Space-time distortion and thoughts

[Newcomer]

First of all, this is my first post, sorry if I did something wrong. 

So according to the Einstein`s theory of gravity, gravity is caused by a distortion or curve in space-time, and the curve becomes the new route for the object, because its the straightest route.

Does the velocity of the object change? 

And if it does, what makes it accelerate?

Lets say that the things that have mass would be bigger in space-time. More mass, more space-time covered. In our measurements, the speed of the object would increase, because it covered more distance in the same time. In space-time however it would be the distance that increased. 

 

And what if light moved at the same speed regardless of the medium? Only that the more mass the medium had, the bigger distance the light had to travel in space-time? So it appears to be slower. 

 

 

I am not that educated so please go ahead and tell me if I'm wrong. I have a hunch that this may be wrong. Maybe it's the other way around, you tell me!

 

Edited July 14, 2018 by Newcomer
typos

[Warped]

Newcomer,

Velocity is defined as speed AND direction, if the direction or speed or both changes then the velocity is changed by definition. Also acceleration is a change of velocity, i.e. if either the speed or direction changes (the velocity changes) then acceleration occurs by definition.

Also, the term Einstein created is "spacetime"  - one word, rather than "space-time"

A couple of simplistic examples of Einsteinian Gravity I use:... You are walking on the sidewalk in your neighborhood and you see that the path ahead is blocked by bunch of garbage cans. So, you automatically change direction and go around the cans and proceed on in the direction you were going.  Or, you are traveling on a highway and it starts to go uphill, so you change direction and go uphill following the upward curve. So, as a mass encounters a "warp" in spacetime it changes velocity (or accelerates) to follow the curvature caused by the warp.

Sources: I use my cell phone since it is an on-line encyclopedia (Wikipedia). Also, the "Learning Company" has excellent video courses on the subject (www.thegreatcourses.com). For a deeper, more rigorous discussion on the topic, search "Einstein's Field equations"