Prática de Shadowing: I Tested the Deadliest Ancient Weapons - Aprenda a falar inglês com o YouTube
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Can a 10,000 year old weapon generate more destructive energy than a modern firearm?
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Can a 10,000 year old weapon generate more destructive energy than a modern firearm?
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And what about a 700,000 year old knife?
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Can that be as sharp as a razor sharp steel blade?
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This hot stuff I think about being your average unemployed friend on a Tuesday morning.
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Nonetheless, I wanna find out.
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So I'm gonna test three weapons that get progressively older and measure how effective and powerful they are.
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And the first one is the sling.
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These things are fascinating.
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You can kill giants with it.
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Allegedly.
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And so I want to find out how it works,
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what kind of energy generates,
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and then test the damage against the few targets.
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A sling is one of the oldest known projectile weapons,
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and Sumerian, Greek and Roman armies all had specialized slingers.
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So what do you do for a living?
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Why just throw little rocks at people?
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It's pretty fun.
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Anyway, a sling is basically a pouch attached to two cords and the projectiles you load into the pouch can be stones,
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lead bullets, which are actually pretty nice because they spin in the air,
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stabilizing the shot, soda cans,
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tape, All right, let's test it.
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To shoot I gotta place the loop on one end of the sling in the middle of the middle finger,
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load the projectile and hold the other end of the sling.
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Now there are many techniques you can use to shoot a sling based on the position of your arm
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and I'm not great at any of them.
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It takes a lot of practice especially to get accurate with it.
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And since I used one just once before I'm basically just improvising.
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But then after practicing for a while I'm now starting to get the timing down.
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And even though this camera angle doesn't give you the idea of how fast the rocks are actually flying,
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it's pretty clear that the energy generates.
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Well it's a lot!
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To measure it I place two sticks 1.3 meters apart from each other's
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and by shooting a projectile in between them
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and filming in slow motion I can find the velocity of the projectile and also the energy from there.
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First I'm throwing a 107 grams rock by hand
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and following my calculations the rock is flying at about 23 meters a second carrying an energy of 27.7 Joules.
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Then I throw a similar sized rock,
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but this time using the sling.
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With that I get a speed of about 32 meters a second with an energy of 60.1 Joules.
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That's more than double the energy I got by just throwing the rock by hand.
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Now the reason why a sling is able to generate
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so much more power compared to just throwing a rock is because of centripetal force.
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When you swing a sling,
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the tension in the cords and the speed of rotation generate kinetic energy
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and when the sling is released all this energy is transferred to the projectile, increasing the speed.
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Moreover, since the sling basically becomes an extension of your arm,
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it also gives you a mechanical advantage,
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and that's why longer slings are generally more powerful than the short ones.
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Lastly, I tried another test with a much heavier rock,
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and the sling still managed to throw the rock at about 24 meters a second,
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which converts to 95 juice.
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For comparison, that's almost 20% more energy than what I could get with the lethal slingshot I built a while ago.
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And I believe that with a better technique and aerodynamic projectiles,
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it could probably get into small firearm territory.
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Now, what happens when you hit stuff with it?
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I started with a watermelon and of course I missed a bunch of times.
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Damaged the sawhorse, which I actually find quite impressive,
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But after a few more tries, I got it.
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Can this kill giants though?
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Well I couldn't find any giant willing to test that.
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Come on man, I'm sure you'll be fine.
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But I found this one.
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This is a ballistic dummy,
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so the gelatin should simulate muscle tissue and the bones...
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bones.
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In short, the damage on this thing should be a pretty accurate representation of what would happen to someone
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if they got hit by a sling.
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First, I need to hear it though.
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Spoiler, it's gonna take a while,
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so I'm gonna just skip this process for you and while I throw rocks at nothing for the next few hours,
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I wanna shout out this plate for supporting this video.
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three in the shop for a while and I think they still look great
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and so I got a few ones for my house too.
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I love watching movies so this time they're basically all about that.
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The first one is from Lord of the Rings.
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For me one of the coolest shots in movie history.
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The second one is A Dark Knight.
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I posted a picture of Harvey Dent in one of my previous videos and nobody got the reference.
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You gotta watch it, it's a masterpiece.
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And then the last one is from Dune,
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one of my favorite movies in recent years.
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The posters feel sturdy and the clarity on the images is really good.
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Displate also recently launched this new product called Displate Textra,
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which gives extra clarity to the images by having a sort of 3D texture on the posters.
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Hanging the posters is also super intuitive and you find everything you need to do it inside the box.
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You just stick the protective leaf,
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stick the magnet to the leaf and hang the displate.
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And this way you can also adjust it or move it however you like it.
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My shop has pre-roof was,
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but the posters are still hanging there so I guess it works.
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There are millions of artworks available in the Displate catalog
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that you can pick from original art or licensed designs such as Marvel,
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Star Wars or Elden Ring.
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You can get them right now by going to displate.com slash MikeShake
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or use my promo code MikeShake to get a really nice discount.
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It's 22% off if you get two displates and 30% off if you get three or more.
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And I'm also leaving a link in the description if you want to check them out at the end of the video.
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Anyways, after 40 minutes I hit the first shot.
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And at first I thought I did nothing to the dummy,
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but then I checked the slow motion footage.
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My goal is obviously to hit the skull.
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But I feel like this shot is kind of impressive already.
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The dam is pretty heavy and the rock not only flipped it 90 degrees,
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but it also left deep cuts into the gelatin.
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And so I kept trying.
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In all that, I'm not sure if you can hear it,
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but there is a sort of crack when I let the sling go.
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And that is coming from the sling,
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traveling faster than the speed of sound.
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It turns out a sling basically works like a whip.
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When the sling is released the kinetic energy built up during the swing is transferred down the length of the sling.
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The transfer of energy increases in speed as it moves along the sling,
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accelerating the tip of the sling,
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called cracker, till it flies faster than the speed of sound.
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Now the purpose of having a cracker is to dissipate the energy and slow the sling down,
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so it basically doesn't come back whipping you every time you shoot.
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Anyways, the more I'm using it,
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the more I'm becoming a fan of this thing.
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As you can see, even if I still don't know what I'm doing,
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it's pretty insane to me what a simple piece of rope can do.
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And after about one hour I finally managed to hit the skull.
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Oh, it cracked it!
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The rock still had a lot of energy left though,
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and so I shot one more time.
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And this time I got it clean.
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Breaking the bones and cutting the gelatin once again.
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For the next weapon we're gonna go back about 10,000 years.
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I'm talking about spear throwers.
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I found one in carbon fiber,
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but before checking it out I'm mounting the spear,
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which kinda looks more like a long arrow than a spear.
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It got feathers, a pointy tip on one end,
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and a slot on the other end.
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While the spear thrower has this sort of pin that locks into the slot of the spear,
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basically like this.
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I'm very curious to test this but I probably shouldn't do it in my shop.
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So then I went outside.
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You know it's actually quite easy to use, I wasn't expecting it.
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After just a few throws I was already hitting the targets.
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History says this was actually a big step in human evolution because before using this we were just throwing spears by hand.
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A spear thrower works by extending the length of the thrower's arm providing leverage
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that significantly increases the velocity and accuracy of the spears.
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So compared to just using our arms,
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it allowed us to increase the reach,
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hunt larger game, and also be more accurate.
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Or at least that's the theory.
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So let's test that.
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I'm gonna throw one spear by hand and one using this,
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and we're gonna see the difference.
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I hope you can see me.
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Test one, range.
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First shot using my hands.
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Alright, now the spear thrower.
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oh my I got 22 meters by hand
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and 48 meters with a spear thrower you probably didn't even
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see where he landed I'm gonna give you a better angle oh
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that went further away than the last time so
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when it comes to range a spear thrower is definitely a
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big step up 64 right now one of the s penetration
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and damage and well you already know this guy it's just not in great shape right now
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so I'm gonna just use the back of the head shot one using my hands I don't even know
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if I can hit it to be honest nope well after a while I actually hit it though
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I think I got it.
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But the spear did basically nothing to the skull.
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So then I got a little bit closer and I hit it.
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Oh, nice.
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This would have hurt.
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What is happening?
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Anyways, the spear got actually quite deep.
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All right, spear thrower.
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Shot one.
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Jeez, that's definitely different.
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Same exact spot by the way and the penetration was certainly higher than before.
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I also tried to hit the skull,
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it took me a while and I broke a few spears in the process
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but interestingly when I hit it the spear snapped bouncing back towards me a little too fast for comfort
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and most importantly it didn't do significant damage to the skull,
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just a little dent.
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Still though, I find this quite fascinating and very very fun to use.
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It's nice.
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The third weapon I want to test is the oldest one of the list and it's Obsidian.
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Google says it's many times sharper than the sharpest steel blades,
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so I want to test that.
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I got a machine that measures exactly that.
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The plan is to compare Obsidian to three different steel blades,
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a utility razor blade, a shaving blade and a chef's knife.
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I'm gonna sharpen myself.
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As a reference a high-hand kitchen knife should be around 300 on the scale and the utility razor blade scored 235,
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while a shaving razor is one of the sharpest blades you can purchase.
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And with that I got a nice 35,
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also proving that the method I'm using is pretty accurate.
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And now it's time for the chef's knife.
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This is an old knife I bought from Ikea and it's pretty dull,
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so I'm spending a while sharpening it with two different whetstones,
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from a medium grit to basically a polishing one,
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which is so fine that it doesn't even make a noise when I swipe the knife on it.
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It took me about 10 minutes to do it and right now this thing should be very sharp.
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So now, as I did with the previous blades,
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I'm measuring the actual sharpness.
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I wanna double check that, so I'm trying again.
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50. Alright, I think I enjoy sharpening stuff a little too much.
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I'm not sure why.
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Anyways, these are all the results I got with the steel blades.
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Now it's time to test obsidian.
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Actually though, what even is obsidian?
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It turns out it's a type of glass that forms when lava cools down rapidly,
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usually when it comes into contact with water or air.
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This rapid cooling prevents the formation of crystals,
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and in short, that's basically why it looks like that.
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It feels like a chunk of glass,
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and like glass, it's brittle.
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So, To make an eye fire off obsidian,
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I need to start from a larger block and slowly remove material.
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The problem is that all the videos I watched see the same thing.
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You need to make sure to strike the obsidian in the right areas with the correct amount of force.
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And if you are like me and you're using a mouse pad to protect your leg and a hammer to strike obsidian,
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that sentence doesn't make any sense.
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I'm still trying to do that though,
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hitting the right parts with the correct amount of force,
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which in practice turned to hitting random parts with random amount of force
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and after 20 minutes I started to get kind of frustrated.
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Every time I felt I was kind of getting closer then the stones randomly snapped.
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I really thought I was gonna make this work
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but after one hour the only thing I did was turning
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big obsidian rocks into smaller obsidian rocks like a lot of them.
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I even tried grinding it.
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It didn't work.
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Massive respect for all the craftsmen making obsidian blades and all the Neanderthal men out there.
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I seriously underestimated this thing and now that I had no more obsidian to make a knife I thought about buying one.
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The problem is that I couldn't find any store in Europe
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that could ship an obsidian knife in time besides this website that says obsidian scalpels and then it hit me.
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Not the scalpel, but a realization.
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Even though it would be cool to have one of these big obsidian knives are not even
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that sharp because they're pretty thick.
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That is sharp obsidian flakes and luckily I got a lot of them.
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As a reminder these are the results I got with the steel blades
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and now I'm gonna test this which is obviously pretty sharp
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but when I tried to measure it I only got 90
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so then I got the thinnest flake I could find but
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when I measured the sharpness I got a score even higher than before,
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probably because the edge wasn't very clean.
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Then I tried with different flakes with a cleaner edge and things went definitely better.
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Obsidian is very sharp but during my test at least I never managed to get results
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that are 10 times sharper than razor blades or my IKEA knife.
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Even when cutting paper you feel more resistance compared to the steel blades.
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Still though, it's pretty cool and I'd like to make a knife out of this one day.
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Next I'm gonna make a very special sword and then I'm gonna finally test my supersonic nerf blaster.
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So if you like this video,
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leave a like and subscribe to see when they'll come out.
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Thank you for watching!
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Contexto & Antecedentes
No vídeo "Eu Testei as Armas Antigas Mais Mortais", o apresentador explora armas ancestrais, questionando se elas podem ser tão eficazes quanto as armas modernas. Em uma abordagem descontraída e curiosa, ele experimenta uma funda, um dos projéteis mais antigos conhecidos, e discute os mecanismos de funcionamento e a energia gerada por essa arma. Este é um conteúdo não só intrigante para os aficionados por história e armas, mas também uma ótima oportunidade para praticar a conversação em inglês, usando palavras e expressões do cotidiano relacionadas ao tema.
As 5 Principais Frases para Comunicação Diária
- “Can a 10,000 year old weapon generate more destructive energy than a modern firearm?” - Esta pergunta instiga a curiosidade.
- “A sling is basically a pouch attached to two cords.” - Uma explicação simples sobre a funda.
- “It takes a lot of practice especially to get accurate with it.” - Lembre-se que a prática leva à perfeição.
- “When you swing a sling, the tension in the cords generates kinetic energy.” - Uma observação interessante sobre física.
- “Now I’m starting to get the timing down.” - Uma expressão comum para indicar progresso no aprendizado.
Guia Passo a Passo para Shadowing
Para utilizar o método de shadowing com este vídeo e aprimorar seu inglês, siga este guia passo a passo:
- Assista ao vídeo com atenção: Primeiramente, escute as frases e tente entender o contexto geral, focando na pronúncia e entonação do apresentador.
- Anote palavras e expressões: Preste atenção nas palavras novas e nas expressões que se destacam, como "centripetal force" e "kinetic energy". Isso enriquecerá seu vocabulário.
- Repita em voz alta: Usando um shadow speech, tente imitar a maneira como o apresentador fala. Isso ajudará você a melhorar sua fluência e entonação.
- Divida em partes: Se algumas seções forem difíceis, pause o vídeo e repita pequenos trechos. O shadow speak é eficaz para segmentos curtos.
- Grave-se: Ao praticar, grave sua voz para poder ouvir e comparar com a do apresentador. Isso permite identificar áreas para melhorar.
Essa prática de conversação em inglês não só torna o aprendizado mais dinâmico, mas também ajuda a entender melhor a cultura e o contexto de temas variados. Aproveite este vídeo como um recurso valioso para aprender inglês com YouTube e evoluir suas habilidades linguísticas!
O que é a Técnica de Shadowing?
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