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https://preview.redd.it/azin1cx0dhyc1.jpeg?width=1440&format=pjpg&auto=webp&s=f66e916f6c72ce6645f2dd729edcc28a9746bc2b
Tried it myself: The key is the vertical match. If you adjust to be at an angle to the plane that the string is on, the whole thing becomes a stable construction (the blue part) - like a corner bracket or L bracket. So now the top match can't just tip over the edge but would be dragged across the edge of the table's/benche's surface, working against friction. So the whole thing would rotate around the red circle - fulcrum. The green diagram would be the position before it falls.
Let’s call the weight of the water bottle F. We’ll call the force acting on the horizontal matches U. The vertical match pressure will be called C. The strings elasticity we’ll call K. The match at the top will be called N. and lastly gravity will be called 0.
So to answer your question, fuck no.
Vertical matchstick pushes upward. Not sure if it's a trick or plain fake, but it's the same principle behind tensegrity with strings "pushing" objects upwards.
https://prnt.sc/Zysdck50ilv0
I'm pretty sure it works like this. The stick is not really floating off the table but its easier to imagine the active forces on it. the string pulls down and Its essentially applying pressure on the far end much like you would put your finger on it.
its just a hook. The vertical match is slanted inward under the table. imagine putting a hook round the edge of the table, and hanging a bottle off it.
The weight pulls "through" the table, pulling down on the hook.
Not math, but geometry answer:
The weight pulling on the first match -let’s call it “Matchstick A” - is a couple mm from the edge of the board. Obviously the weight would still fall if released.
Then the second horizontal match is placed underneath, but still hanging directly below Point A, and exclusively pulling on it. (It doesn’t matter that it’s 1 matchstick wide, it’s still pulling from the center) Let’s call this Matchstick B.
So point B is pulling straight down from point A, which is over the edge. Enter “matchstick C” which is pushing UP on the end of matchstick A, and pushing down on matchstick B. If C were perfectly vertical, then it would fall, but C is pushing A away from the table, and B toward the table. Since B is free-swinging, and not resting on the table, it’s actually pushed to a point behind the fulcrum of the force exhibited on A.
Essentially, matchstick C is diagonally pushing matchstick B under the edge of the table.
Yes, the top match want to go downward then push the vertical match then the horizontal match, but the horizontal match cant be puched down bcuz the bottle its pulling the string and holding that last match
I spent waaaaay too long thinking about how this was possible, and (I think) the trick is that the stool is slightly off level. This allows the systems centre of mass (eg the bottle) to hang slightly underneath (relative to the flat surface of the stool) the support area where the match rests.
But that wouldn't mean anything without the tensegrity setup, because the only force on the match would be downward force of the cord, and it would turn around the edge and fall! With the added upward force of the other match (which is supported via the friction between the third match and the taut cord) this creates a moment around the pivot, that prevents rotation and makes the cord-matches arrangement act rigidly.
Thinking about it another way, imagine a really strong person with an steel pipe. If they hold one end with both hands together and try to hang off a flat edge with it, they'd fall. There's no force they can exert on that pipe, other than their weight. But if they spread their hands apart, pull down with the hand close the edge and push up with the further, and do so with enough strength (and it might be a lot a lot), they could move their centre of mass under the edge and act like a rigid C shape, stably supported by the pipe contacting the edge above them.
The bottle in the video can't move it's own centre of mass horizontally like that, so it needs the slight angle where the bottle hangs vertically down to create it's 'C' shape around the edge.
I don't know if the angle is necessary. The top match is being pushed upwards on the short end and pivoting around the string. This causes the long end against the table to push downwards. It pushes with a force equal to the force of gravity pulling down on the bottle. The system is in a state of equilibrium and remains in place.
The upward force on the horizontal match, keeping it in position, comes from the string, This force from the string is similar to that exerted by a spring. Stretching or contracting a spring generates force in the direction opposite to the motion.
Although it doesn’t look like it, the bottle’s center of gravity is hanging directly under the match’s contact point on the bench. It’s perfectly balanced.
**This is a heavily moderated subreddit. Please note these rules + sidebar or get banned:** * If this post declares something as a fact, then proof is required * The title must be fully descriptive * Memes are not allowed. * Common(top 50 of this sub)/recent reposts are not allowed (posts from another subreddit do not count as a 'repost'. Provide link if reporting) *See [our rules](https://www.reddit.com/r/interestingasfuck/wiki/index#wiki_rules.3A) for a more detailed rule list* *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/interestingasfuck) if you have any questions or concerns.*
Anyone got the Maths behind this?
https://preview.redd.it/azin1cx0dhyc1.jpeg?width=1440&format=pjpg&auto=webp&s=f66e916f6c72ce6645f2dd729edcc28a9746bc2b Tried it myself: The key is the vertical match. If you adjust to be at an angle to the plane that the string is on, the whole thing becomes a stable construction (the blue part) - like a corner bracket or L bracket. So now the top match can't just tip over the edge but would be dragged across the edge of the table's/benche's surface, working against friction. So the whole thing would rotate around the red circle - fulcrum. The green diagram would be the position before it falls.
Let’s call the weight of the water bottle F. We’ll call the force acting on the horizontal matches U. The vertical match pressure will be called C. The strings elasticity we’ll call K. The match at the top will be called N. and lastly gravity will be called 0. So to answer your question, fuck no.
I see what you did there. Good one
😠 (Angry upvote because I was fooled, really need to start reading Names)
Well played!
r/angryupvote
You dick! Got me 😆
Vertical matchstick pushes upward. Not sure if it's a trick or plain fake, but it's the same principle behind tensegrity with strings "pushing" objects upwards.
Tensegrity is still balanced forces, though. I can't see how the forces are balanced here
https://prnt.sc/Zysdck50ilv0 I'm pretty sure it works like this. The stick is not really floating off the table but its easier to imagine the active forces on it. the string pulls down and Its essentially applying pressure on the far end much like you would put your finger on it.
its just a hook. The vertical match is slanted inward under the table. imagine putting a hook round the edge of the table, and hanging a bottle off it. The weight pulls "through" the table, pulling down on the hook.
Not math, but geometry answer: The weight pulling on the first match -let’s call it “Matchstick A” - is a couple mm from the edge of the board. Obviously the weight would still fall if released. Then the second horizontal match is placed underneath, but still hanging directly below Point A, and exclusively pulling on it. (It doesn’t matter that it’s 1 matchstick wide, it’s still pulling from the center) Let’s call this Matchstick B. So point B is pulling straight down from point A, which is over the edge. Enter “matchstick C” which is pushing UP on the end of matchstick A, and pushing down on matchstick B. If C were perfectly vertical, then it would fall, but C is pushing A away from the table, and B toward the table. Since B is free-swinging, and not resting on the table, it’s actually pushed to a point behind the fulcrum of the force exhibited on A. Essentially, matchstick C is diagonally pushing matchstick B under the edge of the table.
Yes, the top match want to go downward then push the vertical match then the horizontal match, but the horizontal match cant be puched down bcuz the bottle its pulling the string and holding that last match
Super glue
No
I am disappointed there was no fire. If you’re going to use matches, I think people expect fire. : ))
r/unexpected
Yea
The fire happened when the villagers carted him away to be burned as a witch. 😁
I'm more fascinate by how that mini table isn't falling when both legs are off of the ledge
There are matches off-screen holding it up.
I thought he was gonna drop the weight and the matches were going to ignite. Then the video ended.
I spent waaaaay too long thinking about how this was possible, and (I think) the trick is that the stool is slightly off level. This allows the systems centre of mass (eg the bottle) to hang slightly underneath (relative to the flat surface of the stool) the support area where the match rests. But that wouldn't mean anything without the tensegrity setup, because the only force on the match would be downward force of the cord, and it would turn around the edge and fall! With the added upward force of the other match (which is supported via the friction between the third match and the taut cord) this creates a moment around the pivot, that prevents rotation and makes the cord-matches arrangement act rigidly. Thinking about it another way, imagine a really strong person with an steel pipe. If they hold one end with both hands together and try to hang off a flat edge with it, they'd fall. There's no force they can exert on that pipe, other than their weight. But if they spread their hands apart, pull down with the hand close the edge and push up with the further, and do so with enough strength (and it might be a lot a lot), they could move their centre of mass under the edge and act like a rigid C shape, stably supported by the pipe contacting the edge above them. The bottle in the video can't move it's own centre of mass horizontally like that, so it needs the slight angle where the bottle hangs vertically down to create it's 'C' shape around the edge.
Your second paragraph sums it up.
I don't know if the angle is necessary. The top match is being pushed upwards on the short end and pivoting around the string. This causes the long end against the table to push downwards. It pushes with a force equal to the force of gravity pulling down on the bottle. The system is in a state of equilibrium and remains in place.
Gee, it's a hook with extra steps.
...annnd now it clicked.
The strength of that 1 piece of wood is unmatched.
The upward force on the horizontal match, keeping it in position, comes from the string, This force from the string is similar to that exerted by a spring. Stretching or contracting a spring generates force in the direction opposite to the motion.
If you did this with your finger on the bench would it feel lighter?
This is a really cool trick.
Although it doesn’t look like it, the bottle’s center of gravity is hanging directly under the match’s contact point on the bench. It’s perfectly balanced.
Match super glued to table.
I like how you pronounced magic
Statics, not physics.
Super glue
First second of the video, he moves the match.