Is there a universal gravitational constant? Is the force of gravity fixed?
Current scientific understanding would say that the universal gravitation constant is fixed, but there are some theories that require it to be variable (we don’t know everything, yet…). Feynman was referring to the warping of spacetime by massive objects (what we perceive as gravity), he just means that it isn’t a force in the sense of a spring pulling on a mass kind of force, but more like the force that pulls outward on a rotating object (centripetal force, also a “pseudo force”). Really, a pseudo force just means that it depends on your frame of reference. If you are in free fall you don’t feel the gravity of a nearby massive object (i.e. things in orbit feel the earths gravity just as much as anything else, but it doesn’t seem like it cause there isn’t anything to push against). Just like rotating objects don’t actually have anything pulling outward, but in order to rotate something must be pulling inward and the reaction to that is what feels like an outward force. If you spin o
