faith based science?

everything except for space time is either an area over which a force acts or a manifestation of energy. If space time is neither of these then how could it be considered physical?

anti-fundamentalism: the anti traditional american, fake christian branch of weak atheism.Edited by foreveryoung, : No reason given.

But is physics studying merely a mathematical abstraction or something they can prove interacts with the world of matter and energy?

Acceleration and velocity are manifestations of energy. Momentum is a manifestation of mass or vice versa really. What is "space time" a manifestation of ?

But neither one exists without energy. It is energy that produces displacement over time and acceleration. Momentum is a meaningless concept without there being mass involved. It is the momentum of a particle that gives it it's mass. If a particle with no mass has a measure of momentum then you have either incorrectly defined momentum or mass or both. Velocity is one way that energy is applied so as to be able to be detected. Acceleration is another way. Gravitational force is a way that energy and matter are applied together so that they can be detected. To make something manifest is to make it detectable in a physical way.Edited by foreveryoung, : No reason given.Edited by foreveryoung, : No reason given.

That is unfounded speculation. On the other hand, it is proven that energy produces velocity and acceleration.

Please demonstrate how a wave can propagate without a medium.

A magnetic field and electric field exert force on particles. There is a distance between the source of the field and the particles. How do the magnetic and electrical sources exert a force an object that they are not in contact with? There has to be a medium in between them in order for one to exert a force on the other.

That is correct. You cannot form an electric or magnetic field without a medium. The medium is the vacuum of space. The difference between me and you is that I view the vacuum of space as having physical properties and is as much a medium as a wall of concrete, albeit much thinner. I have read some things by people you would consider quacks about the exact nature of the vacuum of space itself.

We don't observe any changes in the speed of light as long as it is going through the vacuum of space no matter where that might happen to be. The quality of the vacuum of space is everywhere constant even in the presence of massive bodies.