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
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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!
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Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and 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
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4.7/5
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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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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 a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and 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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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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user