What is this???

Feb 4, 2009
35,862
17,403
136
Okay smart guys what’s happening here to allow this?
My amateur guess:
March on bottom is pushing up per the video, middle match is forcing table end of top match to push down which has enough friction to keep it in place.
Or am I completely wrong?


Creators explication is vague.
 

lxskllr

No Lifer
Nov 30, 2004
59,839
10,333
126
I'm guessing your use of the word "friction" is a mistype. I think it's just equalizing the forces so everything stays in place. If the downward force is counteracted by an upward force, nothing moves. I'm not smart enough to provide formulas.
 
Feb 4, 2009
35,862
17,403
136
I'm guessing your use of the word "friction" is a mistype. I think it's just equalizing the forces so everything stays in place. If the downward force is counteracted by an upward force, nothing moves. I'm not smart enough to provide formulas.
Not a mistype but yeah that was my point.
 

IronWing

No Lifer
Jul 20, 2001
72,669
33,536
136
Also note the position of the string on the upper match. There is a leverage advantage to the supporting match to help keep things stable.
 

dank69

Lifer
Oct 6, 2009
37,260
32,821
136
Match on bottom is not pushing up. It is just held firmly in place by the strap so it does not move down.
 

dullard

Elite Member
May 21, 2001
25,989
4,598
126
Hard to see from the angle of the camera, but it looks like the bottle is tied in a way that the bulk of the mass is actually under the table. Meaning that it should be stable because the table can support weight that is underneath itself. Remove all the "bells and whistles" that just serve to confuse the viewer and put the bottle on top of the table. As long as the center of mass is above the table, it will support it. As soon as the center of mass is off the table, it will fall.

Notice how he gives it a push along the direction of the table edge, keeping the center of gravity underneath the table. He does not push the bottle out from underneath the table which would move the center of gravity to a point that is no longer underneath the table (unstable).

All the match needs to do is to resist the minor torque that is being created (and he minimizes that torque by putting the string as close to the table edge as possible). The two additional matches probably help resist this torque.

Also note that he doesn't use the rounded plastic table top. Instead he put a sharp edged wood table on top of the other table. I wonder if this helps pinch into the match, resisting the torque a bit better. But that is just speculation without really looking in closely.
 
Feb 4, 2009
35,862
17,403
136
Hard to see from the angle of the camera, but it looks like the bottle is tied in a way that the bulk of the mass is actually under the table. Meaning that it should be stable because the table can support weight that is underneath itself. Remove all the "bells and whistles" that just serve to confuse the viewer and put the bottle on top of the table. As long as the center of mass is above the table, it will support it. As soon as the center of mass is off the table, it will fall.

Notice how he gives it a push along the direction of the table edge, keeping the center of gravity underneath the table. He does not push the bottle out from underneath the table which would move the center of gravity to a point that is no longer underneath the table (unstable).

All the match needs to do is to resist the minor torque that is being created (and he minimizes that torque by putting the string as close to the table edge as possible). The two additional matches probably help resist this torque.

Also note that he doesn't use the rounded plastic table top. Instead he put a sharp edged wood table on top of the other table. I wonder if this helps pinch into the match, resisting the torque a bit better. But that is just speculation without really looking in closely.
Here’s another and it is shown plus explained slightly better.

 
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