Subjects
Careers
Maths
Chemistry
Biology
English Lang.
History
Energy transfers (a2 only)
Infection and response
Homeostasis and response
Responding to change (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
The control of gene expression (a2 only)
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Ecology
Cells
Show all topics
World war two & the holocaust
2m wars and welfare: britain in transition, 1906-1957
1f industrialisation and the people: britain, c1783-1885
Medieval period: 1066 -1509
1l the quest for political stability: germany, 1871-1991
Britain & the wider world: 1745 -1901
2d religious conflict and the church in england, c1529-c1570
The cold war
1c the tudors: england, 1485-1603
Inter-war germany
2j america: a nation divided, c1845-1877
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
Show all topics
15
0
Emma Corden
05/01/2023
Physics
forces in action
Newton's Second Law of Motion and Fluid Mechanics: A Comprehensive Guide
This guide covers key concepts in physics, including Newton's 2nd law of motion, forces, free body diagrams, motion in fluids, moments, and pressure. It provides detailed explanations, examples, and practical investigations to help students understand these fundamental principles.
05/01/2023
433
This page covers free body diagrams and provides examples of force analysis in various scenarios.
Key concepts:
Highlight: When drawing free body diagrams, always use arrows to scale and a dot to represent the object.
Example: In the helicopter example, when the load experiences acceleration, the tension in the cable increases from 981N to 1081N.
This page describes a practical investigation of motion in fluid and introduces forces on a slope.
Key points:
Vocabulary: Terminal velocity is the constant speed reached by an object falling through a fluid when the drag force equals the gravitational force.
Definition: The center of gravity is the point at which the entire weight of an object seems to act.
This page introduces the concept of moments and provides examples of force analysis using trigonometry.
Key points:
Definition: A moment is the turning effect of a force, calculated as the product of the force and the perpendicular distance from the pivot to the line of action of the force.
Example: For a force of 6N applied 0.1m from a pivot, the moment is 0.5 Nm.
This page explains the principle of moments and introduces force couples and torques.
Key concepts:
Definition: The principle of moments states that for an object in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments.
Vocabulary: A force couple consists of two equal and opposite forces acting in the same plane, creating a pure rotational effect.
This page covers pressure in fluids and introduces Archimedes' Principle.
Key points:
Definition: Archimedes' Principle states that the upthrust acting on a body submerged in a liquid is equal to the weight of the liquid that has been displaced.
Formula: Pressure in a fluid is given by P = ρgh, where ρ is density, g is gravitational acceleration, and h is depth.
This page provides practice questions on moments and their solutions.
Key points:
Example: For a force of 5N applied at a 30° angle to a 0.2m lever arm, the moment is calculated as 5 × 0.1 = 0.5 Nm.
Highlight: When solving moment problems, always identify the perpendicular distance from the pivot to the line of action of the force.
This page continues with more practice problems on moments and their detailed solutions.
Key points:
Example: In a balanced beam problem, the unknown weight is calculated to be 164 N, corresponding to a mass of 16.7 kg.
Highlight: When solving equilibrium problems, always equate the sum of clockwise moments to the sum of anticlockwise moments.
Average app rating
Pupils love Knowunity
In education app charts in 17 countries
Students have uploaded notes
iOS User
Philip, iOS User
Lena, iOS user
Emma Corden
@emmacorden_rpll
Newton's Second Law of Motion and Fluid Mechanics: A Comprehensive Guide
This guide covers key concepts in physics, including Newton's 2nd law of motion, forces, free body diagrams, motion in fluids, moments, and pressure. It provides detailed explanations, examples,... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page covers free body diagrams and provides examples of force analysis in various scenarios.
Key concepts:
Highlight: When drawing free body diagrams, always use arrows to scale and a dot to represent the object.
Example: In the helicopter example, when the load experiences acceleration, the tension in the cable increases from 981N to 1081N.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page describes a practical investigation of motion in fluid and introduces forces on a slope.
Key points:
Vocabulary: Terminal velocity is the constant speed reached by an object falling through a fluid when the drag force equals the gravitational force.
Definition: The center of gravity is the point at which the entire weight of an object seems to act.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page introduces the concept of moments and provides examples of force analysis using trigonometry.
Key points:
Definition: A moment is the turning effect of a force, calculated as the product of the force and the perpendicular distance from the pivot to the line of action of the force.
Example: For a force of 6N applied 0.1m from a pivot, the moment is 0.5 Nm.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page explains the principle of moments and introduces force couples and torques.
Key concepts:
Definition: The principle of moments states that for an object in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments.
Vocabulary: A force couple consists of two equal and opposite forces acting in the same plane, creating a pure rotational effect.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page covers pressure in fluids and introduces Archimedes' Principle.
Key points:
Definition: Archimedes' Principle states that the upthrust acting on a body submerged in a liquid is equal to the weight of the liquid that has been displaced.
Formula: Pressure in a fluid is given by P = ρgh, where ρ is density, g is gravitational acceleration, and h is depth.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page provides practice questions on moments and their solutions.
Key points:
Example: For a force of 5N applied at a 30° angle to a 0.2m lever arm, the moment is calculated as 5 × 0.1 = 0.5 Nm.
Highlight: When solving moment problems, always identify the perpendicular distance from the pivot to the line of action of the force.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page continues with more practice problems on moments and their detailed solutions.
Key points:
Example: In a balanced beam problem, the unknown weight is calculated to be 164 N, corresponding to a mass of 16.7 kg.
Highlight: When solving equilibrium problems, always equate the sum of clockwise moments to the sum of anticlockwise moments.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page introduces Newton's second law of motion, which states that the net force acting on an object is equal to its mass multiplied by its acceleration .
Key points:
Definition: Newton's second law of motion states that F = ma, where F is the net force, m is mass, and a is acceleration.
Example: For a constant mass, if two forces of 2N upward and 1N downward are applied, the net force is 1N upward.
Vocabulary: Normal force is the force exerted by a surface on an object in contact with it, always perpendicular to the surface.
App 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
