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Re: Stone Shifting

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OK, Guys, you seem to have been discussing the very topic that was concerning me. Being a physicist by training and a software developer by trade, I am writting a computer model for the falling block. It's not finished yet, but I have done enough to make some useful observations. The falling has 3 phases. Phase 1 is where the block pivots about the edge of the supporting tower. Phase 2 is where it begins to slip, but remains in contact. Phase 3 is where it (might) rotate sufficiently to break contact with the tower altogether.

The most critical factor seems to be the overhang of the centre of the block from the edge of the tower. If the overhang is small, the block falls very slowly at first, but builds up considerable rotational momentum and thus may totally overshoot the hole. If the overhang is large there is very little rotation so the block may not achieve an upright position. The "Sweet Spot" would be somewhere between these extremes where the rotation is sufficient to just bring the block to the upright position.

I am working on phase 2 at the moment so I need to find the coefficient of friction between wood and stone (may have to get my hands dirty). I don't know if phase 3 is every reached, but I will program it in just in case it's needed. It's fun to watch the model in action, the motion looks very natural. When it's finished I'll post a copy for you to download and try for yourselves.

Reply | with quote

Posted by Steve Gray
26th August 2003ce
00:01

(nigelswift, Aug 15, 2003, 09:24)

Re: Stone Shifting (ocifant, Aug 15, 2003, 09:42)
Re: Stone Shifting (pebblesfromheaven, Aug 15, 2003, 09:42)
- Re: Stone Shifting (pebblesfromheaven, Aug 15, 2003, 12:31)
  - Re: Stone Shifting (AtomicMutton, Aug 18, 2003, 14:16)
Re: Stone Shifting (jimit, Aug 15, 2003, 11:38)
Re: Stone Shifting (Moth, Aug 15, 2003, 12:01)
- Re: Stone Shifting (pebblesfromheaven, Aug 15, 2003, 12:07)
  - Re: Stone Shifting (IronMan, Aug 15, 2003, 12:13)
  - Re: Stone Shifting (ocifant, Aug 15, 2003, 12:13)
    - Re: Stone Shifting (nigelswift, Aug 15, 2003, 12:47)
      - Re: Stone Shifting (Moth, Aug 15, 2003, 15:10)
        Re: Stone Shifting (RiotGibbon, Aug 15, 2003, 15:13)
        Re: Stone Shifting (Moth, Aug 15, 2003, 15:34)
        Re: Stone Shifting (nigelswift, Aug 15, 2003, 17:38)
        Re: Stone Shifting (GordonP, Aug 15, 2003, 18:52)
        Re: Stone Shifting (nigelswift, Aug 15, 2003, 20:27)
        Re: Stone Shifting (GordonP, Aug 15, 2003, 20:58)
        Re: Stone Shifting (nigelswift, Aug 15, 2003, 22:04)
        Re: Stone Shifting (GordonP, Aug 15, 2003, 22:30)
        Re: Stone Shifting (baza, Aug 16, 2003, 04:25)
        Re: Stone Shifting (Moth, Aug 16, 2003, 01:50)
        Re: Stone Shifting (nigelswift, Aug 16, 2003, 08:48)
        Re: Stone Shifting (FourWinds, Aug 16, 2003, 09:05)
        Re: Stone Shifting (GordonP, Aug 16, 2003, 10:44)
        Re: Stone Shifting (nigelswift, Aug 16, 2003, 11:41)
        Re: Stone Shifting (GordonP, Aug 16, 2003, 17:18)
        Re: Stone Shifting (nigelswift, Aug 16, 2003, 18:12)
        Yay! (morfe, Aug 16, 2003, 18:21)
        Re: Yay! (GordonP, Aug 16, 2003, 18:37)
        Re: Yay! (morfe, Aug 16, 2003, 18:44)
        Re: Yay! (FourWinds, Aug 16, 2003, 18:58)
        Re: Yay! (GordonP, Aug 16, 2003, 18:58)
        Re: Yay! (morfe, Aug 16, 2003, 19:03)
        Re: Yay! (nigelswift, Aug 16, 2003, 19:09)
        Re: Yay! (morfe, Aug 16, 2003, 19:10)
        Re: Yay! (GordonP, Aug 16, 2003, 19:25)
        Re: Yay! (FourWinds, Aug 16, 2003, 19:33)
        Re: Yay! (GordonP, Aug 16, 2003, 20:38)
        Re: Yay? (Moth, Aug 16, 2003, 20:47)
        Re: Yay? (nigelswift, Aug 16, 2003, 21:22)
        Re: Yay? (GordonP, Aug 16, 2003, 21:34)
        Re: Yay! (ocifant, Aug 16, 2003, 22:02)
        Re: Yay! (ocifant, Aug 19, 2003, 20:41)
        Re: Yay! (konaman, Aug 16, 2003, 22:56)
        Re: Yay! (nigelswift, Aug 17, 2003, 14:34)
        Re: Yay! (GordonP, Aug 17, 2003, 16:42)
        Re: Yay! (nigelswift, Aug 18, 2003, 09:57)
        Re: Yay! (GordonP, Aug 18, 2003, 16:10)
        Re: Yay! (nigelswift, Aug 19, 2003, 09:16)
        Re: Yay! (GordonP, Aug 19, 2003, 11:40)
        Re: Yay! (nigelswift, Aug 19, 2003, 13:38)
        Re: Yay! (GordonP, Aug 19, 2003, 15:50)
        stones and people (morfe, Aug 19, 2003, 19:26)
        Re: stones and people (nigelswift, Aug 19, 2003, 20:58)
        Re: stones and people (TomBo, Aug 19, 2003, 21:06)
        Re: stones and people (nigelswift, Aug 19, 2003, 21:14)
        Re: stones and people (TomBo, Aug 19, 2003, 21:16)
        Re: stones and people (nigelswift, Aug 19, 2003, 21:17)
        Re: stones and people (TomBo, Aug 19, 2003, 21:20)
        Re: stones and people (Moth, Aug 19, 2003, 21:48)
        Re: stones and people (FourWinds, Aug 19, 2003, 21:17)
        Re: stones and people (nigelswift, Aug 19, 2003, 21:28)
        Re: stones and people (GordonP, Aug 19, 2003, 21:35)
        Re: stones and people (GordonP, Aug 19, 2003, 22:19)
        Re: stones and people (nigelswift, Aug 19, 2003, 22:51)
        Re: Stone Shifting (GordonP, Aug 20, 2003, 05:47)
        Re: Stone Shifting (nigelswift, Aug 20, 2003, 08:11)
Re: Stone Shifting (moey, Aug 20, 2003, 08:07)
- Re: Stone Shifting (nigelswift, Aug 20, 2003, 08:15)
- Re: Stone Shifting (GordonP, Aug 20, 2003, 08:44)
I want to move a mountain (grrr, Aug 21, 2003, 11:00)
- Re: I want to move a mountain (Moth, Aug 21, 2003, 11:03)
  - Oops... (Moth, Aug 21, 2003, 11:04)
    - Re: Oops... (nigelswift, Aug 21, 2003, 11:19)
      - Re: Oops... (grrr, Aug 21, 2003, 11:21)
        clarification (grrr, Aug 21, 2003, 11:23)
  - Re: I want to move a mountain (grrr, Aug 21, 2003, 11:20)
    - Re: I want to move a mountain (nigelswift, Aug 21, 2003, 11:54)
      - Re: I want to move a mountain (ocifant, Aug 21, 2003, 12:12)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 12:46)
        Re: I want to move a mountain (grrr, Aug 21, 2003, 13:04)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 13:11)
        Re: I want to move a mountain (grrr, Aug 21, 2003, 15:15)
        Re: I want to move a mountain (ocifant, Aug 21, 2003, 13:23)
        Re: TV possibilities (ocifant, Aug 21, 2003, 13:53)
        Re: I want to move a mountain (nigelswift, Aug 21, 2003, 14:21)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 17:56)
        Re: I want to move a mountain (grrr, Aug 21, 2003, 18:05)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 18:39)
        Re: I want to move a mountain (ocifant, Aug 21, 2003, 20:05)
        Re: I want to move a mountain (nigelswift, Aug 21, 2003, 20:31)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 20:40)
        Re: I want to move a mountain (nigelswift, Aug 21, 2003, 20:45)
        Re: I want to move a mountain (GordonP, Aug 21, 2003, 20:55)
        Re: I want to move a mountain (GordonP, Aug 22, 2003, 07:48)
        Re: I want to move a mountain (baza, Aug 22, 2003, 07:38)
        Re: I want to move a mountain (GordonP, Aug 22, 2003, 07:51)
        Re: I want to move a mountain (nigelswift, Aug 22, 2003, 08:18)
        Re: I want to move a mountain (GordonP, Aug 22, 2003, 09:02)
        Re: I want to move a mountain (nigelswift, Aug 22, 2003, 09:27)
        Re: I want to move a mountain (grrr, Aug 22, 2003, 10:00)
        Re: I want to move a mountain (nigelswift, Aug 22, 2003, 10:12)
        Re: I want to move a mountain (grrr, Aug 22, 2003, 10:37)
        Re: I want to move a mountain (Steve Gray, Aug 22, 2003, 15:01)
Re: Stone Shifting (GordonP, Aug 22, 2003, 10:40)
- Re: Stone Shifting (Steve Gray, Aug 22, 2003, 14:34)
  - Re: Stone Shifting (GordonP, Aug 22, 2003, 15:31)
    - funding (grrr, Aug 22, 2003, 16:20)
      - Re: funding (GordonP, Aug 22, 2003, 17:21)
    - Re: Stone Shifting (Steve Gray, Aug 22, 2003, 17:48)
      - Re: Stone Shifting (GordonP, Aug 22, 2003, 18:17)
        Re: Stone Shifting (Steve Gray, Aug 23, 2003, 00:41)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 05:13)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 05:41)
        Re: Stone Shifting (nigelswift, Aug 23, 2003, 06:29)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 06:58)
        Re: Stone Shifting (nigelswift, Aug 23, 2003, 07:21)
        Re: Stone Shifting (nigelswift, Aug 23, 2003, 08:17)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 09:05)
        Re: Stone Shifting (Steve Gray, Aug 23, 2003, 15:32)
        Re: Stone Shifting (Steve Gray, Aug 23, 2003, 15:38)
        Re: Stone Shifting (nigelswift, Aug 23, 2003, 16:12)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 16:40)
        Re: Stone Shifting (Steve Gray, Aug 23, 2003, 17:23)
        Re: Stone Shifting (GordonP, Aug 23, 2003, 18:18)
        Re: Stone Shifting (nigelswift, Aug 23, 2003, 18:29)
Re: Stone Shifting (Hob, Aug 23, 2003, 19:55)
Re: Stone Shifting (nigelswift, Aug 23, 2003, 23:00)
- Re: Stone Shifting (BrigantesNation, Aug 23, 2003, 23:51)
- Re: Stone Shifting (GordonP, Aug 24, 2003, 08:11)
  - Re: Stone Shifting (nigelswift, Aug 24, 2003, 09:32)
    - Re: Stone Shifting (Steve Gray, Aug 24, 2003, 12:31)
      - Re: Stone Shifting (GordonP, Aug 24, 2003, 12:53)
Re: Stone Shifting (GordonP, Aug 24, 2003, 10:28)
Re: Stone Shifting (nigelswift, Aug 24, 2003, 14:27)
- Re: Stone Shifting (Steve Gray, Aug 24, 2003, 23:39)
  - Re: Stone Shifting (nigelswift, Aug 25, 2003, 08:59)
    - Re: Stone Shifting (GordonP, Aug 25, 2003, 10:15)
      - Re: Stone Shifting (GordonP, Aug 25, 2003, 11:09)
        Re: Stone Shifting (nigelswift, Aug 25, 2003, 15:04)
        Re: Stone Shifting (GordonP, Aug 25, 2003, 15:50)
        Re: Stone Shifting (GordonP, Aug 25, 2003, 16:02)
        Re: Stone Shifting (nigelswift, Aug 25, 2003, 17:42)
        Re: Stone Shifting (GordonP, Aug 25, 2003, 18:20)
        Re: Stone Shifting (BlueGloves, Aug 25, 2003, 18:31)
        Re: Stone Shifting (Steve Gray, Aug 26, 2003, 00:01)
        Re: Stone Shifting (Steve Gray, Aug 26, 2003, 10:47)
        Re: Stone Shifting (nigelswift, Aug 26, 2003, 11:16)
        Re: Stone Shifting (jimit, Aug 26, 2003, 14:23)
        Re: Stone Shifting (Moth, Aug 26, 2003, 14:27)
        Re: Stone Shifting (jimit, Aug 26, 2003, 14:32)
        Re: Stone Shifting (ocifant, Aug 26, 2003, 14:39)
        Re: Stone Shifting (nigelswift, Aug 26, 2003, 15:14)
        Re: Stone Shifting (Moth, Aug 26, 2003, 15:18)
        Re: Stone Shifting (nigelswift, Aug 26, 2003, 15:48)
        Re: Stone Shifting (Moth, Aug 26, 2003, 15:59)
Continued in Stoneshifting 2 (nigelswift, Aug 26, 2003, 17:04)

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