(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A particle of mass M is hanging from one end of a massless spring, while the other is attached to the ceiling of an elevator.

The elevator then starts to move upwards at an acceleration equal to g/5.

Which way does the equilibrium shift, and what is the magnitude of the shift?

2. Relevant equations

F=-kx, F=ma

3. The attempt at a solution

Equilibrium when not moving...

F=-kx=mg, so x=-(mg/k)

When moving...

F=-kx=m(g+(g/5))

x= -(mg/k) - (mg/5k)

Where the magnitude of the shift is -(mg/5k), and the equilibrium would shift downwards.

Is this correct? Im a bit confused because i though x was displacement from equilibrium.

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# Homework Help: Non-intertial frame problem

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