Weather forecasting.

I stand on the earth. I'm held to the earth. I throw a ball up. the ball comes bak down. Something applied a forse on the ball to make it stop moving up, then start moving down.

Sounds like a forse to me.

In Euclidean Geometry, yes, a force is needed.

In GR, no, no force is needed.

I stand on the earth. I'm held to the earth. I throw a ball up. the ball comes bak down. Something applied a forse on the ball to make it stop moving up, then start moving down.

Sounds like a forse to me.

You believe yourself to be an inertial frame of reference, you are not.  Therefore, Newton's laws don't apply.

But the ball stopped, then reversed. An objekt in motion will... Sounds Newtonian to me.

But the ball stopped, then reversed. An objekt in motion will... Sounds Newtonian to me.

The ball's motion goes against the bending of spacetime when you throw it up.  It fights the curvature until it runs out of energy (at the highest point) at which point it follows the curvature back 'down' to Earth.  No 'gravity' force needed.

And what is the bent spase-time doing to the ball?

Space and time bend towards the mass of the Earth.

Movement through time is movement in spacetime.

The ball's movement in time as part of the bent spacetime draws it towards the Earth.

Sooo... The ball turns around bekause it is moving through spase and time?

Exactly, no force is needed, just the curvature of spacetime!  That's why gravity doesn't exist as a force in GR.

Then it's just a random event? The ball follows spase-time... Then turns around.

What is your reasoning for this?

No, the ball goes against the curvature of spacetime when you throw it.  The curvature of spacetime acts against the ball similarly as a force would.  The ball slows down (in space not spacetime), eventually stops(in space, not spacetime), and follows the curvature back to Earth.

Something applied a forse on the ball to make it stop moving up, then start moving down.

Or a forse on you.

But the ball stopped, then reversed. An objekt in motion will... Sounds Newtonian to me.

Except you are in a non inertial frame of reference, so objects will seem to disobey Newton, but as you believe you are in an inertial FoR, you introduce fake forces, as in 'gravity'.

No, the ball goes against the curvature of spacetime when you throw it.  The curvature of spacetime acts against the ball similarly as a force would.  The ball slows down (in space not spacetime), eventually stops(in space, not spacetime), and follows the curvature back to Earth.

But I thought something that akts on an objekt is a fose...