Matter, energy, space, time and gravity

[Dremmer]

Are these five different things or are they just variations or properties of the same thing?

 

[mfb]

They are different things (which is the reason why they have different names).
Their interaction is the topic of physics.

 

[Dremmer]

Matter is the only one of these that we can perceive directly. We cannot perceive energy, gravity, space or time directly.

 

[bahamagreen]

We do not perceive matter directly, we perceive nothing directly.

 

[manojr]

Mathematical model that combines space and time is Spacetime that curves (gravity) in presence of matter (mass/energy).