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Updated Apr 1, 2026
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Različne vrste energije in njihova uporaba
1 / 6
Uvod v energijo in ključni pojmi
Energija je kot supermoč - to je sposobnost telesa, da opravi delo. Brez nje se ne bi nič premikalo, ne bi bilo svetlobe ali toplote. Najvažnejše pravilo: energije ne moremo ustvariti ali uničiti, lahko jo samo pretvarjamo iz ene oblike v drugo.
Osnovna enota za energijo je džul (J) - ista enota, kot jo uporabljamo za delo. To ni naključje! Opravljeno delo je namreč enako spremembi energije.
Poznamo več vrst energije. Kinetična energija je energija gibanja - vsako telo, ki se premika, jo ima. Potencialna energija je "shranjena" energija zaradi lege ali oblike. Notranja energija pa je vsota energije vseh drobnih delcev v telesu in je povezana s temperaturo.
💡 Zakon o ohranitvi energije pomeni, da se skupna količina energije v zaprtem sistemu nikoli ne spremeni!
Kinetična energija - energija gibanja
Vsako gibanje pomeni kinetično energijo. Več kot ima telo mase in hitreje kot se giblje, več kinetične energije ima. Formula je preprosta: Wk = mv²/2.
Pri tej formuli pazi na dva ključna dela. Masa mora biti v kilogramih, hitrost pa obvezno v m/s . Če imaš hitrost v km/h, jo deli s 3,6.
Še pomembneje - hitrost je v formuli na kvadrat. To pomeni, da če se hitrost podvoji, se kinetična energija početveri! Zato so hitre vožnje tako nevarne.
💡 Hitri trik za pretvarjanje: 90 km/h ÷ 3,6 = 25 m/s
Gravitacijska potencialna energija je shranjena energija zaradi višine. Formula je Wp = mgh, kjer je g težni pospešek . Knjiga na polici ima potencialno energijo - če pade, se ta pretvori v kinetično.
Potencialna energija - shranjena energija
Potencialna energija je kot naloženi akumulator. Najbolj pogosta je gravitacijska potencialna energija, ki jo ima vsako telo zaradi svoje višine nad tlemi.
Formula Wp = mgh ti pove, da je odvisna od mase, višine in težnega pospeška. Višino vedno merimo od neke ničelne ravnine - ponavadi so to tla.
Prožnostna potencialna energija nastane, ko stisnemo ali raztegnemo prožno telo. Predstavljaj si napeto elastiko ali stisnjen trampolik. Formula je Wpr = kx²/2, kjer je k konstanta prožnosti (kako "trda" je vzmet).
💡 Pomembno: Potencialna energija se lahko "sprosti" in pretvori v kinetično - tako deluje katapult!
Najboljši primer pretvorbe energij je padajoča žoga. Na vrhu ima največ potencialne energije, med padanjem se ta spreminja v kinetično, tik pred tlemi pa ima največ kinetične energije.
Notranja energija in primerjava oblik
Notranja energija je kot skrivnostna energija v snovi. To je skupna energija vseh drobnih delcev (atomov, molekul), ki sestavljajo telo. Ti delci se nenehno gibljejo in delujejo drug na drugega.
Višja kot je temperatura, hitreje se delci gibljejo in večja je notranja energija. Skodelica vročega čaja ima več notranje energije kot mrzla voda.
Primerjava glavnih oblik energije ti pomaga razumeti razlike:
- Kinetična: odvisna od mase in hitrosti (vozeč avto)
- Potencialna: odvisna od mase in višine (jabolko na drevesu)
- Prožnostna: odvisna od konstante prožnosti in raztezka (napeta frača)
💡 Ključni koncept: Mehanska energija se ohranja, če ni trenja!
Zakon o ohranitvi energije pomeni, da se energija le preoblači. Pri prostem padu se potencialna spreminja v kinetično, pri metu navzgor pa obratno.
Rešeni primeri za boljše razumevanje
Primer kinetične energije: Motorist (80 kg) z motorjem (120 kg) vozi s hitrostjo 54 km/h. Najprej pretvoriš hitrost: 54 ÷ 3,6 = 15 m/s. Skupna masa je 200 kg.
Uporabiš formulo Wk = mv²/2 = 200 × 15² ÷ 2 = 22.500 J. Torej 22,5 kJ kinetične energije - to je kar veliko!
Primer potencialne energije: Planinec (70 kg) se povzpne 500 m višje. Uporabiš Wp = mgh = 70 × 10 × 500 = 350.000 J. To je 350 kJ dodatne potencialne energije.
💡 Praktični nasvet: Vedno najprej zapiši podatke, nato izberi formulo in preveri enote!
Pretvorba energije: Kamen (2 kg) pade z 20 m višine. Na vrhu ima samo Wp, spodaj samo Wk. Velja mgh = mv²/2, zato v = √(2gh) = √(400) = 20 m/s.
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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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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
Različne vrste energije in njihova uporaba
Energija je ena od najpomembnejših fizikalnih količin - pravzaprav je to sposobnost, da opravljamo delo. Predstavljaj si jo kot "goriva" za vse, kar se dogaja okoli nas - od vožnje s kolesom do padanja jabolk z drevesa. Najbolj kul pa... Show more
Uvod v energijo in ključni pojmi
Energija je kot supermoč - to je sposobnost telesa, da opravi delo. Brez nje se ne bi nič premikalo, ne bi bilo svetlobe ali toplote. Najvažnejše pravilo: energije ne moremo ustvariti ali uničiti, lahko jo samo pretvarjamo iz ene oblike v drugo.
Osnovna enota za energijo je džul (J) - ista enota, kot jo uporabljamo za delo. To ni naključje! Opravljeno delo je namreč enako spremembi energije.
Poznamo več vrst energije. Kinetična energija je energija gibanja - vsako telo, ki se premika, jo ima. Potencialna energija je "shranjena" energija zaradi lege ali oblike. Notranja energija pa je vsota energije vseh drobnih delcev v telesu in je povezana s temperaturo.
💡 Zakon o ohranitvi energije pomeni, da se skupna količina energije v zaprtem sistemu nikoli ne spremeni!
Sign up to see the contentIt's free!
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Kinetična energija - energija gibanja
Vsako gibanje pomeni kinetično energijo. Več kot ima telo mase in hitreje kot se giblje, več kinetične energije ima. Formula je preprosta: Wk = mv²/2.
Pri tej formuli pazi na dva ključna dela. Masa mora biti v kilogramih, hitrost pa obvezno v m/s . Če imaš hitrost v km/h, jo deli s 3,6.
Še pomembneje - hitrost je v formuli na kvadrat. To pomeni, da če se hitrost podvoji, se kinetična energija početveri! Zato so hitre vožnje tako nevarne.
💡 Hitri trik za pretvarjanje: 90 km/h ÷ 3,6 = 25 m/s
Gravitacijska potencialna energija je shranjena energija zaradi višine. Formula je Wp = mgh, kjer je g težni pospešek . Knjiga na polici ima potencialno energijo - če pade, se ta pretvori v kinetično.
Sign up to see the contentIt's free!
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Potencialna energija - shranjena energija
Potencialna energija je kot naloženi akumulator. Najbolj pogosta je gravitacijska potencialna energija, ki jo ima vsako telo zaradi svoje višine nad tlemi.
Formula Wp = mgh ti pove, da je odvisna od mase, višine in težnega pospeška. Višino vedno merimo od neke ničelne ravnine - ponavadi so to tla.
Prožnostna potencialna energija nastane, ko stisnemo ali raztegnemo prožno telo. Predstavljaj si napeto elastiko ali stisnjen trampolik. Formula je Wpr = kx²/2, kjer je k konstanta prožnosti (kako "trda" je vzmet).
💡 Pomembno: Potencialna energija se lahko "sprosti" in pretvori v kinetično - tako deluje katapult!
Najboljši primer pretvorbe energij je padajoča žoga. Na vrhu ima največ potencialne energije, med padanjem se ta spreminja v kinetično, tik pred tlemi pa ima največ kinetične energije.
Sign up to see the contentIt's free!
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Notranja energija in primerjava oblik
Notranja energija je kot skrivnostna energija v snovi. To je skupna energija vseh drobnih delcev (atomov, molekul), ki sestavljajo telo. Ti delci se nenehno gibljejo in delujejo drug na drugega.
Višja kot je temperatura, hitreje se delci gibljejo in večja je notranja energija. Skodelica vročega čaja ima več notranje energije kot mrzla voda.
Primerjava glavnih oblik energije ti pomaga razumeti razlike:
- Kinetična: odvisna od mase in hitrosti (vozeč avto)
- Potencialna: odvisna od mase in višine (jabolko na drevesu)
- Prožnostna: odvisna od konstante prožnosti in raztezka (napeta frača)
💡 Ključni koncept: Mehanska energija se ohranja, če ni trenja!
Zakon o ohranitvi energije pomeni, da se energija le preoblači. Pri prostem padu se potencialna spreminja v kinetično, pri metu navzgor pa obratno.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rešeni primeri za boljše razumevanje
Primer kinetične energije: Motorist (80 kg) z motorjem (120 kg) vozi s hitrostjo 54 km/h. Najprej pretvoriš hitrost: 54 ÷ 3,6 = 15 m/s. Skupna masa je 200 kg.
Uporabiš formulo Wk = mv²/2 = 200 × 15² ÷ 2 = 22.500 J. Torej 22,5 kJ kinetične energije - to je kar veliko!
Primer potencialne energije: Planinec (70 kg) se povzpne 500 m višje. Uporabiš Wp = mgh = 70 × 10 × 500 = 350.000 J. To je 350 kJ dodatne potencialne energije.
💡 Praktični nasvet: Vedno najprej zapiši podatke, nato izberi formulo in preveri enote!
Pretvorba energije: Kamen (2 kg) pade z 20 m višine. Na vrhu ima samo Wp, spodaj samo Wk. Velja mgh = mv²/2, zato v = √(2gh) = √(400) = 20 m/s.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
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
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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