lever

“General theory of practical method” Online Video Trailer 4

by Shopmaster on 2013/10/28

General theory of practical method: door hinge and the vertical axis. Lever and the pivoting point.  Presenter: Chen Zhonghua   Length: 17 min.   In: English   Year: 2013  Difficulty:1/5  At: Oakland, CA. USA

General theory of practical method
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The Use of Staff for Lever Practice i

by Practical Method on 2010/04/24

Three aspects are important.

  1. The stick/staff must be strong. If it bends, it can not bend in a way that energy stops.
  2. There must be a pivoting point. The pivoting point must not move.
  3. The level should be longer than the load.

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