Date: Mon Aug 31 12:02:34 2009 Back to Contents ------------------------------------------------------------------------

Author: John Mocko

Subject: Re: Bed of Nails -- RE: High speed video


Sorry, I don't mean to sound like I'm criticizing. I'm just trying to
explain why I do things differently. As for chunks hitting the legs of
hammer person.....I stand over the legs of the person laying on the nails
so the block chunks go perpendicular to both me and the person on the
nails if you align the block holes with the body. So from your video I'd
turn both the block and the hammer swinger 90 degrees. I also use the
8x8x8 half block because I can place it so a flat surface is both on the
bottom for it to sit on and on the top for the hammer to strike (no


On Mon, 31 Aug 2009, Matt Lowry wrote:

> Howdy all,
> In my defense, the two videos below were taken the very first time I
> ever did the demonstration. I have since learned - hence the face
> shield, which has saved me many times, and a crotch shield, which
> doesn't show up well in the high speed video.
> The reason why I don't turn the block 90 degrees (horizontally) is
> because from the structure of the block this increases the chances
> that you won't hit it square in the middle. This in turn increases
> the chances that the block won't break - trust me, I've learned this
> the hard way. This also puts the hammer wielder in danger, as chunks
> fly back towards their shins & feet.
> As for not laying the block down on its long side, same problem with
> hitting it correctly. Because of the middle cross-piece of the block,
> this makes it a poor position in which to hit it.
> Perhaps you guys use differently shaped blocks than I do? That would
> explain a lot of things.
> Cheers - Matt


John Mocko
Senior Teaching Laboratory Specialist (Lecture Demonstrations)
Department of Physics
University of Florida
Gainesville, Fl.

From Mon Aug 31 12:02:34 2009