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Updated 8 Mar 2026
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Biomechanics might sound complicated, but it's just the physics behind... Show more
Biomechanics is essentially physics applied to human movement. It explains why some techniques work brilliantly whilst others fall flat, and it's your key to understanding how athletes can move more efficiently and safely.
The fundamental concepts you need to master include force (any push or pull measured in Newtons), motion (which comes in three types: linear like sprinting, angular like swinging a hurley, and general motion combining both), and velocity (speed with direction). Acceleration tells us how quickly velocity changes, whilst momentum combines mass and velocity to show how much "oomph" a moving object has.
Your centre of mass is your body's theoretical balance point – usually around your navel when standing still. Stability is your ability to resist being moved or to return to your original position. These concepts work together to explain every sporting movement you'll ever see.
Key Point: Don't just memorise definitions – think about how you see these principles in action during your favourite sports!
Newton's three laws govern every sporting movement you can imagine. Newton's First Law (inertia) explains why a Gaelic football stays put until you kick it, and why it keeps flying until air resistance slows it down. Objects resist changes to their motion – the heavier they are, the more they resist.
Newton's Second Law gives us the crucial formula: Force = Mass × Acceleration. This explains why shot putters need massive force to accelerate that heavy ball, or why a lighter hurley can be swung faster than a heavier one. Want more acceleration? Apply more force or reduce the mass.
Newton's Third Law states that every action has an equal and opposite reaction. When you jump, you push down on the ground with a certain force, and the ground pushes back up on you with exactly the same force – that's what launches you into the air.
Remember: These laws work together in every sport – a sprinter uses all three when exploding from the blocks!
Your body is basically a complex system of levers working together. Bones act as lever arms, joints serve as fulcrums, and muscles provide the effort to move loads like your body weight or sports equipment.
There are three classes of levers, and you can remember them with "FRE 123" – First class has the fulcrum in the middle (like nodding your head), second class has the resistance in the middle (like standing on your tiptoes), and third class has the effort in the middle (like doing a bicep curl).
Third-class levers are the most common in your body. They don't give you a mechanical advantage for strength, but they're brilliant for creating speed and range of motion. That's why you can swing a hurley or tennis racket so quickly – your arm acts as a third-class lever system.
Think About It: Every time you throw, kick, or swing something, you're using multiple lever systems working in sequence!
Stability isn't just about standing still – it's about controlling your body's position to perform effectively. Athletes need to be stable when applying force but unstable when they want to move quickly.
Four key factors affect your stability: greater body mass increases stability (harder to move a heavy rugby prop than a lightweight winger), wider base of support makes you more stable (boxers stand with feet apart), lower centre of mass increases stability (wrestlers crouch low), and keeping your line of gravity within your base of support maintains balance.
Smart athletes manipulate these factors constantly. A sprinter in the blocks deliberately becomes unstable by leaning forward, positioning their line of gravity at the edge of their base of support. This makes them ready to explode forward the moment the gun fires.
Pro Tip: Watch how different sports require different stability strategies – compare a gymnast on beam to a rugby player in a scrum!
Let's put theory into practice with a penalty kick in soccer. The player plants their non-kicking foot firmly beside the ball, creating a stable base whilst slightly lowering their centre of mass. They use Newton's Second Law by swinging their leg powerfully to apply massive force to the lightweight ball, creating huge acceleration.
The kicking leg works as a third-class lever – hip joint as fulcrum, leg muscles providing effort, and the ball as resistance. This lever system allows incredible speed at the foot, which transfers to the ball. The run-up builds linear momentum that flows through the kinetic chain.
In contrast, a tackle in Gaelic football focuses on stability and force absorption. The tackler widens their base of support and lowers their centre of mass, creating a rock-solid platform. They use their own momentum to overcome the opponent's momentum, whilst Newton's Third Law explains the equal and opposite forces at impact.
Exam Success: Always link multiple principles together – show how stability enables force application, or how lever systems create the momentum needed for effective performance!
Newton's Laws: Inertia (objects resist change), F = ma (more force equals more acceleration), and action-reaction (forces always come in pairs). These explain every sporting movement from diving to weightlifting.
Lever Classes: First class has fulcrum in middle (neck movements), second class has resistance in middle (calf raises), third class has effort in middle (most body movements). Remember "FRE 123" for the order.
Stability Factors: High mass, wide base of support, low centre of mass, and line of gravity within base of support. Athletes manipulate these constantly – stable when applying force, unstable when initiating movement. Master these principles and you'll understand the "why" behind every technique in sport.
Final Thought: Biomechanics isn't just theory – it's the science that helps athletes break records and avoid injuries. These principles are your toolkit for understanding human movement!
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.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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
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 Knowunity AI. 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 Knowunity AI. 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
Biomechanics might sound complicated, but it's just the physics behind how you move – and it's everywhere in sport. Understanding these principles will help you analyse why certain techniques work better than others and how athletes can improve their performance... Show more
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Biomechanics is essentially physics applied to human movement. It explains why some techniques work brilliantly whilst others fall flat, and it's your key to understanding how athletes can move more efficiently and safely.
The fundamental concepts you need to master include force (any push or pull measured in Newtons), motion (which comes in three types: linear like sprinting, angular like swinging a hurley, and general motion combining both), and velocity (speed with direction). Acceleration tells us how quickly velocity changes, whilst momentum combines mass and velocity to show how much "oomph" a moving object has.
Your centre of mass is your body's theoretical balance point – usually around your navel when standing still. Stability is your ability to resist being moved or to return to your original position. These concepts work together to explain every sporting movement you'll ever see.
Key Point: Don't just memorise definitions – think about how you see these principles in action during your favourite sports!
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Newton's three laws govern every sporting movement you can imagine. Newton's First Law (inertia) explains why a Gaelic football stays put until you kick it, and why it keeps flying until air resistance slows it down. Objects resist changes to their motion – the heavier they are, the more they resist.
Newton's Second Law gives us the crucial formula: Force = Mass × Acceleration. This explains why shot putters need massive force to accelerate that heavy ball, or why a lighter hurley can be swung faster than a heavier one. Want more acceleration? Apply more force or reduce the mass.
Newton's Third Law states that every action has an equal and opposite reaction. When you jump, you push down on the ground with a certain force, and the ground pushes back up on you with exactly the same force – that's what launches you into the air.
Remember: These laws work together in every sport – a sprinter uses all three when exploding from the blocks!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Your body is basically a complex system of levers working together. Bones act as lever arms, joints serve as fulcrums, and muscles provide the effort to move loads like your body weight or sports equipment.
There are three classes of levers, and you can remember them with "FRE 123" – First class has the fulcrum in the middle (like nodding your head), second class has the resistance in the middle (like standing on your tiptoes), and third class has the effort in the middle (like doing a bicep curl).
Third-class levers are the most common in your body. They don't give you a mechanical advantage for strength, but they're brilliant for creating speed and range of motion. That's why you can swing a hurley or tennis racket so quickly – your arm acts as a third-class lever system.
Think About It: Every time you throw, kick, or swing something, you're using multiple lever systems working in sequence!
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Stability isn't just about standing still – it's about controlling your body's position to perform effectively. Athletes need to be stable when applying force but unstable when they want to move quickly.
Four key factors affect your stability: greater body mass increases stability (harder to move a heavy rugby prop than a lightweight winger), wider base of support makes you more stable (boxers stand with feet apart), lower centre of mass increases stability (wrestlers crouch low), and keeping your line of gravity within your base of support maintains balance.
Smart athletes manipulate these factors constantly. A sprinter in the blocks deliberately becomes unstable by leaning forward, positioning their line of gravity at the edge of their base of support. This makes them ready to explode forward the moment the gun fires.
Pro Tip: Watch how different sports require different stability strategies – compare a gymnast on beam to a rugby player in a scrum!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Let's put theory into practice with a penalty kick in soccer. The player plants their non-kicking foot firmly beside the ball, creating a stable base whilst slightly lowering their centre of mass. They use Newton's Second Law by swinging their leg powerfully to apply massive force to the lightweight ball, creating huge acceleration.
The kicking leg works as a third-class lever – hip joint as fulcrum, leg muscles providing effort, and the ball as resistance. This lever system allows incredible speed at the foot, which transfers to the ball. The run-up builds linear momentum that flows through the kinetic chain.
In contrast, a tackle in Gaelic football focuses on stability and force absorption. The tackler widens their base of support and lowers their centre of mass, creating a rock-solid platform. They use their own momentum to overcome the opponent's momentum, whilst Newton's Third Law explains the equal and opposite forces at impact.
Exam Success: Always link multiple principles together – show how stability enables force application, or how lever systems create the momentum needed for effective performance!
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Newton's Laws: Inertia (objects resist change), F = ma (more force equals more acceleration), and action-reaction (forces always come in pairs). These explain every sporting movement from diving to weightlifting.
Lever Classes: First class has fulcrum in middle (neck movements), second class has resistance in middle (calf raises), third class has effort in middle (most body movements). Remember "FRE 123" for the order.
Stability Factors: High mass, wide base of support, low centre of mass, and line of gravity within base of support. Athletes manipulate these constantly – stable when applying force, unstable when initiating movement. Master these principles and you'll understand the "why" behind every technique in sport.
Final Thought: Biomechanics isn't just theory – it's the science that helps athletes break records and avoid injuries. These principles are your toolkit for understanding human movement!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
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.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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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 Knowunity AI. 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 Knowunity AI. 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
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