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Learn Forces and Motion: Calculate and Understand with Simple Physics!
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Advanced Concepts in Forces and Motion
This page delves deeper into the physics of forces and motion, introducing concepts such as pivots, levers, and moments, as well as providing essential equations for various physical quantities.
Pivots and Levers
The concept of moments is introduced in relation to pivots and levers.
Definition: The turning effect of a force around a pivot or fulcrum is called the 'moment'.
Highlight: The size of a moment, measured in Newton-meters (Nm), depends on the force applied and the distance from the pivot to the point of force application.
Example: The equation for calculating the size of a moment is: Moment = Force × Distance from pivot
Force and Weight
The relationship between force, mass, and weight is explained.
Highlight: The size of gravitational force depends on mass.
Example: The equation for weight is: Weight = Mass × Gravitational field strength
Speed and Units
The concept of speed and its measurement are discussed.
Definition: Speed is calculated using the equation: Speed = Distance ÷ Time
Vocabulary: Common units for speed include miles per hour, kilometers per hour, and meters per second.
Mass and Weight Measurement
The distinction between mass and weight measurement is clarified.
Highlight: Mass is measured on a balance in kilograms (kg), while weight is measured with a newton meter in Newtons (N).
Levers and Gears
The practical applications of levers and gears are introduced.
Definition: Levers and gears are used to transmit the rotational effect of a force from one place to another.
Highlight: Using a lever allows for the application of less force to achieve the same moment, demonstrating the principle of mechanical advantage.
Forces and Motion in Physics
This page introduces fundamental concepts in physics related to forces and motion. It covers key terms, equations, and principles that are essential for understanding how objects move and interact.
Resultant Force
The resultant force is a crucial concept in physics. When an object is in equilibrium, the resultant force is zero. Free body diagrams are used to calculate resultant forces.
Definition: A resultant force causes acceleration, which can be calculated using Newton's second law.
Highlight: How to calculate resultant force using Newton's second law: Force = mass (m) × acceleration (a)
Relative Motion
Relative motion describes the speed of an object in comparison to an observer.
Example: The equation for relative motion is the difference between the fastest and slowest speeds if objects move in the same direction, or the sum of speeds if they move in opposite directions.
Friction and Resistance
Friction, particularly air resistance, plays a significant role in slowing down moving objects.
Vocabulary: Streamlining is the process of shaping an object to minimize air or water resistance.
Highlight: Reducing air and water resistance through streamlining makes objects more aerodynamic, allowing them to move through air and water more efficiently.
Distance-Time Graphs
Distance-time graphs are visual representations of an object's motion over time.
Definition: In a distance-time graph, the x-axis represents time , and the y-axis represents distance (usually in meters).
Highlight: Understanding distance-time graphs in physics is crucial for interpreting motion. A straight line indicates constant speed, a horizontal line shows a stationary object, and a curve represents changing speed.
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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
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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
Learn Forces and Motion: Calculate and Understand with Simple Physics!
tae.ml<3
@.nurss0
This document covers key physics concepts related to forces, motion, and mechanics. It provides essential equations, definitions, and explanations for students studying these topics. Understanding distance-time graphs in physics and how to calculate resultant force using Newton's second laware... Show more
Advanced Concepts in Forces and Motion
This page delves deeper into the physics of forces and motion, introducing concepts such as pivots, levers, and moments, as well as providing essential equations for various physical quantities.
Pivots and Levers
The concept of moments is introduced in relation to pivots and levers.
Definition: The turning effect of a force around a pivot or fulcrum is called the 'moment'.
Highlight: The size of a moment, measured in Newton-meters (Nm), depends on the force applied and the distance from the pivot to the point of force application.
Example: The equation for calculating the size of a moment is: Moment = Force × Distance from pivot
Force and Weight
The relationship between force, mass, and weight is explained.
Highlight: The size of gravitational force depends on mass.
Example: The equation for weight is: Weight = Mass × Gravitational field strength
Speed and Units
The concept of speed and its measurement are discussed.
Definition: Speed is calculated using the equation: Speed = Distance ÷ Time
Vocabulary: Common units for speed include miles per hour, kilometers per hour, and meters per second.
Mass and Weight Measurement
The distinction between mass and weight measurement is clarified.
Highlight: Mass is measured on a balance in kilograms (kg), while weight is measured with a newton meter in Newtons (N).
Levers and Gears
The practical applications of levers and gears are introduced.
Definition: Levers and gears are used to transmit the rotational effect of a force from one place to another.
Highlight: Using a lever allows for the application of less force to achieve the same moment, demonstrating the principle of mechanical advantage.
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
Forces and Motion in Physics
This page introduces fundamental concepts in physics related to forces and motion. It covers key terms, equations, and principles that are essential for understanding how objects move and interact.
Resultant Force
The resultant force is a crucial concept in physics. When an object is in equilibrium, the resultant force is zero. Free body diagrams are used to calculate resultant forces.
Definition: A resultant force causes acceleration, which can be calculated using Newton's second law.
Highlight: How to calculate resultant force using Newton's second law: Force = mass (m) × acceleration (a)
Relative Motion
Relative motion describes the speed of an object in comparison to an observer.
Example: The equation for relative motion is the difference between the fastest and slowest speeds if objects move in the same direction, or the sum of speeds if they move in opposite directions.
Friction and Resistance
Friction, particularly air resistance, plays a significant role in slowing down moving objects.
Vocabulary: Streamlining is the process of shaping an object to minimize air or water resistance.
Highlight: Reducing air and water resistance through streamlining makes objects more aerodynamic, allowing them to move through air and water more efficiently.
Distance-Time Graphs
Distance-time graphs are visual representations of an object's motion over time.
Definition: In a distance-time graph, the x-axis represents time , and the y-axis represents distance (usually in meters).
Highlight: Understanding distance-time graphs in physics is crucial for interpreting motion. A straight line indicates constant speed, a horizontal line shows a stationary object, and a curve represents changing speed.
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and 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
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