Už ťa niekedy napadlo, prečo pláva ľad na vode alebo... Show more
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Updated Mar 19, 2026
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Vztlaková sila: Archimedov zákon jednoducho
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Vztlaková sila a Archimedov zákon - základy
Keď sa ponoríš do bazéna, cítiš sa ľahší - to je práve vztlaková sila v akcii! Táto sila pôsobí na všetky telesá ponorené v kvapalinách (ako voda, olej) alebo plynoch (ako vzduch). Vďaka nej lietajú teplovzdušné balóny a plávajú obrovské lode.
Aby si tomu rozumel, musíš poznať pár základných pojmov. Objem ti hovorí, koľko miesta teleso zaberá (meriame v m³). Hustota ti prezradí, aké je teleso "ťažké" na svoj objem - vypočítaš ju ako hmotnosť delenú objemom.
Hustota vody je 1000 kg/m³ a toto číslo budeš často používať. Pre gravitačné zrýchlenie g používame hodnotu 10 N/kg, čo ti výpočty zjednoduší.
Tip: Zapamätaj si - hustota vody je 1000 kg/m³ a g = 10 N/kg. Tieto hodnoty budeš potrebovať pri každom výpočte!
Ako vzniká vztlaková sila
Predstav si fľašu ponorennú vo vode - voda na ňu tlačí zo všetkých strán, ale nie rovnako! Tlak vody rastie s hĺbkou, takže spodok fľaše má na seba väčší tlak ako vrchnú časť.
Tento rozdiel tlakov vytvára výslednú silu smerujúcu nahor - to je tá famózna vztlaková sila. Čím hlbšie je teleso ponorené, tým väčší je tento rozdiel.
Archimedov zákon presne definuje veľkosť tejto sily: vztlaková sila sa rovná tiaži kvapaliny, ktorú teleso vytlačí. Ak teda ponoríš kameň do vody, vztlaková sila je taká veľká, ako keby si odvážil vytlačenú vodu.
Vzorec vyzerá takto: F_vz = V_ponorenej × ρ_kvapaliny × g. Zapamätaj si, že V_ponorenej je len tá časť telesa, ktorá je skutočne pod hladinou!
Prečo telesá plávajú alebo sa potápajú
Na každé teleso v kvapaline pôsobia dve sily: gravitačná sila (ťahá nadol) a vztlaková sila (tlačí nahor). Podľa toho, ktorá je silnejšia, sa rozhodne osud telesa.
Ak je vztlaková sila väčšia , teleso pláva na hladine. Stane sa to, keď má teleso menšiu hustotu ako kvapalina - preto pláva drevo na vode. Keď je vztlaková sila menšia , teleso sa potopí - ako kameň, ktorý má väčšiu hustotu ako voda.
Špeciálny prípad nastane, keď sú sily rovnaké - teleso sa vznáša v kvapaline. Tak fungujú ponorky, ktoré dokážu ovládať svoju hustotu naplnením alebo vyprázdnením vodných nádrží.
Rýchly test: Porovnaj hustoty! Ak ρ_telesa < ρ_kvapaliny → pláva, ak ρ_telesa > ρ_kvapaliny → potápa sa.
Riešené príklady - drevený klátik
Majme drevený klátik s objemom 0,005 m³ celkom ponorený vo vode. Aká je vztlaková sila?
Najprv si zapíš dané údaje: V_ponorenej = 0,005 m³, ρ_vody = 1000 kg/m³, g = 10 N/kg. Použiješ vzorec F_vz = V_ponorenej × ρ_kvapaliny × g.
Dosadíš: F_vz = 0,005 × 1000 × 10 = 50 N. Vztlaková sila je teda 50 N smerom nahor.
Toto je základný typ úlohy, ktorý určite stretneš na teste. Kľúčové je správne určiť objem ponorenej časti a nezabudnúť na jednotky!
Riešené príklady - kamenná guľa
Kamenná guľa má hmotnosť 2 kg a objem 0,0008 m³. Potopí sa vo vode alebo bude plávať?
Musíš porovnať gravitačnú silu s vztlakovou silou. Gravitačná sila: F_g = m × g = 2 × 10 = 20 N. Vztlaková sila (ak by bola celá ponorená): F_vz = 0,0008 × 1000 × 10 = 8 N.
Keďže F_g (20 N) > F_vz (8 N), guľa sa potopí. Alternatívne môžeš porovnať hustoty: ρ_gule = 2/0,0008 = 2500 kg/m³, čo je viac ako hustota vody .
Obidva spôsoby dajú rovnaký výsledok - kamenná guľa sa potopí!
Skratka: Ak poznáš hustotu telesa, stačí ju porovnať s hustotou kvapaliny - je to rýchlejšie než počítanie síl.
Riešené príklady - plávajúca loďka
Drevená loďka s hmotnosťou 150 kg pláva na jazere. Aký objem loďky je ponorený pod hladinou?
Keď teleso pláva, je v rovnováhe - vztlaková sila sa rovná gravitačnej sile. F_g = 150 × 10 = 1500 N, takže aj F_vz = 1500 N.
Teraz použiješ vzorec vztlakovej sily a vyjadrí si V_ponorenej: 1500 = V_ponorenej × 1000 × 10. Po úprave: V_ponorenej = 1500/10000 = 0,15 m³.
Pod hladinou je teda ponorených 0,15 m³ loďky. Takéto úlohy sú obľúbené na testoch, lebo kombinujú podmienku rovnováhy s výpočtom objemu.
Praktické aplikácie a tipy
Lode z kovu plávajú, hoci je kov ťažší ako voda, pretože sú duté. Ich priemerná hustota (vrátane vzduchu vo vnútri) je menšia ako hustota vody. Ponorky menia svoju hustotu naplnením alebo vyprázdnením vodných nádrží.
Teplovzdušné balóny lietajú, lebo ohriaty vzduch vo vnútri má menšiu hustotu ako studený vzduch okolo. Archimedov zákon totiž platí aj pre plyny!
Pri riešení úloh vždy kontroluj jednotky - objem v m³, hustota v kg/m³, sila v N. Používaj g = 10 N/kg pre jednoduchšie výpočty.
Pamätka: Pláva , potápa sa , vznáša sa
Zhrnutie pre test
Na teste si zapamätaj tieto kľúčové body: Vztlaková sila tlačí teleso nahor a jej veľkosť určuje Archimedov zákon. Vzorec F_vz = V_ponorenej × ρ_kvapaliny × g je tvoj najlepší kamarát.
Či teleso pláva alebo sa potápa, závisí od porovnania hustôt. Rýchle pravidlo: menšia hustota = pláva, väčšia hustota = potápa sa, rovnaká hustota = vznáša sa.
Pri výpočtoch pozor na objem ponorenej časti - ak teleso pláva, nie je celé pod hladinou! A nezabudni na správne jednotky.
Tieto princípy vysvetľujú všetko od plávajúcich ľadovcov po obrovské nákladné lode. Teraz už vieš, prečo funguje svet okolo teba!
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Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
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iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Vztlaková sila: Archimedov zákon jednoducho
Už ťa niekedy napadlo, prečo pláva ľad na vode alebo ako fungujú ponorky? Všetko to súvisí so vztlakovou silou a slávnym Archimedovým zákonom, ktorý objavil staroveký grécky vedec.
Vztlaková sila a Archimedov zákon - základy
Keď sa ponoríš do bazéna, cítiš sa ľahší - to je práve vztlaková sila v akcii! Táto sila pôsobí na všetky telesá ponorené v kvapalinách (ako voda, olej) alebo plynoch (ako vzduch). Vďaka nej lietajú teplovzdušné balóny a plávajú obrovské lode.
Aby si tomu rozumel, musíš poznať pár základných pojmov. Objem ti hovorí, koľko miesta teleso zaberá (meriame v m³). Hustota ti prezradí, aké je teleso "ťažké" na svoj objem - vypočítaš ju ako hmotnosť delenú objemom.
Hustota vody je 1000 kg/m³ a toto číslo budeš často používať. Pre gravitačné zrýchlenie g používame hodnotu 10 N/kg, čo ti výpočty zjednoduší.
Tip: Zapamätaj si - hustota vody je 1000 kg/m³ a g = 10 N/kg. Tieto hodnoty budeš potrebovať pri každom výpočte!
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Ako vzniká vztlaková sila
Predstav si fľašu ponorennú vo vode - voda na ňu tlačí zo všetkých strán, ale nie rovnako! Tlak vody rastie s hĺbkou, takže spodok fľaše má na seba väčší tlak ako vrchnú časť.
Tento rozdiel tlakov vytvára výslednú silu smerujúcu nahor - to je tá famózna vztlaková sila. Čím hlbšie je teleso ponorené, tým väčší je tento rozdiel.
Archimedov zákon presne definuje veľkosť tejto sily: vztlaková sila sa rovná tiaži kvapaliny, ktorú teleso vytlačí. Ak teda ponoríš kameň do vody, vztlaková sila je taká veľká, ako keby si odvážil vytlačenú vodu.
Vzorec vyzerá takto: F_vz = V_ponorenej × ρ_kvapaliny × g. Zapamätaj si, že V_ponorenej je len tá časť telesa, ktorá je skutočne pod hladinou!
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Prečo telesá plávajú alebo sa potápajú
Na každé teleso v kvapaline pôsobia dve sily: gravitačná sila (ťahá nadol) a vztlaková sila (tlačí nahor). Podľa toho, ktorá je silnejšia, sa rozhodne osud telesa.
Ak je vztlaková sila väčšia , teleso pláva na hladine. Stane sa to, keď má teleso menšiu hustotu ako kvapalina - preto pláva drevo na vode. Keď je vztlaková sila menšia , teleso sa potopí - ako kameň, ktorý má väčšiu hustotu ako voda.
Špeciálny prípad nastane, keď sú sily rovnaké - teleso sa vznáša v kvapaline. Tak fungujú ponorky, ktoré dokážu ovládať svoju hustotu naplnením alebo vyprázdnením vodných nádrží.
Rýchly test: Porovnaj hustoty! Ak ρ_telesa < ρ_kvapaliny → pláva, ak ρ_telesa > ρ_kvapaliny → potápa sa.
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Riešené príklady - drevený klátik
Majme drevený klátik s objemom 0,005 m³ celkom ponorený vo vode. Aká je vztlaková sila?
Najprv si zapíš dané údaje: V_ponorenej = 0,005 m³, ρ_vody = 1000 kg/m³, g = 10 N/kg. Použiješ vzorec F_vz = V_ponorenej × ρ_kvapaliny × g.
Dosadíš: F_vz = 0,005 × 1000 × 10 = 50 N. Vztlaková sila je teda 50 N smerom nahor.
Toto je základný typ úlohy, ktorý určite stretneš na teste. Kľúčové je správne určiť objem ponorenej časti a nezabudnúť na jednotky!
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Riešené príklady - kamenná guľa
Kamenná guľa má hmotnosť 2 kg a objem 0,0008 m³. Potopí sa vo vode alebo bude plávať?
Musíš porovnať gravitačnú silu s vztlakovou silou. Gravitačná sila: F_g = m × g = 2 × 10 = 20 N. Vztlaková sila (ak by bola celá ponorená): F_vz = 0,0008 × 1000 × 10 = 8 N.
Keďže F_g (20 N) > F_vz (8 N), guľa sa potopí. Alternatívne môžeš porovnať hustoty: ρ_gule = 2/0,0008 = 2500 kg/m³, čo je viac ako hustota vody .
Obidva spôsoby dajú rovnaký výsledok - kamenná guľa sa potopí!
Skratka: Ak poznáš hustotu telesa, stačí ju porovnať s hustotou kvapaliny - je to rýchlejšie než počítanie síl.
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Riešené príklady - plávajúca loďka
Drevená loďka s hmotnosťou 150 kg pláva na jazere. Aký objem loďky je ponorený pod hladinou?
Keď teleso pláva, je v rovnováhe - vztlaková sila sa rovná gravitačnej sile. F_g = 150 × 10 = 1500 N, takže aj F_vz = 1500 N.
Teraz použiješ vzorec vztlakovej sily a vyjadrí si V_ponorenej: 1500 = V_ponorenej × 1000 × 10. Po úprave: V_ponorenej = 1500/10000 = 0,15 m³.
Pod hladinou je teda ponorených 0,15 m³ loďky. Takéto úlohy sú obľúbené na testoch, lebo kombinujú podmienku rovnováhy s výpočtom objemu.
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Praktické aplikácie a tipy
Lode z kovu plávajú, hoci je kov ťažší ako voda, pretože sú duté. Ich priemerná hustota (vrátane vzduchu vo vnútri) je menšia ako hustota vody. Ponorky menia svoju hustotu naplnením alebo vyprázdnením vodných nádrží.
Teplovzdušné balóny lietajú, lebo ohriaty vzduch vo vnútri má menšiu hustotu ako studený vzduch okolo. Archimedov zákon totiž platí aj pre plyny!
Pri riešení úloh vždy kontroluj jednotky - objem v m³, hustota v kg/m³, sila v N. Používaj g = 10 N/kg pre jednoduchšie výpočty.
Pamätka: Pláva , potápa sa , vznáša sa
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Zhrnutie pre test
Na teste si zapamätaj tieto kľúčové body: Vztlaková sila tlačí teleso nahor a jej veľkosť určuje Archimedov zákon. Vzorec F_vz = V_ponorenej × ρ_kvapaliny × g je tvoj najlepší kamarát.
Či teleso pláva alebo sa potápa, závisí od porovnania hustôt. Rýchle pravidlo: menšia hustota = pláva, väčšia hustota = potápa sa, rovnaká hustota = vznáša sa.
Pri výpočtoch pozor na objem ponorenej časti - ak teleso pláva, nie je celé pod hladinou! A nezabudni na správne jednotky.
Tieto princípy vysvetľujú všetko od plávajúcich ľadovcov po obrovské nákladné lode. Teraz už vieš, prečo funguje svet okolo teba!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user