Forces are everywhere around you - from walking down the...
Physics103 views·Updated 15 Jul 2026·5 pagesGCSE Physics Edexcel Topic 2: Motion Notes (Combined and Triple)
Siddharth Sriram@sidlovestransprt
1 / 5
1
of 5
Forces and Newton's First Law
Every time you push, pull, or bump into something, you're applying a force, measured in Newtons (N). When multiple forces act on an object, they combine to create a resultant force - think of it as the 'winning' force after all forces battle it out.
Here's the key bit: if forces are balanced (resultant force = 0), nothing changes. If they're unbalanced, things start moving or change speed. A book sitting on your desk has balanced forces - gravity pulls down whilst the desk pushes up with equal force.
Newton's First Law tells us that objects are lazy - they don't want to change what they're doing. This laziness is called inertia, and it's why you lurch forward when a bus suddenly stops.
Quick Check: A football rolling on grass gradually slows down because friction (an external force) acts against its motion, proving Newton's First Law!
2
of 5
Mass, Weight, and Newton's Second Law
Don't confuse mass and weight - your mass (measured in kg) stays the same whether you're on Earth or the Moon, but your weight (measured in N) changes because weight is what happens when gravity acts on your mass.
Newton's Second Law gives us the famous equation: F = ma (Force = mass × acceleration). This means heavier objects need more force to speed up, and lighter objects accelerate more easily with the same force.
The mathematical relationship shows that force is proportional to the rate of change in momentum. Essentially, if you want to change how fast something's moving, you need to apply force - and the bigger the change you want, the more force you'll need.
Real-world example: It takes much more force to accelerate a lorry than a bicycle because the lorry has significantly more mass!
3
of 5
Newton's Third Law
Newton's Third Law is probably the most misunderstood: "For every action, there is an equal and opposite reaction." This doesn't mean forces cancel out - they act on different objects entirely.
When you sit on a chair, you push down with 200N whilst the chair pushes up on you with 200N. These forces are equal in size but opposite in direction. You don't fly off because the forces balance, but if you applied more force than the chair could handle, it would break.
This law explains how rockets work in space (they push gas backwards, so the gas pushes the rocket forwards) and why you can walk (you push backwards on the ground, so the ground pushes you forwards).
Think about it: When you jump, you push down on the Earth and it pushes back up on you - but you move more because you have much less mass than the planet!
4
of 5
Momentum and Stopping Distances
Momentum (p = mass × velocity) measures how hard it is to stop a moving object. A massive lorry moving slowly can have the same momentum as a small car moving quickly, making both equally difficult to stop.
The conservation of momentum means the total momentum before a collision equals the total momentum after. When two cars crash and stick together, they share their momentum between them.
Stopping distance for cars has two parts: thinking distance (how far you travel whilst reacting) and braking distance (how far you travel whilst the brakes work). Human reaction time is typically 0.25 seconds, but distractions like phones or alcohol make this much worse.
Safety tip: Doubling your speed roughly quadruples your stopping distance - that's why speed limits exist!
5
of 5
Crash Safety and Deceleration
When cars crash, deceleration (negative acceleration) creates enormous forces that can be deadly. Modern cars use crumple zones - areas designed to crumple and absorb impact energy, increasing the time it takes to stop.
The force during a collision depends on the change in momentum and the time taken. The formula F = (mv - mu)/t shows that increasing the stopping time dramatically reduces the force experienced by passengers.
A worked example: A 1500kg car travelling at 15 m/s hits a wall and stops in 0.07 seconds. The force calculation gives -321,429N - that's equivalent to about 32 tonnes pushing backwards! The negative sign shows the force opposes the original motion.
Engineering insight: Crumple zones, airbags, and seatbelts all work by increasing stopping time, which reduces the forces acting on your body during a crash.
We thought you’d never ask...
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Newton's Second Law
9PhysicsPhysics Paper 1 Overview
Explore key concepts in Physics Paper 1, including Newton's Laws of Motion, energy types, radioactivity, and wave phenomena. This summary covers essential topics such as gravitational potential energy, work done, and the electromagnetic spectrum, providing a comprehensive review for exam preparation.
1182014
PhysicsUnderstanding Forces in Physics
Explore the key concepts of forces in physics, including scalar and vector quantities, Newton's Laws of Motion, and resultant forces. This summary provides essential insights for AQA exam preparation, focusing on the distinctions between contact and non-contact forces, momentum, and gravitational effects. Ideal for students seeking a concise overview of the topic.
1149312
PhysicsNewton's Second Law Explained
Explore Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This summary covers key concepts such as force, mass, and acceleration, providing clear examples and applications relevant for GCSE AQA Combined Science students.
112553
PhysicsPhysics Paper 2 Overview
Comprehensive summary of key concepts in Physics Paper 2, covering topics such as motion, waves, electromagnetism, and the life cycle of stars. Ideal for AQA exam preparation, this resource includes essential principles like Newton's Laws, refraction, and the electromagnetic spectrum. Enhance your understanding of physics with clear explanations and practical applications.
1111,437865
PhysicsForces & Motion Essentials
Explore key concepts in forces and motion, including distance-time graphs, velocity-time graphs, Newton's laws, momentum, and the effects of forces on motion. This summary provides essential formulas and examples to aid understanding and exam preparation.
101331
PhysicsNewton's Laws & Momentum
Explore the fundamentals of Newton's Laws of Motion and the concept of momentum in this concise summary. Understand the first, second, and third laws, along with the formula for calculating momentum. Ideal for GCSE Physics students preparing for exams.
1157413
PhysicsForces and Motion Essentials
Explore key concepts in forces and motion with this active recall resource. Covering topics such as Newton's Laws, vector and scalar quantities, acceleration, momentum, and the effects of forces on motion, this study material is designed to enhance your understanding and retention for GCSE Physics. Ideal for exam preparation and quick revision.
111,84241
PhysicsGCSE Physics Calculations
Enhance your understanding of key physics concepts with this comprehensive practice resource. Covering topics such as electromagnetism, mechanics, wave properties, and energy calculations, this study material includes worked examples and practice problems to prepare for Paper 2. Ideal for GCSE students looking to solidify their knowledge in physics calculations.
111,51141
PhysicsGCSE PHYSICS Combined Higher paper 1 notes
Core information for paper 1 of physics. Edexcel
111571
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
111,3802
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96411
PhysicsForces 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.
109,214872
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104571
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
111,24611
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,077941
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1111,416477
I
PhysicsIdentifying Types of Energy Stores
Learn to recognize different energy stores including kinetic, gravitational potential, chemical, and thermal in various objects and systems.
102380
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
111,33138
Most popular content
9
SociologySociology 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.
12102,9683,040
SociologySociology 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.
1273,7782,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8971,060
SociologyComprehensive 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.
1251,6701,400
C
BiologyCell Biology and Cell structure
cell structures
113,2880
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
112,8215
SociologySociological Theories Overview
Comprehensive revision of key sociological theories including Functionalism, Marxism, Feminism, and Interpretivism. Explore concepts like value freedom, identity formation, and the critique of social control. Ideal for AQA A-Level Sociology students preparing for exams. This summary covers essential theories and their implications in sociology, providing a clear understanding of each perspective.
1231,483846
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,177125
1
Biology1.cells Gcse biology question cards
combined science higher biology
112,3694
Students love us — and so will you.
4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.
AnnaiOS user
Physics103 views·Updated 15 Jul 2026·5 pagesGCSE Physics Edexcel Topic 2: Motion Notes (Combined and Triple)
Siddharth Sriram@sidlovestransprt
Forces are everywhere around you - from walking down the street to cars braking suddenly. Understanding how forces work helps explain why objects move, stop, or stay still, and it's crucial for understanding everything from car safety to space travel.
1
of 5
Sign up to see the content. It'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 Newton's First Law
Every time you push, pull, or bump into something, you're applying a force, measured in Newtons (N). When multiple forces act on an object, they combine to create a resultant force - think of it as the 'winning' force after all forces battle it out.
Here's the key bit: if forces are balanced (resultant force = 0), nothing changes. If they're unbalanced, things start moving or change speed. A book sitting on your desk has balanced forces - gravity pulls down whilst the desk pushes up with equal force.
Newton's First Law tells us that objects are lazy - they don't want to change what they're doing. This laziness is called inertia, and it's why you lurch forward when a bus suddenly stops.
Quick Check: A football rolling on grass gradually slows down because friction (an external force) acts against its motion, proving Newton's First Law!
2
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Mass, Weight, and Newton's Second Law
Don't confuse mass and weight - your mass (measured in kg) stays the same whether you're on Earth or the Moon, but your weight (measured in N) changes because weight is what happens when gravity acts on your mass.
Newton's Second Law gives us the famous equation: F = ma (Force = mass × acceleration). This means heavier objects need more force to speed up, and lighter objects accelerate more easily with the same force.
The mathematical relationship shows that force is proportional to the rate of change in momentum. Essentially, if you want to change how fast something's moving, you need to apply force - and the bigger the change you want, the more force you'll need.
Real-world example: It takes much more force to accelerate a lorry than a bicycle because the lorry has significantly more mass!
3
of 5Sign up to see the content. It'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 Third Law
Newton's Third Law is probably the most misunderstood: "For every action, there is an equal and opposite reaction." This doesn't mean forces cancel out - they act on different objects entirely.
When you sit on a chair, you push down with 200N whilst the chair pushes up on you with 200N. These forces are equal in size but opposite in direction. You don't fly off because the forces balance, but if you applied more force than the chair could handle, it would break.
This law explains how rockets work in space (they push gas backwards, so the gas pushes the rocket forwards) and why you can walk (you push backwards on the ground, so the ground pushes you forwards).
Think about it: When you jump, you push down on the Earth and it pushes back up on you - but you move more because you have much less mass than the planet!
4
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Momentum and Stopping Distances
Momentum (p = mass × velocity) measures how hard it is to stop a moving object. A massive lorry moving slowly can have the same momentum as a small car moving quickly, making both equally difficult to stop.
The conservation of momentum means the total momentum before a collision equals the total momentum after. When two cars crash and stick together, they share their momentum between them.
Stopping distance for cars has two parts: thinking distance (how far you travel whilst reacting) and braking distance (how far you travel whilst the brakes work). Human reaction time is typically 0.25 seconds, but distractions like phones or alcohol make this much worse.
Safety tip: Doubling your speed roughly quadruples your stopping distance - that's why speed limits exist!
5
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Crash Safety and Deceleration
When cars crash, deceleration (negative acceleration) creates enormous forces that can be deadly. Modern cars use crumple zones - areas designed to crumple and absorb impact energy, increasing the time it takes to stop.
The force during a collision depends on the change in momentum and the time taken. The formula F = (mv - mu)/t shows that increasing the stopping time dramatically reduces the force experienced by passengers.
A worked example: A 1500kg car travelling at 15 m/s hits a wall and stops in 0.07 seconds. The force calculation gives -321,429N - that's equivalent to about 32 tonnes pushing backwards! The negative sign shows the force opposes the original motion.
Engineering insight: Crumple zones, airbags, and seatbelts all work by increasing stopping time, which reduces the forces acting on your body during a crash.
We thought you’d never ask...
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Newton's Second Law
9PhysicsPhysics Paper 1 Overview
Explore key concepts in Physics Paper 1, including Newton's Laws of Motion, energy types, radioactivity, and wave phenomena. This summary covers essential topics such as gravitational potential energy, work done, and the electromagnetic spectrum, providing a comprehensive review for exam preparation.
1182014
PhysicsUnderstanding Forces in Physics
Explore the key concepts of forces in physics, including scalar and vector quantities, Newton's Laws of Motion, and resultant forces. This summary provides essential insights for AQA exam preparation, focusing on the distinctions between contact and non-contact forces, momentum, and gravitational effects. Ideal for students seeking a concise overview of the topic.
1149312
PhysicsNewton's Second Law Explained
Explore Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This summary covers key concepts such as force, mass, and acceleration, providing clear examples and applications relevant for GCSE AQA Combined Science students.
112553
PhysicsPhysics Paper 2 Overview
Comprehensive summary of key concepts in Physics Paper 2, covering topics such as motion, waves, electromagnetism, and the life cycle of stars. Ideal for AQA exam preparation, this resource includes essential principles like Newton's Laws, refraction, and the electromagnetic spectrum. Enhance your understanding of physics with clear explanations and practical applications.
1111,437865
PhysicsForces & Motion Essentials
Explore key concepts in forces and motion, including distance-time graphs, velocity-time graphs, Newton's laws, momentum, and the effects of forces on motion. This summary provides essential formulas and examples to aid understanding and exam preparation.
101331
PhysicsNewton's Laws & Momentum
Explore the fundamentals of Newton's Laws of Motion and the concept of momentum in this concise summary. Understand the first, second, and third laws, along with the formula for calculating momentum. Ideal for GCSE Physics students preparing for exams.
1157413
PhysicsForces and Motion Essentials
Explore key concepts in forces and motion with this active recall resource. Covering topics such as Newton's Laws, vector and scalar quantities, acceleration, momentum, and the effects of forces on motion, this study material is designed to enhance your understanding and retention for GCSE Physics. Ideal for exam preparation and quick revision.
111,84241
PhysicsGCSE Physics Calculations
Enhance your understanding of key physics concepts with this comprehensive practice resource. Covering topics such as electromagnetism, mechanics, wave properties, and energy calculations, this study material includes worked examples and practice problems to prepare for Paper 2. Ideal for GCSE students looking to solidify their knowledge in physics calculations.
111,51141
PhysicsGCSE PHYSICS Combined Higher paper 1 notes
Core information for paper 1 of physics. Edexcel
111571
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
111,3802
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96411
PhysicsForces 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.
109,214872
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104571
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
111,24611
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,077941
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1111,416477
I
PhysicsIdentifying Types of Energy Stores
Learn to recognize different energy stores including kinetic, gravitational potential, chemical, and thermal in various objects and systems.
102380
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
111,33138
Most popular content
9SociologySociology 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.
12102,9683,040
SociologySociology 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.
1273,7782,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8971,060
SociologyComprehensive 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.
1251,6701,400
C
BiologyCell Biology and Cell structure
cell structures
113,2880
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
112,8215
SociologySociological Theories Overview
Comprehensive revision of key sociological theories including Functionalism, Marxism, Feminism, and Interpretivism. Explore concepts like value freedom, identity formation, and the critique of social control. Ideal for AQA A-Level Sociology students preparing for exams. This summary covers essential theories and their implications in sociology, providing a clear understanding of each perspective.
1231,483846
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,177125
1
Biology1.cells Gcse biology question cards
combined science higher biology
112,3694
Students love us — and so will you.
4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.
AnnaiOS user