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Audrey Grace Uffman
12/8/2025
Physics
physics notes for 7-8
103
•
Dec 8, 2025
•
Physics Notes for 7th and 8th Grade
Audrey Grace Uffman
@audreygraceuffman_ugrd
1 / 5
Understanding Speed and Velocity
Speed tells us how fast something is moving. The formula is simple: speed = distance ÷ time. If you travel 50 miles in 2 hours, your speed is 25 mph!
There are two types of speed to know about. Instantaneous speed is how fast you're going at any exact moment (what your speedometer shows), while average speed is calculated over your entire journey.
Graphs can tell us a lot about speed too. When looking at a distance-time graph, the slope of the line gives us the speed or velocity. The steeper the line, the faster the object is moving!
Pro Tip: Velocity is different from speed because it includes direction. If a car is going 30 m/s backward, its velocity would be -30 m/s. The negative sign shows direction!
Chemical Changes and Bonding
Have you ever wondered what happens when you bake cookies? That's a chemical change - a process where substances combine or break apart to form completely new substances with different properties.
In chemical changes, we start with reactants (the original substances) and end up with products (the new substances created). The atoms and molecules rearrange themselves into new combinations during this process.
This is different from a physical change, where something might look different (like water freezing into ice) but is still the same substance chemically.
Fun Fact: Chemical bonds form when atoms share or transfer electrons. This is how completely different substances (like the explosive sodium and toxic chlorine) can combine to make something we use every day (table salt)!
Newton's Three Laws of Motion
Sir Isaac Newton figured out three amazing laws that explain how everything moves! These laws help us understand everything from kicking a soccer ball to launching rockets.
Newton's First Law is about inertia - objects like to stay how they are. If something is sitting still, it will stay still unless a force acts on it. If it's moving, it'll keep moving the same way unless something stops or changes it.
Newton's Second Law gives us the formula F = ma . This means heavier objects need more force to accelerate the same amount as lighter objects.
Newton's Third Law tells us that forces come in pairs - for every action, there's an equal and opposite reaction. When you jump, you push down on the ground, and the ground pushes up on you!
Physics Test Review
Your physics test will cover all the key concepts we've learned about motion, forces, and Newton's laws. The test will include multiple choice questions, true/false statements, and physics problems.
You'll need to know important terms like motion (change in position), reference point (what you compare to determine if something is moving), and force (a push or pull). Also remember friction (the force between surfaces that rub together) and gravity (the force pulling objects toward each other).
For calculations, be prepared to work with speed (distance per unit time), velocity (speed with direction), and acceleration (how quickly velocity changes). The formula F = ma will be essential!
Test Tip: Practice using distance-time graphs! Remember that the slope of the line gives you the speed, and changes in the slope show acceleration.
More Key Physics Concepts
Inertia is an object's resistance to changes in its motion. The more mass something has, the more inertia it has - that's why moving a bowling ball is harder than moving a ping pong ball!
Weight is different from mass - it's actually the measure of gravity's force on an object. Your weight would be different on the moon, but your mass stays the same!
Newton's Laws are essential to understand for your test. Remember: the First Law is about objects staying at rest or in motion unless acted on by forces; the Second Law gives us F = ma; and the Third Law explains that forces always come in equal and opposite pairs.
Remember This: Every time you push something, that object pushes back on you with equal force in the opposite direction. That's why your hand hurts when you punch a wall - the wall "punches" back!
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.
Most popular content: Newton's Second Law
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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
Physics Notes for 7th and 8th Grade
Audrey Grace Uffman
@audreygraceuffman_ugrd
Physics is all about how things move and why they behave the way they do. In these notes, we'll explore speed, velocity, acceleration, chemical changes, and Newton's Laws of Motion - concepts that explain everything from why cars speed up... Show more
Understanding Speed and Velocity
Speed tells us how fast something is moving. The formula is simple: speed = distance ÷ time. If you travel 50 miles in 2 hours, your speed is 25 mph!
There are two types of speed to know about. Instantaneous speed is how fast you're going at any exact moment (what your speedometer shows), while average speed is calculated over your entire journey.
Graphs can tell us a lot about speed too. When looking at a distance-time graph, the slope of the line gives us the speed or velocity. The steeper the line, the faster the object is moving!
Pro Tip: Velocity is different from speed because it includes direction. If a car is going 30 m/s backward, its velocity would be -30 m/s. The negative sign shows direction!
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Improve your grades
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Chemical Changes and Bonding
Have you ever wondered what happens when you bake cookies? That's a chemical change - a process where substances combine or break apart to form completely new substances with different properties.
In chemical changes, we start with reactants (the original substances) and end up with products (the new substances created). The atoms and molecules rearrange themselves into new combinations during this process.
This is different from a physical change, where something might look different (like water freezing into ice) but is still the same substance chemically.
Fun Fact: Chemical bonds form when atoms share or transfer electrons. This is how completely different substances (like the explosive sodium and toxic chlorine) can combine to make something we use every day (table salt)!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Newton's Three Laws of Motion
Sir Isaac Newton figured out three amazing laws that explain how everything moves! These laws help us understand everything from kicking a soccer ball to launching rockets.
Newton's First Law is about inertia - objects like to stay how they are. If something is sitting still, it will stay still unless a force acts on it. If it's moving, it'll keep moving the same way unless something stops or changes it.
Newton's Second Law gives us the formula F = ma . This means heavier objects need more force to accelerate the same amount as lighter objects.
Newton's Third Law tells us that forces come in pairs - for every action, there's an equal and opposite reaction. When you jump, you push down on the ground, and the ground pushes up on you!
Sign up to see the contentIt's free!
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Improve your grades
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Physics Test Review
Your physics test will cover all the key concepts we've learned about motion, forces, and Newton's laws. The test will include multiple choice questions, true/false statements, and physics problems.
You'll need to know important terms like motion (change in position), reference point (what you compare to determine if something is moving), and force (a push or pull). Also remember friction (the force between surfaces that rub together) and gravity (the force pulling objects toward each other).
For calculations, be prepared to work with speed (distance per unit time), velocity (speed with direction), and acceleration (how quickly velocity changes). The formula F = ma will be essential!
Test Tip: Practice using distance-time graphs! Remember that the slope of the line gives you the speed, and changes in the slope show acceleration.
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
More Key Physics Concepts
Inertia is an object's resistance to changes in its motion. The more mass something has, the more inertia it has - that's why moving a bowling ball is harder than moving a ping pong ball!
Weight is different from mass - it's actually the measure of gravity's force on an object. Your weight would be different on the moon, but your mass stays the same!
Newton's Laws are essential to understand for your test. Remember: the First Law is about objects staying at rest or in motion unless acted on by forces; the Second Law gives us F = ma; and the Third Law explains that forces always come in equal and opposite pairs.
Remember This: Every time you push something, that object pushes back on you with equal force in the opposite direction. That's why your hand hurts when you punch a wall - the wall "punches" back!
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.
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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