According to Sir Isaac, force is rate of change of momentum. An abrupt stop generates very large forces, which is why cars are designed with crumple zones these days. We need considerably less force to stop the stone if we change the momentum more slowly. Stopping it in say 1/10th of a second instead of say 1/100th second will reduce the force by a factor of 10. We could do this by binding something spongy onto the part of the block that will impact with the edge of the hole. A bunch of plaited rope (like they have on the front of tug boats for just the same reason) might be an authentic choice.
 Reply | with quote | Posted by Steve Gray
31st August 2003ce
14:58 |
Stone Shifting 2 (nigelswift, Aug 26, 2003, 17:00)- Re: Stone Shifting 2 (Jane, Aug 26, 2003, 17:16)
- Re: Stone Shifting 2 (Steve Gray, Aug 26, 2003, 17:46)
- Re: Stone Shifting 2 (GordonP, Aug 26, 2003, 20:44)
- Re: Stone Shifting 2 (FourWinds, Aug 27, 2003, 11:24)
- Re: Stone Shifting 2 (nigelswift, Aug 29, 2003, 09:10)
- Steve's idea to fix a pivot log under the stone (nigelswift, Aug 30, 2003, 08:24)
- Which Method? (nigelswift, Aug 31, 2003, 07:09)
- Pi in the sky (baza, Aug 31, 2003, 17:44)
- Re: Stone Shifting 2 (jimit, Sep 01, 2003, 19:39)
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Head To Head 
Re: Which Method? (Steve Gray)