Need help regarding time based animation

Ok, I trying to make an object fall when my character collides with it. I’m currently using frame by frame animation to make the object falls.

However, I got a problem when I ported by swf file to a machine with low processor because the falling animation slows down.

So i want to ask is it possible to make my object falls by time based(like within 1 sec) when my character touches it ?

If it’s possible, can someone teach me how ?

Thanks a million.