Tlak je ena od najpomembnejših fizikalnih količin, ki ti pomaga... Show more
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Updated Apr 10, 2026
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Kaj je tlak in kako ga izračunamo
1 / 6
Kaj je tlak?
Predstavljaj si, da stopiš na risalni žebljiček - boli, ker je vsa tvoja teža skoncentrirana na majhno konico. To je tlak v akciji! Tlak nam pove, kako je neka sila porazdeljena na določeno ploskev.
Osnovna formula za tlak je: p = F/S, kjer je p tlak, F sila in S ploskev. To pomeni, da če imaš isto silo, vendar manjšo površino, bo tlak večji. Zato oster nož reže bolje - ista sila roke je razporejena na manjšo površino rezila.
Iz te formule lahko izpelješ tudi F = p × S za silo in S = F/p za ploskev. Te formule boš potreboval pri reševanju nalog, zato si jih dobro zapomni.
Pomembno: Sila mora vedno delovati pravokotno na podlago, da lahko pravilno izračunaš tlak!
Enote in pretvarjanja
Pri izračunavanju tlaka moraš biti izjemno pazljiv na enote. V fiziki vedno uporabljamo SI sistem osnovnih enot.
Sila (F) se meri v newtonih (N). Pogosto je to sila teže, ki jo izračunaš z Fg = m × g. Masa m je v kilogramih, težni pospešek g pa približno 10 N/kg.
Ploskev (S) mora biti vedno v kvadratnih metrih (m²)! To je najpogostejša napaka na testih. Zapomni si pretvorbe: 1 m² = 100 dm² = 10.000 cm².
Pozor: Če imaš podatke v cm² ali dm², jih moraš obvezno pretvoriti v m² pred izračunom!
Enote za tlak in praktični primeri
Tlak (p) se meri v paskalih (Pa), poimenovanih po francoskem fiziku Pascalu. Velja 1 Pa = 1 N/m². Ker je paskal majhna enota, pogosto uporabljaš kilopaskale ali bare .
Ključna ideja: tlak in ploskev sta obratno sorazmerna. Večja ploskev pomeni manjši tlak pri enaki sili. Manjša ploskev pa večji tlak.
Poglejmo primer opeke z maso 4 kg na tleh. Če leži na največji ploskvi 20 cm × 10 cm, je sila teže 40 N, ploskev pa 0,02 m². Tlak je torej 2000 Pa ali 2 kPa.
Nasvet: Pri reševanju vedno najprej zapiši podatke, nato izračunaj silo teže, pretvori ploskev v m² in šele na koncu uporabi formulo za tlak.
Praktičen primer z učencem na snegu
Učenec z maso 60 kg stoji na snegu. S čevlji (skupna površina podplatov 400 cm²) povzroča tlak 15.000 Pa. Ko si nadene smuči s površino 0,4 m², pa se tlak zmanjša na samo 1500 Pa - to je 10-krat manj!
Postopek reševanja:
- Sila teže: 60 kg × 10 N/kg = 600 N
- S čevlji: ploskev 400 cm² = 0,04 m², tlak = 600 N / 0,04 m² = 15.000 Pa
- S smučmi: ploskev 0,4 m², tlak = 600 N / 0,4 m² = 1500 Pa
To razloži, zakro se z običajnimi čevlji udiraš v sneg, z smučmi pa drsiš po površini. Večja ploskev smuči razporedi tvojo težo na večjo površino.
Ključno spoznanje: Z večanjem ploskve se tlak zmanjšuje - to je temelj delovanja smuči, koles in drugih pripomočkov.
Nasveti za uspešno reševanje nalog
Najpogostejša napaka je pozabljanje na pretvarjanje enot za ploskev! Vedno mora biti v m², ne v cm² ali dm².
Pri reševanju vedno preveri, ali je sila podana ali jo moraš izračunati iz mase z F = m × g. Zapomni si tudi osnovni razmerji: večja sila pomeni večji tlak, večja ploskev pa manjši tlak.
| Kaj se spremeni | Kako vpliva na tlak |
|---|---|
| Sila se poveča | Tlak se poveča |
| Ploskev se poveča | Tlak se zmanjša |
Koristni nasveti za test: Vedno preveri enote, ne pozabi na pretvarjanje cm² v m² (deli z 10.000) in zapomni si, da je tlak obratno sorazmeren s ploskvijo.
Za odličen rezultat: Naučena formula p = F/S plus pravilno pretvarjanje enot te pripeljeta do pravilnega odgovora pri vseh osnovnih nalogah o tlaku.
Povzetek ključnih točk
Osnove: Tlak je sila na enoto ploskve, formula p = F/S. Manjša ploskev pri enaki sili pomeni večji tlak - zato funcionirajo ostra orodja.
Enote: Tlak v paskalih (Pa), sila v newtonih (N), ploskev v kvadratnih metrih (m²). Ne pozabi: 1 m² = 10.000 cm²!
Sila teže: Če imaš maso, silo izračunaš z Fg = m × g, kjer je g ≈ 10 N/kg.
Praktično: Smuči, široke pnevmatike, ostri noži - vse temelji na razumevanju tlaka. Večja površina pomeni manjši tlak in obratno.
Zaključek: S to formulo in pazljivostjo pri enotah boš brez težav rešil vse naloge o tlaku. Ključ je v sistematičnem pristopu in pravilnem pretvarjanju enot!
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.
Most popular content in Fizika
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
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
Kaj je tlak in kako ga izračunamo
Tlak je ena od najpomembnejših fizikalnih količin, ki ti pomaga razumeti, zakaj oster nož reže bolje od topega in zakaj se z običajnimi čevlji udremo v sneg, z smučmi pa ne. Gre za to, kako je sila "zgoščena" na določeni... Show more
Kaj je tlak?
Predstavljaj si, da stopiš na risalni žebljiček - boli, ker je vsa tvoja teža skoncentrirana na majhno konico. To je tlak v akciji! Tlak nam pove, kako je neka sila porazdeljena na določeno ploskev.
Osnovna formula za tlak je: p = F/S, kjer je p tlak, F sila in S ploskev. To pomeni, da če imaš isto silo, vendar manjšo površino, bo tlak večji. Zato oster nož reže bolje - ista sila roke je razporejena na manjšo površino rezila.
Iz te formule lahko izpelješ tudi F = p × S za silo in S = F/p za ploskev. Te formule boš potreboval pri reševanju nalog, zato si jih dobro zapomni.
Pomembno: Sila mora vedno delovati pravokotno na podlago, da lahko pravilno izračunaš tlak!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Enote in pretvarjanja
Pri izračunavanju tlaka moraš biti izjemno pazljiv na enote. V fiziki vedno uporabljamo SI sistem osnovnih enot.
Sila (F) se meri v newtonih (N). Pogosto je to sila teže, ki jo izračunaš z Fg = m × g. Masa m je v kilogramih, težni pospešek g pa približno 10 N/kg.
Ploskev (S) mora biti vedno v kvadratnih metrih (m²)! To je najpogostejša napaka na testih. Zapomni si pretvorbe: 1 m² = 100 dm² = 10.000 cm².
Pozor: Če imaš podatke v cm² ali dm², jih moraš obvezno pretvoriti v m² pred izračunom!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Enote za tlak in praktični primeri
Tlak (p) se meri v paskalih (Pa), poimenovanih po francoskem fiziku Pascalu. Velja 1 Pa = 1 N/m². Ker je paskal majhna enota, pogosto uporabljaš kilopaskale ali bare .
Ključna ideja: tlak in ploskev sta obratno sorazmerna. Večja ploskev pomeni manjši tlak pri enaki sili. Manjša ploskev pa večji tlak.
Poglejmo primer opeke z maso 4 kg na tleh. Če leži na največji ploskvi 20 cm × 10 cm, je sila teže 40 N, ploskev pa 0,02 m². Tlak je torej 2000 Pa ali 2 kPa.
Nasvet: Pri reševanju vedno najprej zapiši podatke, nato izračunaj silo teže, pretvori ploskev v m² in šele na koncu uporabi formulo za tlak.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktičen primer z učencem na snegu
Učenec z maso 60 kg stoji na snegu. S čevlji (skupna površina podplatov 400 cm²) povzroča tlak 15.000 Pa. Ko si nadene smuči s površino 0,4 m², pa se tlak zmanjša na samo 1500 Pa - to je 10-krat manj!
Postopek reševanja:
- Sila teže: 60 kg × 10 N/kg = 600 N
- S čevlji: ploskev 400 cm² = 0,04 m², tlak = 600 N / 0,04 m² = 15.000 Pa
- S smučmi: ploskev 0,4 m², tlak = 600 N / 0,4 m² = 1500 Pa
To razloži, zakro se z običajnimi čevlji udiraš v sneg, z smučmi pa drsiš po površini. Večja ploskev smuči razporedi tvojo težo na večjo površino.
Ključno spoznanje: Z večanjem ploskve se tlak zmanjšuje - to je temelj delovanja smuči, koles in drugih pripomočkov.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Nasveti za uspešno reševanje nalog
Najpogostejša napaka je pozabljanje na pretvarjanje enot za ploskev! Vedno mora biti v m², ne v cm² ali dm².
Pri reševanju vedno preveri, ali je sila podana ali jo moraš izračunati iz mase z F = m × g. Zapomni si tudi osnovni razmerji: večja sila pomeni večji tlak, večja ploskev pa manjši tlak.
| Kaj se spremeni | Kako vpliva na tlak |
|---|---|
| Sila se poveča | Tlak se poveča |
| Ploskev se poveča | Tlak se zmanjša |
Koristni nasveti za test: Vedno preveri enote, ne pozabi na pretvarjanje cm² v m² (deli z 10.000) in zapomni si, da je tlak obratno sorazmeren s ploskvijo.
Za odličen rezultat: Naučena formula p = F/S plus pravilno pretvarjanje enot te pripeljeta do pravilnega odgovora pri vseh osnovnih nalogah o tlaku.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Povzetek ključnih točk
Osnove: Tlak je sila na enoto ploskve, formula p = F/S. Manjša ploskev pri enaki sili pomeni večji tlak - zato funcionirajo ostra orodja.
Enote: Tlak v paskalih (Pa), sila v newtonih (N), ploskev v kvadratnih metrih (m²). Ne pozabi: 1 m² = 10.000 cm²!
Sila teže: Če imaš maso, silo izračunaš z Fg = m × g, kjer je g ≈ 10 N/kg.
Praktično: Smuči, široke pnevmatike, ostri noži - vse temelji na razumevanju tlaka. Večja površina pomeni manjši tlak in obratno.
Zaključek: S to formulo in pazljivostjo pri enotah boš brez težav rešil vse naloge o tlaku. Ključ je v sistematičnem pristopu in pravilnem pretvarjanju enot!
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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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
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