Dale's latest activity

That depends. If the force is proportional to the mass, ##F_2 = g m_2##, and if ##F_1=g m_1 + …## then you have a good accelerometer...

Not if you define it as invariant mass times proper acceleration--which is how relativity defines it. Both of those are invariants.

I don't agree. What an accelerometer measures is not theory dependent. Newtonian gravity agrees that an accelerometer attached to a body...

I haven’t studied such theories, so I am not able to answer this. I am sure there is some scientific literature on the topic, but I...

Yes, that is what I mean. I will point out that we are having this conversation in the Special and General Relativity subforum, so...

Why not? It just means that you have to redesign your accelerometer. In any case, it doesn’t change the fact that the gravitational...

The electromagnetic force on an otherwise isolated charge can be measured with an accelerometer. This measurement is frame-independent...

Except that the electric force cannot be always locally transformed away by a frame change, because it's not proportional to mass like...

Spacetime curvature is not an interaction, but a property of spacetime. And it's related to tidal gravity, not gravity itself, which can...

That is reasonable. However, any quantity that is inferred from motion is relative to the reference frame that defines the motion. Its...

That doesn’t measure the gravitational force, even in Newtonian physics. In the ISS the Newtonian gravitational force is almost the same...

Where did Einstein say this? Since many things were measured prior to the development of the corresponding theory, that seems like a...

An accelerometer on the surface of the Earth measures the upwards proper acceleration due to the upward support force, not the downward...

No, you can measure the upwards force on the suspension point of your spring exerted by the floor. That you cannot separate this into a...

Yes. But in GR you should add the word “local”. Locally gravity disappears because in a local inertial frame the inertial force...