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The title of the original text: "my colleague of the wrong kind, must use chewing gum to help me open coconut."... "

A man bought a coconut.

When I got it to the office, I found that I forgot to ask the seller to help me cut it. At this time, a colleague rushed out with chewing gum in his hand: watch me!

There was nothing but a pit. After smashing the coconut into the crumpled chewing gum, there was a hole on the surface of the coconut, but that was it. After smashing several times in a row, the colleague began to peel with his bare hands and smashed the exposed coconut into the chewing gum:

Colleagues suspected that the thick coconut skin affected the performance of chewing gum, but the peeled coconut also flattened the chewing gum. In order to save face, my colleague was a little anxious: "the coconut can't be opened, so …"... shall I try to open a can of coconut milk? "

Nothing happened, so who came from the legend of "chewing gum opening coconuts"? Can soft gum really break a coconut?

After smashing down the coconut, the chewing gum flew away: it slipped away, and the third of its own shot depended on hard work. After seven minutes of hard work, we finally used chewing gum to produce coconuts. Here are our experimental reports and some unexpected tricks.

Experimental materials: 1 piece of coconut green 800g; 5 tablets of chewing gum.

The process of the experiment:

Squeeze 5 pieces of gum into a sharp cone, which takes 10 minutes.

Hold the cone gum, holding the coconut in hand, with the coconut tip up and flat bottom down.

Quickly smash the coconut into the gum.

Statement of Experimental Ethics:

The scheme has been approved by the Ethics Committee of the fruit shell editorial department (batch number: GUOKR42). The possibility of damage to the floor, chewing gum, coconut and the hands of the experimenter has been fully considered in the scheme design, and the experimental supplies (coconut milk) have been properly disposed of (shared food).

Experimental results:

Have a drink. After doing numerous failed experiments, we have summed up some experiences:

1. Choose the right piece of gum and slowly squeeze it into a cone (don't chew it in your mouth! ), use more tablets. We used a whole package of 5 slices, and the small cone may not be able to penetrate the coconut with only one piece.

two。 If you buy the white coconuts that are common in the supermarket, remember to hit the coconuts with their tips up and their buttocks down. Because the bottom of the coconut generally has three eyes, only one can be easily pierced, and that hole is used for coconut sprouting and long leaves.

A coconut without an outer layer, like this, can be opened with a slight poke in the round hole at the bottom. How can the small chewing gum shot by yourself be comparable to an electric drill?

Newton or not Newtonian gum, an object that is soft when soft and hard when hard, has a very advanced name: non-Newtonian fluid.

Non-Newtonian fluid is actually a concept relative to Newtonian fluid.

To put it simply, a fluid such as water, no matter what force you apply, it flows as usual. In other words, the "viscosity" of a Newtonian fluid is constant and is not affected by the force applied (but by temperature).

But the "fluidity" of chewing gum is affected by external forces: gently squeezing it to make it into a different shape, hard tapping to "safely do not move", this somewhat counterintuitive property is the performance of non-Newtonian fluid.

When you suddenly put a lot of pressure on the gum (hit it with a coconut), the gum quickly hardens and can penetrate the coconut shell.

There are actually a lot of non-Newtonian fluids in life, such as toothpaste and ketchup. Can they also open coconuts?

Hard and soft non-Newtonian fluids not only thicken but also dilute.

Chewing gum is one of the shear thickening fluids, such as starch solution and Slim toys.

On the other hand, ketchup can not be poured out, and a pile of ketchup can be thrown out with a force, which belongs to the shear thinning fluid. When you shake the ketchup bottle hard, the ketchup inside will "dilute" and rush out.

Canned ketchup is used to be difficult. | Gifer.com quicksand, like ketchup, is a shear thinning fluid. So if your legs are stuck in quicksand and it is difficult to pull them out, one way to save yourself is to try to shake one leg. If the quicksand becomes thinner, you can pull it out, and then pull out the other leg in the same way.

Toothpaste is more special and belongs to Bingham fluid. This fluid has a "critical value". When you force more than a certain value, it will change from a solid-like state to a "flow". Just like toothpaste, it won't flow if you don't squeeze it.

Non-Newtonian fluids are actually a large family, and not all non-bovine substances can be used to open coconuts. Shear thinning fluids such as ketchup will only become thinner by force.

But we really tried ketchup, and the soft ketchup couldn't even pile up small cones. Avoid turning the office into a murder scene (all the leaders want to thank me)!

An AI:

Well, we also tried to open coconuts with cornstarch (which is a shear thickening fluid like chewing gum), but...

The hard-pressed spire melts as soon as it is loosened. Who was the first to discover that chewing gum can be used to open coconuts?

This article comes from the official account of Wechat: fruit shell (ID:Guokr42), author: Owl, editor of small towels: Youyou

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