Physics gets much easier once you understand the difference between...
Physics179 views·Updated 3 Jul 2026·4 pagesGCSE Physics Revision Guide: Key Physics Topics
Isha Patel@ishx_0119
1 / 4
1
of 4
Scalars, Vectors and Force Basics
Think of scalars as simple measurements with just size - like your mass (70kg) or temperature (20°C). Vectors are more complex because they need both size and direction, like velocity (30 m/s north) or force.
Here's the key difference: speed is scalar (just "how fast"), but velocity is vector ("how fast and in which direction"). Same goes for distance (scalar) versus displacement (vector with direction).
Forces are basically pushes or pulls that can change an object's shape, speed, or direction. You've got contact forces (like friction when you slide down a slope) and non-contact forces (like gravity pulling you down even when you're jumping).
Quick Tip: Remember that force is measured in newtons (N), where 1kN = 1,000N and 1MN = 1,000,000N.
2
of 4
Weight, Resultant Forces and Work Done
Your weight isn't the same as your mass - weight is gravity pulling on your mass. The formula is simple: weight = mass × gravitational field strength. Your mass stays the same on Mars, but your weight changes because gravity is different there.
When multiple forces act on an object, you can replace them with one resultant force that has the same effect. Free body diagrams help you visualise all the forces, whilst resolving forces involves breaking them into horizontal and vertical components using triangles or parallelograms.
Work done happens when a force moves something: W = F × s (work = force × distance). One joule equals one newton moving something one metre. Crucially, if nothing moves, no work is done - even if you're pushing really hard against a wall!
Remember: Work and energy have the same units (joules) because when work is done, energy gets transferred.
3
of 4
Forces and Elasticity
You need at least two forces to change an object's shape - one force can only change speed or direction. Think about stretching a spring: you pull one end whilst something holds the other end.
Elastic deformation means the object returns to its original shape (like a proper spring). Inelastic deformation means it stays permanently stretched or bent. Hooke's Law gives us F = k × e, where k is the spring constant (how stiff the spring is) and e is the extension.
The elastic potential energy stored in a stretched spring is Ee = ½ke². This energy is only stored during elastic deformation - if you stretch something too far past its limit of proportionality, it won't store energy properly anymore.
Key Point: A large spring constant means the spring is really stiff and hard to stretch - think car suspension versus a slinky toy.
4
of 4
Moments, Levers and Gears
The moment is the turning effect of a force around a pivot point. You can get a bigger turning effect by applying more force or by positioning that force further from the pivot: M = F × d.
The principle of moments is brilliant for understanding balance: when something is in equilibrium, clockwise moments equal anticlockwise moments. This is why you can lift someone heavier than you on a seesaw by sitting further from the middle.
Stability depends on having a wide base and keeping the centre of mass low. Gears work by transferring turning effects - a larger output gear gives more turning force than the input gear, but the force between the gear teeth is always equal and opposite.
Real-world Application: Spanners, scissors, bottle openers and bike gears all use these moment principles to make tasks easier.
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: Force
7PhysicsEnergy & Electricity Overview
Explore a comprehensive mindmap detailing key concepts in Energy and Electricity, including energy resources, domestic electricity, and the relationship between energy and matter. Ideal for students preparing for Physics Paper 2.
95587
PhysicsUnderstanding Forces: Contact vs Non-Contact
Explore the fundamental concepts of contact and non-contact forces in physics. This summary covers key definitions, examples, and Newton's Third Law of Motion, making it essential for GCSE Physics students. Learn about friction, tension, magnetic, and gravitational forces, and how they interact in various scenarios.
91511
PhysicsForces in Physics: Key Concepts
Explore essential concepts in Physics related to forces, including static equilibrium, kinetic energy, momentum, and Newton's Laws of Motion. This comprehensive booklet features past paper questions and mark schemes to help identify and strengthen your understanding of key topics. Ideal for students preparing for exams in AQA Physics.
91,51538
PhysicsPhysics forces revesion
Aqa gcse
11834
PhysicsForces
forces (year 9) physics
91624
PhysicsForces
Forces from aqa tripple science physics
111054
PhysicsUnderstanding Forces
Explore the fundamental concepts of forces in physics, including contact and non-contact forces, their types such as tension, friction, and gravitational force, and how they are measured. This summary provides clear definitions and examples, making it ideal for students studying the basics of forces. Key topics include scalars vs. vectors and the use of force meters.
7490
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3752
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.
109,195872
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96391
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.
1116,074940
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!
104531
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.
1011,409477
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
101,24211
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
101,33138
I
PhysicsIdentifying Types of Energy Stores
Learn to recognize different energy stores including kinetic, gravitational potential, chemical, and thermal in various objects and systems.
S32380
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.
12102,9093,041
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.
1273,6962,307
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.
1254,8811,059
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.
1251,6621,399
C
BiologyCell Biology and Cell structure
cell structures
93,2590
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,161125
English LiteratureAn 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.
1025,437907
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,766210
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.
1231,468846
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
Physics179 views·Updated 3 Jul 2026·4 pagesGCSE Physics Revision Guide: Key Physics Topics
Isha Patel@ishx_0119
Physics gets much easier once you understand the difference between scalars and vectors, and how forces work in the real world. This guide covers everything from basic measurements to complex force calculations, plus some brilliant applications like levers and springs...
1
of 4
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
Scalars, Vectors and Force Basics
Think of scalars as simple measurements with just size - like your mass (70kg) or temperature (20°C). Vectors are more complex because they need both size and direction, like velocity (30 m/s north) or force.
Here's the key difference: speed is scalar (just "how fast"), but velocity is vector ("how fast and in which direction"). Same goes for distance (scalar) versus displacement (vector with direction).
Forces are basically pushes or pulls that can change an object's shape, speed, or direction. You've got contact forces (like friction when you slide down a slope) and non-contact forces (like gravity pulling you down even when you're jumping).
Quick Tip: Remember that force is measured in newtons (N), where 1kN = 1,000N and 1MN = 1,000,000N.
2
of 4Sign 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
Weight, Resultant Forces and Work Done
Your weight isn't the same as your mass - weight is gravity pulling on your mass. The formula is simple: weight = mass × gravitational field strength. Your mass stays the same on Mars, but your weight changes because gravity is different there.
When multiple forces act on an object, you can replace them with one resultant force that has the same effect. Free body diagrams help you visualise all the forces, whilst resolving forces involves breaking them into horizontal and vertical components using triangles or parallelograms.
Work done happens when a force moves something: W = F × s (work = force × distance). One joule equals one newton moving something one metre. Crucially, if nothing moves, no work is done - even if you're pushing really hard against a wall!
Remember: Work and energy have the same units (joules) because when work is done, energy gets transferred.
3
of 4Sign 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 Elasticity
You need at least two forces to change an object's shape - one force can only change speed or direction. Think about stretching a spring: you pull one end whilst something holds the other end.
Elastic deformation means the object returns to its original shape (like a proper spring). Inelastic deformation means it stays permanently stretched or bent. Hooke's Law gives us F = k × e, where k is the spring constant (how stiff the spring is) and e is the extension.
The elastic potential energy stored in a stretched spring is Ee = ½ke². This energy is only stored during elastic deformation - if you stretch something too far past its limit of proportionality, it won't store energy properly anymore.
Key Point: A large spring constant means the spring is really stiff and hard to stretch - think car suspension versus a slinky toy.
4
of 4Sign 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
Moments, Levers and Gears
The moment is the turning effect of a force around a pivot point. You can get a bigger turning effect by applying more force or by positioning that force further from the pivot: M = F × d.
The principle of moments is brilliant for understanding balance: when something is in equilibrium, clockwise moments equal anticlockwise moments. This is why you can lift someone heavier than you on a seesaw by sitting further from the middle.
Stability depends on having a wide base and keeping the centre of mass low. Gears work by transferring turning effects - a larger output gear gives more turning force than the input gear, but the force between the gear teeth is always equal and opposite.
Real-world Application: Spanners, scissors, bottle openers and bike gears all use these moment principles to make tasks easier.
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: Force
7PhysicsEnergy & Electricity Overview
Explore a comprehensive mindmap detailing key concepts in Energy and Electricity, including energy resources, domestic electricity, and the relationship between energy and matter. Ideal for students preparing for Physics Paper 2.
95587
PhysicsUnderstanding Forces: Contact vs Non-Contact
Explore the fundamental concepts of contact and non-contact forces in physics. This summary covers key definitions, examples, and Newton's Third Law of Motion, making it essential for GCSE Physics students. Learn about friction, tension, magnetic, and gravitational forces, and how they interact in various scenarios.
91511
PhysicsForces in Physics: Key Concepts
Explore essential concepts in Physics related to forces, including static equilibrium, kinetic energy, momentum, and Newton's Laws of Motion. This comprehensive booklet features past paper questions and mark schemes to help identify and strengthen your understanding of key topics. Ideal for students preparing for exams in AQA Physics.
91,51538
PhysicsPhysics forces revesion
Aqa gcse
11834
PhysicsForces
forces (year 9) physics
91624
PhysicsForces
Forces from aqa tripple science physics
111054
PhysicsUnderstanding Forces
Explore the fundamental concepts of forces in physics, including contact and non-contact forces, their types such as tension, friction, and gravitational force, and how they are measured. This summary provides clear definitions and examples, making it ideal for students studying the basics of forces. Key topics include scalars vs. vectors and the use of force meters.
7490
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3752
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.
109,195872
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96391
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.
1116,074940
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!
104531
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.
1011,409477
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
101,24211
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
101,33138
I
PhysicsIdentifying Types of Energy Stores
Learn to recognize different energy stores including kinetic, gravitational potential, chemical, and thermal in various objects and systems.
S32380
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.
12102,9093,041
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.
1273,6962,307
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.
1254,8811,059
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.
1251,6621,399
C
BiologyCell Biology and Cell structure
cell structures
93,2590
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,161125
English LiteratureAn 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.
1025,437907
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,766210
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.
1231,468846
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