Upload

Loading icon Loading...

This video is unavailable.

Bed of Nails

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to like Harvard Natural Sciences Lecture Demonstrations's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to dislike Harvard Natural Sciences Lecture Demonstrations's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to add Harvard Natural Sciences Lecture Demonstrations's video to your playlist.

Uploaded on Aug 19, 2010

A 2 cm (3/4") thick, 45 cm by 75 cm (1.5' × 2.5') plywood board has approximately 1,000 16-penny nails pounded into it so that they extend through the board. The nails are spaced about 2 cm apart. A similar board, but with twice the thickness (actually, just two boards together) of wood, is used for the top of the sandwich. One or two thick books (preferably physics books) serve as a pillow under the head.

The forces (weight of the body, cinder block, etc.) are distributed over the total area of all the nail points so that the pressure is not high enough for the nails to puncture the skin. Of course we know what would happen if one were to lie on just one nail! In this case, the pressure is extremely high because the area of just one nail point is quite small.

For more details on our setup see http://sciencedemonstrations.fas.harv...

Special thanks to Rob and Nils.

  • Category

  • License

    Standard YouTube License

Loading icon Loading...

Loading icon Loading...

Loading icon Loading...

Loading icon Loading...

Ratings have been disabled for this video.
Rating is available when the video has been rented.
This feature is not available right now. Please try again later.

Loading icon Loading...

Loading...
Working...
to add this to Watch Later

Add to