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That's a good solution as well. It might be harder to make the descent
*really* slow, though, as is possible with a clock-style pendulum.
--
Paul Davidson, aka Tinman
www.theforce.net | Your Daily Dose of Star Wars
www.filmforce.net | Your Daily Dose of Film News
Opens everywhere, January 2000
Ralph Hempel <rhempel@bmts.com> wrote in message
news:000001bf3c1e$4686fb80$0500000a@pro150...
> If you want to vary the rate at which an object of constant
> weight moves, why not use a mechanism like an old postal
> scale. No, not the kind that shoots you when you look at it sideways...
>
> It involves a pendulum mounted so that when the object is at one end
> of its travel, the pendulum hangs down. As the platform moves, the
> pendulum is lifted and the resisitance it provides is proportional to
> the sin (sine) of the change in angle.
>
> Try it yourself with a brick. Hold the brick and let your arm
> dangle. Now move your arm in an arc. The first few degrees are
> pretty easy, but as you move closer to 90 (horizontal) the
> "weight" - really the effort - to move your arm is larger.
>
> Does this help?
>
> Cheers,
>
> Ralph Hempel - P.Eng
>
> --------------------------------------------------------
> Check out pbFORTH for LEGO Mindstorms at:
> <http://www.hempeldesigngroup.com/lego/pbFORTH>
> --------------------------------------------------------
> Reply to: rhempel at bmts dot com
> --------------------------------------------------------
>
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