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Updated May 9, 2026
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Osnove fizikalnih količin in merilnih enot: Preprosta razlaga
1 / 6
Kaj so fizikalne količine in enote
Predstavljaj si, da bi ti prijatelj rekel: "Moj telefon je dolg 15." Takoj bi ga vprašal: "15 česa? Centimetrov? Metrov?" Točno to je razlog, zakaj potrebujemo fizikalne količine in enote.
Fizikalna količina je enostavno vse, kar lahko izmeriš - dolžino mize, čas hoje v šolo ali kako vroče je zunaj. Ko nekaj izmeriš, vedno dobiš številsko vrednost (npr. 1,2) in mersko enoto (npr. meter).
Brez enote je število popolnoma neuporabno. Če rečeš "moja miza je dolga 1,2", nihče ne ve, ali govoriš o centimetrih ali metrih - to je ogromna razlika!
💡 Pomni: Vsaka meritev = števka + enota. Brez obojega si izgubljen!
Mednarodni sistem enot (SI) je kot univerzalni jezik za fizike po celem svetu. Tako se lahko znanstvenik iz Slovenije pogovarja z znanstvenikom iz Japonske in oba takoj razumeta, o čem govorita.
Osnovne količine v sistemu SI
Sistem SI ima 7 osnovnih količin, ampak ti se boš osredotočil na štiri najpomembnejše. To tabelo si obvezno zapomni - prišla ti bo prav pri vsakem testu!
V vsakdanjem življenju pogosto uporabljamo stopinje Celzija (°C) za temperaturo, čeprav je osnovna SI enota kelvin. To je čisto v redu - pomembno je, da veš, da obstajata obe enoti.
Izpeljane količine so kot recepti - nastanejo, ko zmešaš osnovne količine. Ploščina nastane, ko pomnoziš dolžino s širino . Prostornina nastane iz treh dolžin . Hitrost dobiš, ko pot deliš s časom .
💡 Nasvet: Pri izpeljanih količinah se enote vedejo enako kot števila - množiš jih, deliš, potenciraš.
Te količine niso samo teorija - uporabljasz jih ves čas! Ploščino potrebuješ pri urejanju sobe, prostornino pri paketu soka, hitrost pa pri vožnji s kolesom.
Predpone - tvoji najboljši prijatelji
Predstavljaj si, da bi moral debelino lasu meriti v metrih ali razdaljo do Ljubljane v milimetrih. Popolnoma nesmisleno, kajne? Zato uporabljamo predpone SI.
Predpone so kratice, ki ti povedo, kolikokrat je enota večja ali manjša od osnovne. Kilo- pomeni tisočkrat večje, centi- pomeni stokrat manjše, mili- pa tisočkrat manjše.
Najbolj praktične predpone so: kilogram (kg) za maso, centimeter (cm) za krajše razdalje, kilometer (km) za daljše razdalje in milimeter (mm) za zelo majhne stvari.
💡 Zlato pravilo: Večja enota → manjša → MNOŽIŠ. Manjša enota → večja → DELIŠ.
Predpone niso stvar, ki bi si jo moral na pamet učiti - raje jih razumi. 1 km je 1000 m, ker je "kilo" predpona za 1000. Logično!
Praktični primeri pretvarjanja
Pretvarjanje enot je kot menjava denarja - samo da namesto evrov v dolarje menjas metre v kilometre. Vzemimo konkreten primer: razdalja od doma do šole je 1,8 km.
Ko pretvarjašs iz kilometrov v metre, greš iz večje enote v manjšo, zato množiš. 1,8 km × 1000 = 1800 m. Enostavno!
Obratno: če imaš 250 g bonbonov in hočeš pretvoriti v kilograme, greš iz manjše enote v večjo, zato deliš. 250 g ÷ 1000 = 0,25 kg.
Pri ploščini paziti moraš na enote! Če imaš zvezek 30 cm × 20 cm, je ploščina 600 cm². Če hočeš rezultat v m², najprej pretvori dolžini: 0,3 m × 0,2 m = 0,06 m².
💡 Pomembno: Vedno preveri, ali so vse enote enake, preden računaš!
Pogosti triki in napake
Največja napaka je, ko pozabiš zapisati enoto. V fiziki rezultat brez enote velja nič! To je kot da bi rekel "imam veliko" namesto "imam 20 evrov".
Masa in teža nista isto! Masa (kg) je količina snovi v tvojem telesu - enaka je povsod, na Zemlji ali na Luni. Teža (N) pa je sila, s katero te planet vleče navzdol - na Luni bi tehtal šestkrat manje!
Pri pretvarjanju si zapomni preprosto logiko: če greš v manjšo enoto, bo številk več (množiš). Če greš v večjo enoto, bo številk manj (deliš).
Še en nasvet: vedno uporabljaj osnovno SI enoto za računanje. Tako se izogneš napakam in rezultat bo pravilno izražen.
💡 Pro tip: Naredi si tabelo predpon in jo imej pri roki - kmalu boš pretvarjal avtomatsko!
Hiter pregled za test
Osnove: Fizikalna količina je merljiva lastnost, merska enota je standard za primerjavo. Sistem SI omogoča sporazumevanje znanstvenikov po svetu.
Ključne količine: dolžina (m), masa (kg), čas (s), temperatura (K). Te so temelj vsega!
Izpeljane količine: ploščina (m²), prostornina (m³), hitrost . Nastanejo iz osnovnih količin.
Predpone: kilo- (1000×), centi- (1/100×), mili- (1/1000×). Omogočajo uporabo primernih velikosti enot.
💡 Za test: Vedno zapiši enoto, preveri pretvorbe in uporabljaj logiko!
Pretvarjanje: večja → manjša enota = množiš, manjša → večja enota = deliš. Pri računanju morajo biti vse enote enake!
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.
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
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
Osnove fizikalnih količin in merilnih enot: Preprosta razlaga
Ali se ti zdi fizika zapletena? Ne skrbi! Fizika pravzaprav začne z zelo preprostimi stvarmi - merjenjem. Vsak dan meriš čas (kdaj moraš vstati), dolžino (ali ti je majica dovolj dolga) in maso (koliko tehta tvoj nahrbtnik).
Kaj so fizikalne količine in enote
Predstavljaj si, da bi ti prijatelj rekel: "Moj telefon je dolg 15." Takoj bi ga vprašal: "15 česa? Centimetrov? Metrov?" Točno to je razlog, zakaj potrebujemo fizikalne količine in enote.
Fizikalna količina je enostavno vse, kar lahko izmeriš - dolžino mize, čas hoje v šolo ali kako vroče je zunaj. Ko nekaj izmeriš, vedno dobiš številsko vrednost (npr. 1,2) in mersko enoto (npr. meter).
Brez enote je število popolnoma neuporabno. Če rečeš "moja miza je dolga 1,2", nihče ne ve, ali govoriš o centimetrih ali metrih - to je ogromna razlika!
💡 Pomni: Vsaka meritev = števka + enota. Brez obojega si izgubljen!
Mednarodni sistem enot (SI) je kot univerzalni jezik za fizike po celem svetu. Tako se lahko znanstvenik iz Slovenije pogovarja z znanstvenikom iz Japonske in oba takoj razumeta, o čem govorita.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Osnovne količine v sistemu SI
Sistem SI ima 7 osnovnih količin, ampak ti se boš osredotočil na štiri najpomembnejše. To tabelo si obvezno zapomni - prišla ti bo prav pri vsakem testu!
V vsakdanjem življenju pogosto uporabljamo stopinje Celzija (°C) za temperaturo, čeprav je osnovna SI enota kelvin. To je čisto v redu - pomembno je, da veš, da obstajata obe enoti.
Izpeljane količine so kot recepti - nastanejo, ko zmešaš osnovne količine. Ploščina nastane, ko pomnoziš dolžino s širino . Prostornina nastane iz treh dolžin . Hitrost dobiš, ko pot deliš s časom .
💡 Nasvet: Pri izpeljanih količinah se enote vedejo enako kot števila - množiš jih, deliš, potenciraš.
Te količine niso samo teorija - uporabljasz jih ves čas! Ploščino potrebuješ pri urejanju sobe, prostornino pri paketu soka, hitrost pa pri vožnji s kolesom.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Predpone - tvoji najboljši prijatelji
Predstavljaj si, da bi moral debelino lasu meriti v metrih ali razdaljo do Ljubljane v milimetrih. Popolnoma nesmisleno, kajne? Zato uporabljamo predpone SI.
Predpone so kratice, ki ti povedo, kolikokrat je enota večja ali manjša od osnovne. Kilo- pomeni tisočkrat večje, centi- pomeni stokrat manjše, mili- pa tisočkrat manjše.
Najbolj praktične predpone so: kilogram (kg) za maso, centimeter (cm) za krajše razdalje, kilometer (km) za daljše razdalje in milimeter (mm) za zelo majhne stvari.
💡 Zlato pravilo: Večja enota → manjša → MNOŽIŠ. Manjša enota → večja → DELIŠ.
Predpone niso stvar, ki bi si jo moral na pamet učiti - raje jih razumi. 1 km je 1000 m, ker je "kilo" predpona za 1000. Logično!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri pretvarjanja
Pretvarjanje enot je kot menjava denarja - samo da namesto evrov v dolarje menjas metre v kilometre. Vzemimo konkreten primer: razdalja od doma do šole je 1,8 km.
Ko pretvarjašs iz kilometrov v metre, greš iz večje enote v manjšo, zato množiš. 1,8 km × 1000 = 1800 m. Enostavno!
Obratno: če imaš 250 g bonbonov in hočeš pretvoriti v kilograme, greš iz manjše enote v večjo, zato deliš. 250 g ÷ 1000 = 0,25 kg.
Pri ploščini paziti moraš na enote! Če imaš zvezek 30 cm × 20 cm, je ploščina 600 cm². Če hočeš rezultat v m², najprej pretvori dolžini: 0,3 m × 0,2 m = 0,06 m².
💡 Pomembno: Vedno preveri, ali so vse enote enake, preden računaš!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Pogosti triki in napake
Največja napaka je, ko pozabiš zapisati enoto. V fiziki rezultat brez enote velja nič! To je kot da bi rekel "imam veliko" namesto "imam 20 evrov".
Masa in teža nista isto! Masa (kg) je količina snovi v tvojem telesu - enaka je povsod, na Zemlji ali na Luni. Teža (N) pa je sila, s katero te planet vleče navzdol - na Luni bi tehtal šestkrat manje!
Pri pretvarjanju si zapomni preprosto logiko: če greš v manjšo enoto, bo številk več (množiš). Če greš v večjo enoto, bo številk manj (deliš).
Še en nasvet: vedno uporabljaj osnovno SI enoto za računanje. Tako se izogneš napakam in rezultat bo pravilno izražen.
💡 Pro tip: Naredi si tabelo predpon in jo imej pri roki - kmalu boš pretvarjal avtomatsko!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Hiter pregled za test
Osnove: Fizikalna količina je merljiva lastnost, merska enota je standard za primerjavo. Sistem SI omogoča sporazumevanje znanstvenikov po svetu.
Ključne količine: dolžina (m), masa (kg), čas (s), temperatura (K). Te so temelj vsega!
Izpeljane količine: ploščina (m²), prostornina (m³), hitrost . Nastanejo iz osnovnih količin.
Predpone: kilo- (1000×), centi- (1/100×), mili- (1/1000×). Omogočajo uporabo primernih velikosti enot.
💡 Za test: Vedno zapiši enoto, preveri pretvorbe in uporabljaj logiko!
Pretvarjanje: večja → manjša enota = množiš, manjša → večja enota = deliš. Pri računanju morajo biti vse enote enake!
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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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
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