Re: Pendulum mechanics

Michael Lorrey (
Fri, 18 Jul 1997 22:26:57 -0400

Damien Broderick wrote:
> At 08:13 PM 7/17/97 -0400, Mike Lorrey of spacedrive fame wrote:
> >How can a little kid (or an adult for that matter) sit on a perfectly
> >still playground swing, begin rocking back and forth, and within a
> >minute be wizzing back and forth to a pretty good height, without ever
> >touching the ground or other still grounded object?
> Michael, Michael! It's connected at the top. (Unlike the spaceship.)

That doesn't mean anything. As a pivot point it is merely a fulcrum if
reaction mass is expended, according to Newton's Third Law. Since the
rider on the swing is at a standstill, and has no way to push against
anything, how do they develop the significant levels of momentum they

			Michael Lorrey
------------------------------------------------------------		Inventor of the Lorrey Drive

Mikey's Animatronic Factory My Own Nuclear Espionage Agency (MONEA) MIKEYMAS(tm): The New Internet Holiday Transhumans of New Hampshire (>HNH) ------------------------------------------------------------ #!/usr/local/bin/perl-0777---export-a-crypto-system-sig-RC4-3-lines-PERL @k=unpack('C*',pack('H*',shift));for(@t=@s=0..255){$y=($k[$_%@k]+$s[$x=$_ ]+$y)%256;&S}$x=$y=0;for(unpack('C*',<>)){$x++;$y=($s[$x%=256]+$y)%256; &S;print pack(C,$_^=$s[($s[$x]+$s[$y])%256])}sub S{@s[$x,$y]=@s[$y,$x]}