•

Dec 12, 2025

•

1 page

Understanding Newton's Laws of Motion

Matilda Fenn

@matildafenn_ikwp

Newton's laws are the foundation of how everything moves in... Show more

# NEWTONS LAW

23ra March 2023.

Newton's first law:

An object will move / continue at constant speed (or rest)
unless afected on by an ext

Newton's Three Laws of Motion

Ever wonder why you lurch forward when a bus suddenly stops? Newton's first law explains this perfectly - objects want to keep doing what they're already doing unless something forces them to change. If you're moving at constant speed (or sitting still), you'll carry on like that until an external force steps in.

When forces are balanced, nothing dramatic happens - objects either stay put or cruise along at the same speed. But when forces become unbalanced, that's when the action starts! Objects will accelerate or slow down in the direction of the stronger force.

Newton's second law is brilliant in its simplicity: push something harder, and it accelerates more. The bigger the force you apply, the greater the acceleration you'll get. This is why you can't push a car as easily as you can push a shopping trolley.

Key insight: The direction of acceleration always matches the direction of the unbalanced force - this is crucial for solving physics problems!

Here's where it gets interesting - Newton's third law states that every action creates an equal and opposite reaction. When you walk, you push back on the ground, and the ground pushes forward on you with exactly the same force. These action-reaction pairs always have the same strength but work in opposite directions on different objects.

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 in Physics

GCSE Physics: Energy & Radioactivity

Explore key concepts in GCSE Physics, including energy types, power calculations, radioactive decay (alpha, beta, gamma), and electrical circuits. This summary covers essential topics such as conservation of energy, resistance, and the National Grid, providing a comprehensive overview for exam preparation.

Physics

AQA Physics Paper 1 Overview

Comprehensive summary of key concepts in AQA Physics Paper 1, covering atomic structure, energy transfers, radioactivity, electrical circuits, and more. Ideal for exam preparation and revision. Topics include nuclear fission, half-life, specific latent heat, and the particle model.

Physics

BTEC Applied Science Unit 1 Overview

Comprehensive resource for Year 12 students pursuing a Level 3 Diploma in Applied Science. This booklet covers essential topics including cell structure, chemical properties, and wave theory, providing clear explanations and key concepts to aid in your studies and exam preparation.

Chemistry

Forces and Motion Overview

Explore key concepts in Forces and Motion, including Hooke's Law, velocity, acceleration, and the principles of moments. This summary covers essential topics such as the relationship between force and extension, terminal velocity, and the impact of safety devices in physics. Ideal for AQA Physics Unit 5 revision.

Physics

Energy Transfers in Physics

Explore the principles of energy transfer, including gravitational potential energy, kinetic energy, and elastic potential energy. This summary covers key concepts such as work done, efficiency, and the impact of friction on energy dissipation. Ideal for GCSE AQA Physics students seeking to understand energy transformations and conservation.

Physics

Understanding Radioactivity

Explore the key concepts of radioactivity, including nuclear fission, decay types (alpha, beta, gamma), and detection methods like Geiger-Müller counters. This comprehensive summary covers essential topics for GCSE Physics, including isotopes, half-life, and practical applications in medicine and safety.

Physics

Electricity Fundamentals

Comprehensive GCSE AQA Physics notes covering key concepts of electricity, including series and parallel circuits, power calculations, resistance, electrostatics, and the National Grid. Ideal for students preparing for exams, this resource provides clear explanations and essential formulas.

Physics

Evolution of Atomic Models

Explore the key developments in atomic theory from Democritus to Maria Goeppert-Mayer. This timeline highlights significant contributions to our understanding of atomic structure, including the discovery of protons, neutrons, and electrons, and the evolution of atomic models. Ideal for students studying atomic theory and its historical context.

Chemistry

Electricity Fundamentals

Explore the essential concepts of electricity, including the national grid, potential difference, current flow, and circuit types. This summary covers key principles such as Ohm's law, series and parallel circuits, and practical applications of electrical components. Ideal for students preparing for exams or seeking a comprehensive understanding of electrical systems.

Physics

Most popular content

Comprehensive Crime & Deviance Overview

Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.

Sociology

An Inspector Calls: Character Insights

Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.

English Literature

Sociology of Education Overview

Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.

Sociology

aqa higher tier combined science - biology b1 : cell biology, paper 1

b1: cell biology - paper 1

Biology

Sociology of Families: Comprehensive Revision

Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.

Sociology

English - inspector calls quotes and analysis

Quotes from every main character

English Literature

Criminal Justice Evidence Rules

Explore the essential rules governing the use of evidence in criminal cases, including reliability, admissibility, and relevance. This summary covers key concepts such as the roles of personnel in investigations, the impact of witness testimonies, and the implications of plea bargaining. Ideal for Year 13 criminology students preparing for assessments.

Criminology

Biology Paper 1 Overview

Comprehensive study notes covering key concepts in cellular biology, human digestion, respiration, photosynthesis, and the circulatory system. This resource includes detailed explanations of cell structures, enzyme functions, nutrient absorption, and the impact of environmental factors on biological processes. Ideal for students preparing for Biology Paper 1 exams.

Biology

Power & Conflict Poetry Analysis

Explore in-depth analyses of key poems for GCSE English Literature, including Ozymandias, Storm on the Island, London, My Last Duchess, and more. This resource covers themes, structure, and key quotes to enhance your understanding of war and conflict in poetry. Ideal for exam preparation and comparative studies.

English Literature

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

Stefan S

iOS user

Samantha Klich

Android user

Anna

iOS user

Thomas R

iOS user

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

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

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

Elisha

iOS user

Paul T

iOS user

Physics

•

835

•

Dec 12, 2025

•

1 page

Understanding Newton's Laws of Motion

Matilda Fenn

@matildafenn_ikwp

Newton's laws are the foundation of how everything moves in our universe, from footballs to rockets. These three simple rules explain why objects stay still, speed up, or change direction - and once you get them, physics suddenly makes much... Show more

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

Newton's Three Laws of Motion

Key insight: The direction of acceleration always matches the direction of the unbalanced force - this is crucial for solving physics problems!