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Updated Apr 13, 2026
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Osnove fizikalnih količin in SI enot
1 / 5
Uvod v merjenje
Predstavljaj si, da bi vsak meril dolžino s svojimi koraki - kakšen kaos bi nastal! Zato v fiziki vse merjenje temelji na dogovorjenih standardih, ki jih vsi razumemo.
Fizikalna količina je vse, kar lahko izmerimo - dolžina, masa, čas, temperatura. Vsaka ima svoj simbol . Enota pa je tista dogovorjena vrednost, s katero primerjamo - kot meter za dolžino ali kilogram za maso.
Mednarodni sistem enot (SI) je kot skupni jezik za znanstvenike po vsem svetu. V Sloveniji je uporaba SI enot celo obvezna! Tako se vsi razumemo, ne glede na to, ali živimo v Ljubljani ali New Yorku.
Ključno: Rezultat merjenja je VEDNO število + enota. Samo "5" ne pomeni nič, "5 kg" pa že pove zgodbo!
Dolžina - od milimetrov do kilometrov
Dolžina opisuje razdaljo med dvema točkama ali velikost telesa. Njen simbol je l (iz angleške "length"), osnovna SI enota pa je meter (m).
Predpone so tvoji najboljši prijatelji pri pretvarjanju! Kilo- pomeni 1000-krat več, centi- 100-krat manj, mili- pa 1000-krat manj. Tako je 1 km = 1000 m, 1 cm = 0,01 m.
Primeri iz vsakdana: kilometer za razdalje med mesti, decimeter za dolžino zvezka, centimeter za širino prsta, milimeter za debelino nohta.
Nasvět: Predstavljaj si predpone kot stopnice - ko greš navzgor (v večje enote), deliš. Ko greš navzdol (v manjše enote), množiš!
Masa in čas - temeljna gradnika
Masa (simbol m) pove, koliko snovi je v telesu. Osnovna enota je kilogram (kg) - edina SI enota s predpono že v imenu! Ne mešaj mase s težo - masa je količina snovi, teža pa sila.
Zanimive enote: tona za avtomobile (1000 kg), dekagram za salamijo (0,01 kg), miligram za zdravila (0,000001 kg).
Čas (simbol t) opisuje trajanje dogodkov. Osnovna enota je sekunda (s). Čeprav niso SI enote, vsakdanje enote poznamo: 1 minuta = 60 s, 1 ura = 3600 s.
Pozor: Pri pretvarjanju časa si pomagaj z vsakdanjimi situacijami - koliko sekund traja šolska ura?
Pretvarjanje enot - praksa dela mojstra
Zlatno pravilo pretvarjanja: večja → manjša enota = MNOŽIMO, manjša → večja enota = DELIMO.
Primer: 1,5 km v metre? Ker gremo iz večje (km) v manjšo (m) enoto, množimo: 1,5 × 1000 = 1500 m. V centimetre? 1500 × 100 = 150.000 cm.
Za maso: 250 g v kg? Gremo iz manjše v večjo, torej delimo: 250 ÷ 1000 = 0,25 kg.
Za čas: 45 minut v sekunde? Iz večje v manjšo, množimo: 45 × 60 = 2700 s.
Preveritev: Če greš iz km v m, mora biti končno število večje - kilometrov je "manj" kot metrov na isti razdalji!
Povzetek za mojstra fizike
Te tri osnovne količine SI moraš obvladati: dolžina (l, meter), masa (m, kilogram), čas (t, sekunda). To je tvoja osnova za celotno fiziko!
Predpone so ključne: kilo- (×1000), centi- (÷100), mili- (÷1000). Z njimi obvladaš večino pretvorb.
Pravilo pretvarjanja si zapomni z logiko: če imaš 1 km, bo to "veliko" metrov (množiš). Če imaš 1000 g, bo to "malo" kilogramov (deliš).
Za test: Vedno zapiši enoto! Brez nje je tvoj odgovor nepopoln, tudi če je številka pravilna.
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
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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
Osnove fizikalnih količin in SI enot
Fizika je kot jezik, ki potrebuje svoja pravila in dogovore - to so fizikalne količine in enote. Brez njih ne bi mogli graditi hiš, kuhati po receptih ali celo meriti hitrosti avtomobilov!
Uvod v merjenje
Predstavljaj si, da bi vsak meril dolžino s svojimi koraki - kakšen kaos bi nastal! Zato v fiziki vse merjenje temelji na dogovorjenih standardih, ki jih vsi razumemo.
Fizikalna količina je vse, kar lahko izmerimo - dolžina, masa, čas, temperatura. Vsaka ima svoj simbol . Enota pa je tista dogovorjena vrednost, s katero primerjamo - kot meter za dolžino ali kilogram za maso.
Mednarodni sistem enot (SI) je kot skupni jezik za znanstvenike po vsem svetu. V Sloveniji je uporaba SI enot celo obvezna! Tako se vsi razumemo, ne glede na to, ali živimo v Ljubljani ali New Yorku.
Ključno: Rezultat merjenja je VEDNO število + enota. Samo "5" ne pomeni nič, "5 kg" pa že pove zgodbo!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Dolžina - od milimetrov do kilometrov
Dolžina opisuje razdaljo med dvema točkama ali velikost telesa. Njen simbol je l (iz angleške "length"), osnovna SI enota pa je meter (m).
Predpone so tvoji najboljši prijatelji pri pretvarjanju! Kilo- pomeni 1000-krat več, centi- 100-krat manj, mili- pa 1000-krat manj. Tako je 1 km = 1000 m, 1 cm = 0,01 m.
Primeri iz vsakdana: kilometer za razdalje med mesti, decimeter za dolžino zvezka, centimeter za širino prsta, milimeter za debelino nohta.
Nasvět: Predstavljaj si predpone kot stopnice - ko greš navzgor (v večje enote), deliš. Ko greš navzdol (v manjše enote), množiš!
Sign up to see the contentIt's free!
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Masa in čas - temeljna gradnika
Masa (simbol m) pove, koliko snovi je v telesu. Osnovna enota je kilogram (kg) - edina SI enota s predpono že v imenu! Ne mešaj mase s težo - masa je količina snovi, teža pa sila.
Zanimive enote: tona za avtomobile (1000 kg), dekagram za salamijo (0,01 kg), miligram za zdravila (0,000001 kg).
Čas (simbol t) opisuje trajanje dogodkov. Osnovna enota je sekunda (s). Čeprav niso SI enote, vsakdanje enote poznamo: 1 minuta = 60 s, 1 ura = 3600 s.
Pozor: Pri pretvarjanju časa si pomagaj z vsakdanjimi situacijami - koliko sekund traja šolska ura?
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Pretvarjanje enot - praksa dela mojstra
Zlatno pravilo pretvarjanja: večja → manjša enota = MNOŽIMO, manjša → večja enota = DELIMO.
Primer: 1,5 km v metre? Ker gremo iz večje (km) v manjšo (m) enoto, množimo: 1,5 × 1000 = 1500 m. V centimetre? 1500 × 100 = 150.000 cm.
Za maso: 250 g v kg? Gremo iz manjše v večjo, torej delimo: 250 ÷ 1000 = 0,25 kg.
Za čas: 45 minut v sekunde? Iz večje v manjšo, množimo: 45 × 60 = 2700 s.
Preveritev: Če greš iz km v m, mora biti končno število večje - kilometrov je "manj" kot metrov na isti razdalji!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Povzetek za mojstra fizike
Te tri osnovne količine SI moraš obvladati: dolžina (l, meter), masa (m, kilogram), čas (t, sekunda). To je tvoja osnova za celotno fiziko!
Predpone so ključne: kilo- (×1000), centi- (÷100), mili- (÷1000). Z njimi obvladaš večino pretvorb.
Pravilo pretvarjanja si zapomni z logiko: če imaš 1 km, bo to "veliko" metrov (množiš). Če imaš 1000 g, bo to "malo" kilogramov (deliš).
Za test: Vedno zapiši enoto! Brez nje je tvoj odgovor nepopoln, tudi če je številka pravilna.
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