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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
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2s the making of modern britain, 1951-2007
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Physics
10 Dec 2025
303
1 page
Jasmine @jasmine_rhdg
Pressure is everywhere around us - from the air pressing on your skin to the water pushing against... Show more
Pressure is simply the amount of force acting on each square metre of a surface. Think of it like this if you press your hand flat against a wall, you're creating pressure. The formula is straightforward pressure = force ÷ area.
This explains why a sharp knife cuts better than a blunt one - the same force is concentrated over a much smaller area, creating much higher pressure. We measure pressure in pascals (Pa), where 1 pascal equals 1 newton per square metre.
Fluids (liquids and gases) create pressure because their tiny particles constantly bounce around and collide with surfaces. This creates a force, and when spread over an area, gives us pressure.
Key Point The smaller the area, the greater the pressure for the same amount of force - that's why high heels can damage floors whilst trainers don't!
Fluid pressure has some fascinating properties that affect our daily lives. Most importantly, pressure in fluids acts equally in all directions - not just downwards like you might expect.
Pressure increases with depth because there's more fluid weight pressing down from above. This is why your ears hurt when diving deep into a swimming pool. The deeper you go, the more water is pushing down on you.
Fluid density also matters hugely. Oil is less dense than water, so at the same depth, water creates more pressure than oil. This is why oil floats on water.
The mathematical relationship is pressure = height × density × gravitational field strength, or P = hρg. This formula helps engineers design everything from dams to submarines.
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.
18
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore key concepts in physics with this detailed overview of Forces and Energy Changes. This resource covers essential topics such as Elastic Potential Energy, Hooke's Law, Work Done, Mass and Weight, and Gravitational Potential Energy. Ideal for students preparing for exams or seeking to deepen their understanding of these fundamental principles.
PhysicsComprehensive equation sheet for AQA GCSE Physics covering key topics such as work and energy, kinematic equations, momentum, and wave properties. Essential for exam preparation, this resource includes all necessary formulas and those provided in the exam. Perfect for students aiming to master the physics curriculum.
PhysicsExplore the various energy stores and the mechanisms of energy transfer, including kinetic and potential energy, work done, and the principles of closed systems. This summary covers key concepts such as energy types, energy conservation, and practical examples of energy transfer in systems.
PhysicsExplore the principles of Hooke's Law, including the calculation of spring constants and elastic potential energy. This summary covers key concepts such as elastic deformation, inelastic deformation, and the limit of proportionality, essential for GCSE Physics students. Learn how to apply formulas to solve problems related to forces and elasticity.
PhysicsExplore key concepts in forces and motion with this active recall resource. Covering topics such as Newton's Laws, vector and scalar quantities, acceleration, momentum, and the effects of forces on motion, this study material is designed to enhance your understanding and retention for GCSE Physics. Ideal for exam preparation and quick revision.
PhysicsComprehensive revision material for Physics Paper 1 covering key concepts such as resistance in circuits, energy transfers, atomic structure, and practical applications. This resource includes detailed explanations of Ohm's Law, energy systems, and circuit analysis, making it ideal for exam preparation.
PhysicsQuotes from every main character
English LiteratureApp 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
Jasmine
@jasmine_rhdg
Pressure is everywhere around us - from the air pressing on your skin to the water pushing against a submarine's hull. Understanding how pressure works helps explain why your ears pop on aeroplanes and how hydraulic machines can lift massive... Show more
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Pressure is simply the amount of force acting on each square metre of a surface. Think of it like this: if you press your hand flat against a wall, you're creating pressure. The formula is straightforward: pressure = force ÷ area.
This explains why a sharp knife cuts better than a blunt one - the same force is concentrated over a much smaller area, creating much higher pressure. We measure pressure in pascals (Pa), where 1 pascal equals 1 newton per square metre.
Fluids (liquids and gases) create pressure because their tiny particles constantly bounce around and collide with surfaces. This creates a force, and when spread over an area, gives us pressure.
Key Point: The smaller the area, the greater the pressure for the same amount of force - that's why high heels can damage floors whilst trainers don't!
Fluid pressure has some fascinating properties that affect our daily lives. Most importantly, pressure in fluids acts equally in all directions - not just downwards like you might expect.
Pressure increases with depth because there's more fluid weight pressing down from above. This is why your ears hurt when diving deep into a swimming pool. The deeper you go, the more water is pushing down on you.
Fluid density also matters hugely. Oil is less dense than water, so at the same depth, water creates more pressure than oil. This is why oil floats on water.
The mathematical relationship is: pressure = height × density × gravitational field strength, or P = hρg. This formula helps engineers design everything from dams to submarines.
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.
18
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore key concepts in physics with this detailed overview of Forces and Energy Changes. This resource covers essential topics such as Elastic Potential Energy, Hooke's Law, Work Done, Mass and Weight, and Gravitational Potential Energy. Ideal for students preparing for exams or seeking to deepen their understanding of these fundamental principles.
PhysicsComprehensive equation sheet for AQA GCSE Physics covering key topics such as work and energy, kinematic equations, momentum, and wave properties. Essential for exam preparation, this resource includes all necessary formulas and those provided in the exam. Perfect for students aiming to master the physics curriculum.
PhysicsExplore the various energy stores and the mechanisms of energy transfer, including kinetic and potential energy, work done, and the principles of closed systems. This summary covers key concepts such as energy types, energy conservation, and practical examples of energy transfer in systems.
PhysicsExplore the principles of Hooke's Law, including the calculation of spring constants and elastic potential energy. This summary covers key concepts such as elastic deformation, inelastic deformation, and the limit of proportionality, essential for GCSE Physics students. Learn how to apply formulas to solve problems related to forces and elasticity.
PhysicsExplore key concepts in forces and motion with this active recall resource. Covering topics such as Newton's Laws, vector and scalar quantities, acceleration, momentum, and the effects of forces on motion, this study material is designed to enhance your understanding and retention for GCSE Physics. Ideal for exam preparation and quick revision.
PhysicsComprehensive revision material for Physics Paper 1 covering key concepts such as resistance in circuits, energy transfers, atomic structure, and practical applications. This resource includes detailed explanations of Ohm's Law, energy systems, and circuit analysis, making it ideal for exam preparation.
PhysicsQuotes from every main character
English LiteratureApp 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