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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
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2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
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Physics
20 Dec 2025
142
2 pages
Yasmina Taleb Medarova @yasminatalebmedarova_ipfc
Ever wondered why scientists worldwide can understand each other's measurements? It's all thanks to the SI unit system... Show more
Physics revolves around seven base SI units that form the foundation of all measurements. These include metres for length, seconds for time, kilograms for mass, and kelvin for temperature - units you'll use constantly in calculations.
Derived units are combinations of base units that measure specific physical quantities. For instance, newtons measure force, joules measure energy, and watts measure power. Think of them as recipes made from the basic ingredients of base units.
The Greek alphabet isn't just ancient history - it's essential for physics! You'll encounter theta (θ) for angles, lambda (λ) for wavelength, and omega (Ω) for electrical resistance. Learning these symbols now will make your physics equations much clearer.
Quick Tip Don't try to memorise all Greek letters at once - learn them as you encounter them in different physics topics!
Metric prefixes are your best friends for handling enormous or tiny numbers in physics. From tera (10¹²) down to pico (10⁻¹²), these prefixes help you express everything from the distance to stars to the size of atoms without writing endless zeros.
The most common prefixes you'll use are kilo (×1000), centi (÷100), and milli (÷1000). Remember that when units with the same power are divided, they cancel out completely - leaving you with a simple ratio.
Converting between units becomes straightforward once you understand the pattern. A kilometre contains 1000 metres, whilst a millimetre is 0.001 metres. The prefixes work the same way whether you're measuring length, mass, or volume.
Exam Success Practice converting between different prefixes daily - it's guaranteed to appear on your physics papers!
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
2
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore detailed solutions for the OCR A Level Physics June 2022 Paper 2. This resource covers key concepts such as radioactive decay, electric circuits, electromagnetic induction, and the photoelectric effect. Ideal for exam preparation and understanding complex physics principles.
PhysicsExplore detailed solutions for the OCR A Level Physics Paper 2 from November 2021. This resource covers key concepts such as capacitors, wave properties, electric circuits, and nuclear physics, providing step-by-step explanations and calculations for each question. Ideal for students preparing for exams and seeking to enhance their understanding of complex physics topics.
PhysicsExplore detailed solutions to the OCR A Level Physics Paper 3 from June 2017. This resource covers key concepts such as Ohm's Law, RC circuits, elastic potential energy, tension forces, simple harmonic motion, circuit analysis, capacitors, magnetic fields, and more. Ideal for students preparing for exams, this comprehensive guide provides step-by-step explanations and calculations for each question.
PhysicsExplore the fundamentals of power in electrical circuits, including key formulas (P = E/t, P = VI) and the differences between series and parallel configurations. This summary covers energy transfer, voltage distribution, and current behavior in various circuit setups, making it essential for A-Level Physics students.
PhysicsDive into the fundamentals of electricity with this comprehensive overview covering key concepts such as Ohm's Law, voltage, current, resistance, and circuit analysis. Ideal for A Level Physics students, this resource provides clear explanations and examples of series and parallel circuits, resistivity, and power calculations. Enhance your understanding of electrical circuits and prepare for your exams effectively.
PhysicsExplore the core concepts of electricity, including electric current, potential difference, resistance, and resistivity. This summary covers key formulas and the relationship between temperature and resistance, making it essential for A-Level Physics students. Ideal for quick revision or exam preparation.
PhysicsApp Store
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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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
Yasmina Taleb Medarova
@yasminatalebmedarova_ipfc
Ever wondered why scientists worldwide can understand each other's measurements? It's all thanks to the SI unit system - a universal language of measurement that makes physics calculations possible. Plus, you'll need to master Greek letters and metric prefixes to... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Physics revolves around seven base SI units that form the foundation of all measurements. These include metres for length, seconds for time, kilograms for mass, and kelvin for temperature - units you'll use constantly in calculations.
Derived units are combinations of base units that measure specific physical quantities. For instance, newtons measure force, joules measure energy, and watts measure power. Think of them as recipes made from the basic ingredients of base units.
The Greek alphabet isn't just ancient history - it's essential for physics! You'll encounter theta (θ) for angles, lambda (λ) for wavelength, and omega (Ω) for electrical resistance. Learning these symbols now will make your physics equations much clearer.
Quick Tip: Don't try to memorise all Greek letters at once - learn them as you encounter them in different physics topics!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Metric prefixes are your best friends for handling enormous or tiny numbers in physics. From tera (10¹²) down to pico (10⁻¹²), these prefixes help you express everything from the distance to stars to the size of atoms without writing endless zeros.
The most common prefixes you'll use are kilo (×1000), centi (÷100), and milli (÷1000). Remember that when units with the same power are divided, they cancel out completely - leaving you with a simple ratio.
Converting between units becomes straightforward once you understand the pattern. A kilometre contains 1000 metres, whilst a millimetre is 0.001 metres. The prefixes work the same way whether you're measuring length, mass, or volume.
Exam Success: Practice converting between different prefixes daily - it's guaranteed to appear on your physics papers!
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
2
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore detailed solutions for the OCR A Level Physics June 2022 Paper 2. This resource covers key concepts such as radioactive decay, electric circuits, electromagnetic induction, and the photoelectric effect. Ideal for exam preparation and understanding complex physics principles.
PhysicsExplore detailed solutions for the OCR A Level Physics Paper 2 from November 2021. This resource covers key concepts such as capacitors, wave properties, electric circuits, and nuclear physics, providing step-by-step explanations and calculations for each question. Ideal for students preparing for exams and seeking to enhance their understanding of complex physics topics.
PhysicsExplore detailed solutions to the OCR A Level Physics Paper 3 from June 2017. This resource covers key concepts such as Ohm's Law, RC circuits, elastic potential energy, tension forces, simple harmonic motion, circuit analysis, capacitors, magnetic fields, and more. Ideal for students preparing for exams, this comprehensive guide provides step-by-step explanations and calculations for each question.
PhysicsExplore the fundamentals of power in electrical circuits, including key formulas (P = E/t, P = VI) and the differences between series and parallel configurations. This summary covers energy transfer, voltage distribution, and current behavior in various circuit setups, making it essential for A-Level Physics students.
PhysicsDive into the fundamentals of electricity with this comprehensive overview covering key concepts such as Ohm's Law, voltage, current, resistance, and circuit analysis. Ideal for A Level Physics students, this resource provides clear explanations and examples of series and parallel circuits, resistivity, and power calculations. Enhance your understanding of electrical circuits and prepare for your exams effectively.
PhysicsExplore the core concepts of electricity, including electric current, potential difference, resistance, and resistivity. This summary covers key formulas and the relationship between temperature and resistance, making it essential for A-Level Physics students. Ideal for quick revision or exam preparation.
PhysicsApp Store
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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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
Sociology