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17
1
C
CF
8/11/2025
Physics
Physics Moments
251
•
Aug 11, 2025
•
Easy Guide to Moments: Balance, Forces, and How They Work
C
CF
@revision_
The Principle of Moments and Centre of Gravity
This page delves deeper into the equilibrium principle of moments and introduces the concept of centre of gravity.
Definition: The principle of moments states that when a body is in equilibrium (balanced), the sum of clockwise moments about a point is equal to the sum of anti-clockwise moments.
This principle is crucial for understanding balance and is often expressed using the formula:
Clockwise moments = Anti-clockwise moments
Vocabulary: The centre of gravity is a point at which the weight of an object appears to act.
Understanding the centre of gravity is essential for analyzing the stability of objects and systems. It plays a crucial role in various fields, including engineering, architecture, and sports.
Example: In a seesaw, the principle of moments explains why two people of different weights can balance by sitting at different distances from the pivot point.
The concept of centre of gravity is particularly important when dealing with complex shapes or systems where weight distribution is not uniform.
Moments: Questions for Review
This page presents a series of questions designed to test and reinforce understanding of the key concepts related to moments and equilibrium.
- What is the unit for moments?
- What two factors determine the size of a moment?
- What happens if the force increases?
- What is the principle of moments?
- What is the formula for moments?
- What is the centre of gravity?
These questions cover the essential aspects of how to calculate moment of force, the equilibrium principle of moments, and the concept of centre of gravity. They serve as a valuable tool for self-assessment and review of the material covered in the previous pages.
Highlight: Regularly reviewing and answering such questions can significantly improve understanding and retention of these important physics concepts.
Moments: Answers and Explanations
This final page provides answers to the questions posed on the previous page, offering further clarification and reinforcement of the key concepts related to moments and equilibrium.
-
The unit for moments is newton metres (Nm).
-
The size of a moment depends on two factors:
- The distance from the pivot
- The size of the force
-
If the force increases, the size of the moment increases while the distance remains constant.
Definition: The principle of moments states that when a body is in equilibrium (balanced), the sum of clockwise moments is equal to the sum of anti-clockwise moments about any point.
-
The formula for moments is: Moment = Force × perpendicular distance
-
The centre of gravity is defined as the point at which the weight of an object appears to act.
Highlight: Understanding these concepts is crucial for solving problems involving rotational forces, balance, and stability in various physical systems.
These answers provide a comprehensive review of the key points covered in the guide, reinforcing the understanding of how to calculate moment of force, the equilibrium principle of moments, and the importance of centre of gravity in physics and engineering applications.
Understanding Moments and Equilibrium
The concept of moments is fundamental in physics, particularly when dealing with rotational forces and balance. This page introduces the basic principles and units involved in understanding moments.
Vocabulary: A moment is the turning effect of a force, measured in newton metres (Nm).
The formula for calculating a moment is:
Moment = Force × perpendicular distance
Highlight: Two key factors determine the size of a moment: the magnitude of the force and its distance from the pivot point.
For an object to rotate or turn, there must be a pivot or fulcrum. The relationship between force, distance, and moment is crucial:
- If the force increases while the distance remains constant, the size of the moment increases.
- If the distance of the force from the pivot decreases while the force remains constant, the size of the moment decreases.
Understanding these relationships is essential for analyzing rotational motion and balance in various systems.
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?
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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 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 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 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 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
Easy Guide to Moments: Balance, Forces, and How They Work
C
CF
@revision_
The equilibrium principle of moments is a fundamental concept in physics that explains how forces balance around a pivot point. This principle is crucial for understanding rotational motion and stability in various systems. The guide covers key aspects such as ... Show more
The Principle of Moments and Centre of Gravity
This page delves deeper into the equilibrium principle of moments and introduces the concept of centre of gravity.
Definition: The principle of moments states that when a body is in equilibrium (balanced), the sum of clockwise moments about a point is equal to the sum of anti-clockwise moments.
This principle is crucial for understanding balance and is often expressed using the formula:
Clockwise moments = Anti-clockwise moments
Vocabulary: The centre of gravity is a point at which the weight of an object appears to act.
Understanding the centre of gravity is essential for analyzing the stability of objects and systems. It plays a crucial role in various fields, including engineering, architecture, and sports.
Example: In a seesaw, the principle of moments explains why two people of different weights can balance by sitting at different distances from the pivot point.
The concept of centre of gravity is particularly important when dealing with complex shapes or systems where weight distribution is not uniform.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Moments: Questions for Review
This page presents a series of questions designed to test and reinforce understanding of the key concepts related to moments and equilibrium.
- What is the unit for moments?
- What two factors determine the size of a moment?
- What happens if the force increases?
- What is the principle of moments?
- What is the formula for moments?
- What is the centre of gravity?
These questions cover the essential aspects of how to calculate moment of force, the equilibrium principle of moments, and the concept of centre of gravity. They serve as a valuable tool for self-assessment and review of the material covered in the previous pages.
Highlight: Regularly reviewing and answering such questions can significantly improve understanding and retention of these important physics concepts.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Moments: Answers and Explanations
This final page provides answers to the questions posed on the previous page, offering further clarification and reinforcement of the key concepts related to moments and equilibrium.
-
The unit for moments is newton metres (Nm).
-
The size of a moment depends on two factors:
- The distance from the pivot
- The size of the force
-
If the force increases, the size of the moment increases while the distance remains constant.
Definition: The principle of moments states that when a body is in equilibrium (balanced), the sum of clockwise moments is equal to the sum of anti-clockwise moments about any point.
-
The formula for moments is: Moment = Force × perpendicular distance
-
The centre of gravity is defined as the point at which the weight of an object appears to act.
Highlight: Understanding these concepts is crucial for solving problems involving rotational forces, balance, and stability in various physical systems.
These answers provide a comprehensive review of the key points covered in the guide, reinforcing the understanding of how to calculate moment of force, the equilibrium principle of moments, and the importance of centre of gravity in physics and engineering applications.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Understanding Moments and Equilibrium
The concept of moments is fundamental in physics, particularly when dealing with rotational forces and balance. This page introduces the basic principles and units involved in understanding moments.
Vocabulary: A moment is the turning effect of a force, measured in newton metres (Nm).
The formula for calculating a moment is:
Moment = Force × perpendicular distance
Highlight: Two key factors determine the size of a moment: the magnitude of the force and its distance from the pivot point.
For an object to rotate or turn, there must be a pivot or fulcrum. The relationship between force, distance, and moment is crucial:
- If the force increases while the distance remains constant, the size of the moment increases.
- If the distance of the force from the pivot decreases while the force remains constant, the size of the moment decreases.
Understanding these relationships is essential for analyzing rotational motion and balance in various systems.
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.
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
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 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 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 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 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