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Updated May 21, 2026
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Razumevanje sile in njenih vrst: osnove fizike
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Pojem sile in njene vrste
Če ti je že kdaj težko poriniti mizo ali si se zdrsnil na ledu, si že izkusil delovanje sil. Sila je fizikalna količina, ki povzroči, da se telo začne gibati, ustavi, spremeni smer ali se deformira.
Sila (F) je vektorska količina - to pomeni, da je pomembna tako njena velikost kot tudi smer. Merimo jo v Newtonih (N). En Newton je sila, ki da telesu z maso 1 kg pospešek 1 m/s².
Sile delimo na kontaktne (delujejo ob dotiku, kot trenje) in brezkontaktne (delujejo na daljavo, kot gravitacija). Za teste morate poznati glavni razliko med maso in težo!
💡 Pozor na test! Masa ni teža - to je najpogostejša napaka! Masa je količina snovi (kg), teža pa je sila (N).
Sila teže in masa
Ne zamenjuj mase in teže - to je ključno za uspeh na testih! Masa (m) pove, koliko snovi je v telesu, in se nikoli ne spremeni. Teža (Fg) pa je sila, s katero te Zemlja vleče navzdol.
Težo izračunamo s formulo: Fg = m · g, kjer je g ≈ 10 m/s² (za lažje računanje). Če imaš maso 60 kg, je tvoja teža 600 N. Na Luni bi bila tvoja masa še vedno 60 kg, teža pa le 100 N!
Maso merimo s tehtnico, težo pa z dinamometrom (vzmetna tehtnica). Razlika je očitna - če bi se stehtala v dvigalu, ki se pospešuje navzgor, bi dinamometer pokazal večjo vrednost, tehtnica pa ne.
💡 Hitra pomoč: Če se sprašuješ, ali gre za maso ali težo - poglej enoto! Kg = masa, N = teža.
Sila trenja
Brez trenja ne bi mogel hoditi - stopala bi ti drsela kot na ledu! Trenje je sila, ki vedno nasprotuje gibanju ali poskusu gibanja med dvema ploskvama.
Obstajata dve vrsti trenja. Trenje lepenja deluje, ko je telo mirno in ga poskušaš premakniti - zato je težko začeti riniti težko omaro. Trenje drsenja deluje med gibanjem in je običajno manjše od maksimalnega trenja lepenja.
Smer trenja je vedno nasprotna smeri gibanja. Ko hodiš naprej, trenje deluje nazaj na tvoja stopala, a hkrati naprej na tla - tako se lahko odrivaš.
💡 V vsakdanjem življenju: Zaviranje avtomobila, hoja, drgnjenje rok za toploto - vse to je mogoče zaradi trenja!
Sila prožnosti in sila podlage
Ko napneš lok ali stisneš žogo, se pojavi sila prožnosti (Fpro). Ta sila si prizadeva telo povrniti v prvotno obliko - bolj ko razteženš vzmet, močnejša je sila, ki jo vleče nazaj.
Sila podlage (Fp) je razlog, zakaj ne padeš skozi tla! To je kontaktna sila, ki je vedno pravokotna na podlago in kaže stran od nje. Miza "potisne" knjigo navzgor z enako silo, kot knjiga pritiska nanjo navzdol.
Ko knjiga miruje na mizi, sta sila podlage in sila teže v ravnovesju - enako veliki, nasprotno usmerjeni. Zato knjiga ne pade skozi mizo in ne leti v zrak.
💡 Za risanje sil: Vedno nariši sili z enako dolgimi puščicami, če je telo v ravnovesju!
Rešeni primeri
Primer: Učenka z maso 50 kg stoji na tleh. Kolikšna je njena teža in sila podlage?
Najprej izračunaj težo: Fg = m · g = 50 kg · 10 m/s² = 500 N. Ker učenka miruje, je sila podlage enaka teži: Fp = 500 N navzgor.
Na risbi narišeš dve puščici - težo navzdol in silo podlage navzgor, obe enako dolgi. To je tipična naloga za teste!
Pomembno za reševanje: Vedno najprej preveri, ali je telo v ravnovesju (miruje ali se giblje enakomerno). Če da, je vsota vseh sil enaka nič.
💡 Trik za teste: Pri računanju teže lahko zaokrožiš g na 10 m/s² - lažje se izide!
Ključni povzetek za test
Za test obvezno znaj: sila je vektor (smer je enako pomembna kot velikost), Fg = m · g, masa ≠ teža, in ravnovesje sil.
Sile, ki jih moraš poznati:
- Teža: Fg = m · g (sila Zemljine privlačnosti)
- Trenje: nasprotuje gibanju, omogoča hojo
- Prožnost: skuša povrniti prvotno obliko (vzmeti)
- Sila podlage: preprečuje padanje skozi podlago
Največje pasti na testih: zamenjava mase in teže, pozabljanje na smer sil, in narobe izračunana sila podlage pri ravnovesju.
💡 Zadnji nasvet: Pri risanju sil vedno označiš smer s puščico in velikost z dolžino!
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
Razumevanje sile in njenih vrst: osnove fizike
Sile so povsod okoli nas in so razlog, zakaj se stvari premikajo, se ustavijo ali spremenijo obliko. V fiziki je razumevanje sil ključno za razumevanje gibanja - od hoje do vožnje avtomobila.
Pojem sile in njene vrste
Če ti je že kdaj težko poriniti mizo ali si se zdrsnil na ledu, si že izkusil delovanje sil. Sila je fizikalna količina, ki povzroči, da se telo začne gibati, ustavi, spremeni smer ali se deformira.
Sila (F) je vektorska količina - to pomeni, da je pomembna tako njena velikost kot tudi smer. Merimo jo v Newtonih (N). En Newton je sila, ki da telesu z maso 1 kg pospešek 1 m/s².
Sile delimo na kontaktne (delujejo ob dotiku, kot trenje) in brezkontaktne (delujejo na daljavo, kot gravitacija). Za teste morate poznati glavni razliko med maso in težo!
💡 Pozor na test! Masa ni teža - to je najpogostejša napaka! Masa je količina snovi (kg), teža pa je sila (N).
Sign up to see the contentIt's free!
Access to all documents
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Sila teže in masa
Ne zamenjuj mase in teže - to je ključno za uspeh na testih! Masa (m) pove, koliko snovi je v telesu, in se nikoli ne spremeni. Teža (Fg) pa je sila, s katero te Zemlja vleče navzdol.
Težo izračunamo s formulo: Fg = m · g, kjer je g ≈ 10 m/s² (za lažje računanje). Če imaš maso 60 kg, je tvoja teža 600 N. Na Luni bi bila tvoja masa še vedno 60 kg, teža pa le 100 N!
Maso merimo s tehtnico, težo pa z dinamometrom (vzmetna tehtnica). Razlika je očitna - če bi se stehtala v dvigalu, ki se pospešuje navzgor, bi dinamometer pokazal večjo vrednost, tehtnica pa ne.
💡 Hitra pomoč: Če se sprašuješ, ali gre za maso ali težo - poglej enoto! Kg = masa, N = teža.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sila trenja
Brez trenja ne bi mogel hoditi - stopala bi ti drsela kot na ledu! Trenje je sila, ki vedno nasprotuje gibanju ali poskusu gibanja med dvema ploskvama.
Obstajata dve vrsti trenja. Trenje lepenja deluje, ko je telo mirno in ga poskušaš premakniti - zato je težko začeti riniti težko omaro. Trenje drsenja deluje med gibanjem in je običajno manjše od maksimalnega trenja lepenja.
Smer trenja je vedno nasprotna smeri gibanja. Ko hodiš naprej, trenje deluje nazaj na tvoja stopala, a hkrati naprej na tla - tako se lahko odrivaš.
💡 V vsakdanjem življenju: Zaviranje avtomobila, hoja, drgnjenje rok za toploto - vse to je mogoče zaradi trenja!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sila prožnosti in sila podlage
Ko napneš lok ali stisneš žogo, se pojavi sila prožnosti (Fpro). Ta sila si prizadeva telo povrniti v prvotno obliko - bolj ko razteženš vzmet, močnejša je sila, ki jo vleče nazaj.
Sila podlage (Fp) je razlog, zakaj ne padeš skozi tla! To je kontaktna sila, ki je vedno pravokotna na podlago in kaže stran od nje. Miza "potisne" knjigo navzgor z enako silo, kot knjiga pritiska nanjo navzdol.
Ko knjiga miruje na mizi, sta sila podlage in sila teže v ravnovesju - enako veliki, nasprotno usmerjeni. Zato knjiga ne pade skozi mizo in ne leti v zrak.
💡 Za risanje sil: Vedno nariši sili z enako dolgimi puščicami, če je telo v ravnovesju!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rešeni primeri
Primer: Učenka z maso 50 kg stoji na tleh. Kolikšna je njena teža in sila podlage?
Najprej izračunaj težo: Fg = m · g = 50 kg · 10 m/s² = 500 N. Ker učenka miruje, je sila podlage enaka teži: Fp = 500 N navzgor.
Na risbi narišeš dve puščici - težo navzdol in silo podlage navzgor, obe enako dolgi. To je tipična naloga za teste!
Pomembno za reševanje: Vedno najprej preveri, ali je telo v ravnovesju (miruje ali se giblje enakomerno). Če da, je vsota vseh sil enaka nič.
💡 Trik za teste: Pri računanju teže lahko zaokrožiš g na 10 m/s² - lažje se izide!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ključni povzetek za test
Za test obvezno znaj: sila je vektor (smer je enako pomembna kot velikost), Fg = m · g, masa ≠ teža, in ravnovesje sil.
Sile, ki jih moraš poznati:
- Teža: Fg = m · g (sila Zemljine privlačnosti)
- Trenje: nasprotuje gibanju, omogoča hojo
- Prožnost: skuša povrniti prvotno obliko (vzmeti)
- Sila podlage: preprečuje padanje skozi podlago
Največje pasti na testih: zamenjava mase in teže, pozabljanje na smer sil, in narobe izračunana sila podlage pri ravnovesju.
💡 Zadnji nasvet: Pri risanju sil vedno označiš smer s puščico in velikost z dolžino!
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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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