Subject:
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Re: lego clock
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 13 Nov 2001 11:02:16 GMT
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Viewed:
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557 times
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In lugnet.technic, Chris Daniel writes:
> A pendulem completes a cycle as it moves from one extreme position to the
> other and then back. Does anyone know a formula, or approximatly how long a
> 2 second cycle pendulem would need to be? Thanks
It's a bit difficult to convey this maths in straight text but I'll have a go:
The formula for the period of a pendulum is:
T = 2 * pi * Square root (L/g)
where g is the acceleration due to gravity (9.81 metres per second squared) so:
2s (your desired period) = 2 * pi * Sq Root (L/9.81)
solves to L = 9.81 * (1/pi)squared
which is .9939 metres (call it a metre) - maybe a little long for a Lego clock?
In case it helps at all there was a design for a technic clock in the 8888
Ideas book. Here's the link - it's on pages 70 to 73.
http://www.brickshelf.com/scans/8000/8888/
Best of luck with it
Simon
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Message is in Reply To:
 | | lego clock
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| A pendulem completes a cycle as it moves from one extreme position to the other and then back. Does anyone know a formula, or approximatly how long a 2 second cycle pendulem would need to be? Thanks (23 years ago, 13-Nov-01, to lugnet.technic)
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