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PhysicsPhysics128 views·Updated May 17, 2026·11 pages

Edexcel Triple Physics Forces and Motion Revision

F
faraya @faraya_ztdyy

Physics might seem intimidating, but it's actually just the science... Show more

1
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Vectors, Scalars and Basic Motion

Vectors are quantities that need both size and direction to make sense - like when you tell someone to walk 5 metres north. Scalars only need a size - like saying you weigh 60 kg.

Think of it this way: if you're giving directions, you need vectors (displacement, velocity, acceleration). If you're just measuring something, you usually need scalars (distance, speed, mass, energy).

The most basic motion equation you'll use constantly is the speed triangle: Speed = Distance ÷ Time. You can rearrange this to find any missing value. For average speed, just divide the total distance by the total time taken - simple as that!

Quick Tip: Cover up the value you want to find in the triangle, and the remaining two show you the calculation!

2
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Distance-Time Graphs and Acceleration

Distance-time graphs are brilliant because the steepness of the line tells you exactly how fast something is moving. A steep line means high speed, a gentle slope means slow speed, and a flat horizontal line means the object has stopped completely.

Here's the key trick: the gradient (steepness) of the line equals the speed. So if you go up 10 km and across 5 hours, your speed is 10 ÷ 5 = 2 km/h.

Acceleration measures how quickly velocity changes, using the formula: acceleration = finalvelocityinitialvelocityfinal velocity - initial velocity ÷ time. Velocity-time graphs show this perfectly - upward slopes show acceleration, downward slopes show deceleration, and horizontal lines show constant speed.

Remember: Acceleration can be negative, which just means the object is slowing down rather than speeding up!

3
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Newton's Laws of Motion

Newton's first law is basically about laziness - objects don't want to change what they're doing unless something forces them to. A ball won't start rolling until you kick it, and it won't stop rolling unless friction forces it to.

Newton's second law gives us the famous equation F = ma Force=mass×accelerationForce = mass × acceleration. This tells us that heavier objects need more force to accelerate them, and more force always creates more acceleration. One newton is the force needed to accelerate 1 kg by 1 m/s².

Newton's third law is about action and reaction pairs. When you push a trolley forward, the trolley pushes back on you with exactly the same force but in the opposite direction. These reaction forces are always equal, opposite, and act on different objects.

Physics Fact: When you walk, you're actually pushing backwards on the ground, and the ground pushes forwards on you - that's what moves you forward!

4
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Forces and Their Effects

Forces are simply pushes or pulls that can start movement, speed things up, change direction, or stop objects completely. We measure forces in newtons using a newton meter (force meter).

Forces split into two main types: contact forces (like friction and thrust) need objects to touch, while non-contact forces (like magnetism and gravity) work at a distance through invisible fields.

Magnetic forces only affect magnetic materials - opposite poles attract, same poles repel. Electrostatic forces work between charged particles, and gravitational forces pull any objects with mass towards each other. Centripetal force keeps objects moving in circles by constantly changing their direction.

Real-world example: The centripetal force keeping you in your seat on a roundabout is actually the seat pushing inwards on you!

5
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Force Diagrams and Balance

Force diagrams use arrows to show all forces acting on an object. The length of each arrow represents the size of the force, and the direction shows which way it's pushing or pulling.

When forces are balanced (equal in opposite directions), objects either stay still or keep moving at constant velocity. The resultant force is zero. When forces are unbalanced, objects start moving or change their motion - the resultant force is anything except zero.

This explains why you need to keep pedalling a bike on flat ground. Without your pedal force, friction and air resistance would gradually slow you down and stop you.

Key insight: Constant velocity doesn't mean no forces are acting - it means all forces are perfectly balanced!

6
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Mass, Weight and Stopping Distance

Don't confuse mass and weight - mass is the amount of matter in an object (measured in kg), while weight is the gravitational force acting on that mass (measured in newtons). Your mass stays the same everywhere, but your weight changes depending on gravity strength.

Use the equation Weight = mass × gravity W=mgW = mg. On Earth, gravity is approximately 9.8 N/kg.

Stopping distance = thinking distance + braking distance. Thinking distance is how far you travel while recognising a hazard and reacting. Braking distance is how far you travel while the brakes actually stop you. Speed affects both, but distractions, tiredness, and road conditions also play major roles.

Safety tip: Doubling your speed roughly quadruples your stopping distance - that's why speed limits exist!

7
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve
8
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve
9
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve
10
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

We thought you’d never ask...

What is the Knowunity AI companion?

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.

Where can I download the Knowunity app?

You can download the app from Google Play Store and 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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PhysicsPhysics128 views·Updated May 17, 2026·11 pages

Edexcel Triple Physics Forces and Motion Revision

F
faraya @faraya_ztdyy

Physics might seem intimidating, but it's actually just the science that explains how everything around you moves and behaves. From why your phone drops when you let go of it to how cars brake safely, physics gives us the tools... Show more

1
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Vectors, Scalars and Basic Motion

Vectors are quantities that need both size and direction to make sense - like when you tell someone to walk 5 metres north. Scalars only need a size - like saying you weigh 60 kg.

Think of it this way: if you're giving directions, you need vectors (displacement, velocity, acceleration). If you're just measuring something, you usually need scalars (distance, speed, mass, energy).

The most basic motion equation you'll use constantly is the speed triangle: Speed = Distance ÷ Time. You can rearrange this to find any missing value. For average speed, just divide the total distance by the total time taken - simple as that!

Quick Tip: Cover up the value you want to find in the triangle, and the remaining two show you the calculation!

2
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Distance-Time Graphs and Acceleration

Distance-time graphs are brilliant because the steepness of the line tells you exactly how fast something is moving. A steep line means high speed, a gentle slope means slow speed, and a flat horizontal line means the object has stopped completely.

Here's the key trick: the gradient (steepness) of the line equals the speed. So if you go up 10 km and across 5 hours, your speed is 10 ÷ 5 = 2 km/h.

Acceleration measures how quickly velocity changes, using the formula: acceleration = finalvelocityinitialvelocityfinal velocity - initial velocity ÷ time. Velocity-time graphs show this perfectly - upward slopes show acceleration, downward slopes show deceleration, and horizontal lines show constant speed.

Remember: Acceleration can be negative, which just means the object is slowing down rather than speeding up!

3
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Newton's Laws of Motion

Newton's first law is basically about laziness - objects don't want to change what they're doing unless something forces them to. A ball won't start rolling until you kick it, and it won't stop rolling unless friction forces it to.

Newton's second law gives us the famous equation F = ma Force=mass×accelerationForce = mass × acceleration. This tells us that heavier objects need more force to accelerate them, and more force always creates more acceleration. One newton is the force needed to accelerate 1 kg by 1 m/s².

Newton's third law is about action and reaction pairs. When you push a trolley forward, the trolley pushes back on you with exactly the same force but in the opposite direction. These reaction forces are always equal, opposite, and act on different objects.

Physics Fact: When you walk, you're actually pushing backwards on the ground, and the ground pushes forwards on you - that's what moves you forward!

4
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Forces and Their Effects

Forces are simply pushes or pulls that can start movement, speed things up, change direction, or stop objects completely. We measure forces in newtons using a newton meter (force meter).

Forces split into two main types: contact forces (like friction and thrust) need objects to touch, while non-contact forces (like magnetism and gravity) work at a distance through invisible fields.

Magnetic forces only affect magnetic materials - opposite poles attract, same poles repel. Electrostatic forces work between charged particles, and gravitational forces pull any objects with mass towards each other. Centripetal force keeps objects moving in circles by constantly changing their direction.

Real-world example: The centripetal force keeping you in your seat on a roundabout is actually the seat pushing inwards on you!

5
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Force Diagrams and Balance

Force diagrams use arrows to show all forces acting on an object. The length of each arrow represents the size of the force, and the direction shows which way it's pushing or pulling.

When forces are balanced (equal in opposite directions), objects either stay still or keep moving at constant velocity. The resultant force is zero. When forces are unbalanced, objects start moving or change their motion - the resultant force is anything except zero.

This explains why you need to keep pedalling a bike on flat ground. Without your pedal force, friction and air resistance would gradually slow you down and stop you.

Key insight: Constant velocity doesn't mean no forces are acting - it means all forces are perfectly balanced!

6
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

Mass, Weight and Stopping Distance

Don't confuse mass and weight - mass is the amount of matter in an object (measured in kg), while weight is the gravitational force acting on that mass (measured in newtons). Your mass stays the same everywhere, but your weight changes depending on gravity strength.

Use the equation Weight = mass × gravity W=mgW = mg. On Earth, gravity is approximately 9.8 N/kg.

Stopping distance = thinking distance + braking distance. Thinking distance is how far you travel while recognising a hazard and reacting. Braking distance is how far you travel while the brakes actually stop you. Speed affects both, but distractions, tiredness, and road conditions also play major roles.

Safety tip: Doubling your speed roughly quadruples your stopping distance - that's why speed limits exist!

7
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
8
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
9
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students
10
of 10
Phy
SiCS

PL

Vectors and scalars.

Vector: a quantity with magnitude and direction.
Scalari a quantity with only magnitude.

Examples:
| Ve

Sign up to see the content. It's free!

  • Access to all documents
  • Improve your grades
  • Join milions of students

We thought you’d never ask...

What is the Knowunity AI companion?

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.

Where can I download the Knowunity app?

You can download the app from Google Play Store and 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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Criminology unit 4 detailed revision note

126,887123
CriminologyCriminology

Criminology 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.

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English LiteratureEnglish Literature

Romeo and Juliet: Key themes

Key Romeo and Juliet themes and analysed quotes

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English LiteratureEnglish Literature

Macbeth: Guilt and Ambition

Explore the complex themes of guilt and ambition in Shakespeare's 'Macbeth'. This analysis covers key characters, including Macbeth and Lady Macbeth, their moral dilemmas, and the tragic consequences of their ambition. Ideal for students studying character motivations, thematic elements, and the psychological impact of power. Includes insights on the natural order, manipulation, and the descent into madness.

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C
BiologyBiology

Cell Biology and Cell structure

cell structures

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