Originally Posted By: Bill
But you especially referenced a gravimeter that measured the acceleration of a mass in free fall. Stop trying to change the rules of the game in the middle.

There now we have what you don't get smile

It's the same thing .. try work out why ... there is only one way to formulate acceleration.

Hint: Try to find a reference point. Try the old drop big object and little object from a building. So the free falling mass gravimeter is going to read what when in free fall?

Edit: Didn't think but the video above has the astronauts on the ISS free falling. So they are your mass in free fall what acceleration are they showing?

Final Hint: Are Newtons laws (the laws our device is using to measure) valid in a non inertial frame.

Last edited by Orac; 01/06/16 03:27 AM.
I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.