- #1

dyn

- 773

- 61

On the Earth , apparent gravity comes from the vector addition of the gravitational force directed towards the centre and the outward centrifugal force. It means that for a pendulum at rest , the direction the bob hangs downwards is not directly towards the centre of the Earth but there is a small deflection.

But what happens from the perspective of an observer in an inertial frame away from the Earth ? In an inertial frame there are no fictitious forces , so there is no centrifugal force. I presume the bob must also be slightly deflected in the same way ; but what causes this deflection ?

Thanks