# Dropping springs (in free fall) and hoberman ball

1. Dec 10, 2012

### katzzx

1. The problem statement, all variables and given/known data
A) Explain what will happen if I drop a spring at equilibrium.
B) Explain what will happen if I drop a Hoberman ball.
C) Explain what will happen if I drop the spring in a falling elevator (in free fall).

2. Relevant equations
T=kx

3. The attempt at a solution[/b
For A) The bottom of the spring will remain stationary until the top bit has touched it because extension x only changes then and consequently T becomes zero and the whole spring then falls together.
I'm not sure if this applies to the Hoberman ball question though. It may depend on whether the ball is expanded/contracted when I release it. If it's expanded, as I release it the ball no longer feels the tension so it will contract at once and fall as a small ball? If it's contracted in the first place, it won't expand and become larger as it falls, will it?
For C) will the effects be the same as in A??
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution