Re: Levers increase force?

On Tue, 22 Dec 2009, Peter wrote:

On Dec 22, 8:39 pm, Sam Wormley <sworml...@xxxxxxxxx> wrote:
On 12/22/09 6:59 PM, Peter wrote:

On Dec 22, 6:53 pm, Sam Wormley<sworml...@xxxxxxxxx>  wrote:
On 12/22/09 4:57 PM, Peter wrote:

Force F = ma; the force that gives a mass m an accelerations a, and
the force that gives a mass 1000m an acceleration a/1000, are equal,
because ma = 1000m(a/1000)l, no?

    Did you look over:
     http://hyperphysics.phy-astr.gsu.edu/HBASE/Mechanics/lever.html

Yes, I did. It seems they have it wrong there.

   Can you articulate the section that is wrong, for my benefit?
   Thanks.
"With a lever, one can obtain a multiplication of force,"
That is not correct.

Take a stick (a 1 metre ruler will do fine), and two spring scales, and
try it for yourself. Or a plank and 3 identical cans of beans.

--
Timo
.

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