian physics (small scale), and theoretical physics (subatomic scale) because all have different theories on everything.
They are different- yes. What makes them wrong? Newtonian physics is inaccurate only because it is a simplification of GR. Newton's formula are simplified leaving out unnecessary variables for relativistic circumstances. They correctly model the apparent force of gravity for 'normal' conditions, but GR applied to normal conditions would get the same result. GR is an improvement to Newtonian calculations, not a replacement.
Economics Example:
Where the function C(q) evaluates cost of manufacturing for q quantity of products produced:
C'(q) = MC(q)
*1Marginal Cost is The derivative times dx. dx = 1 by the definition of marginal ie incremental. Therefore it can be elimated from the equation. If dx were to change we would need to put it back into the equation.
Newtons' laws approximate the effects of gravity (not a force but an observed phenomenon) in standard conditions. GR is a much deeper understanding of these laws.