I have 2 types of poster board that are both 1/32 inch thick shiny white on one side and is 2 ply and easy to tear by hand. The other is harder to tear by hand not sure how many plys. Tear test by hand includes with or against the grain. Would the poster board sheet thats harder to tear by hand...
The electromagnets have a 1,000 pound holding power and are round 3" purpose built electromagnets. Could they be used to provide strong rotary motion by pushing a permanent magnet?