Gravitational Force on a Body: Is it Absolute?

[skanda9051]

Can we consider gravitational force acting on a body considered as absolute force:-) if so pleas explain

 

[cmb]

Please define your meaning of 'absolute force'.

 

[K^2]

In GR, accelerations are absolute, so any force can be measured absolutely, including fictitious forces, such as gravity.

 

[PAllen]

In GR, accelerations are absolute, so any force can be measured absolutely, including fictitious forces, such as gravity.

Can you explain more? I agree with the first part. To me, that means, in GR, there is no such thing as fictitious forces, and gravity is not a force at all. Any proper acceleration is due to a real, non-gravitational source (EM, etc), reflecting deviation from inertial motion, latter determined by stress/energy=curvature.

 

[Dale]

In GR, accelerations are absolute, so any force can be measured absolutely, including fictitious forces, such as gravity.

The kind of acceleration which is absolute is called proper acceleration. Coordinate acceleration is not absolute, and fictitious forces produce coordinate acceleration, not proper acceleration.

 

[K^2]

Ugh. Don't know what I was thinking. Disregard my previous post.