Understanding motion is crucial in physics - it's literally how... Show more
Physics229 views·Updated May 26, 2026·3 pagesGCSE Physics Combined Science: Motion (P1) Notes
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Vectors and Scalars - The Foundation of Motion
Ever wondered why physicists are so fussy about direction? It's because some measurements need it, whilst others don't! Vector quantities have both size (magnitude) and direction - think of force, displacement, velocity, and momentum.
Scalar quantities only have size, no direction needed. These include mass, speed, distance, energy, and time. For example, saying "I walked 100m north" describes displacement (vector), but "I walked 100m" describes distance (scalar).
Here's something that trips many students up: displacement is the straight-line distance between your start and end points, whilst distance is the actual path you travelled. Because of curves and bends, displacement is usually less than the total distance covered.
Quick Check: Weight is a force that always acts towards Earth's centre - that's why it's a vector quantity measured in Newtons!
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Speed, Distance, and Time Calculations
Calculating speed is straightforward once you know the formula: speed = distance ÷ time. This gives you metres per second , which you can rearrange to find distance travelled = speed × time.
For really fast-moving objects, scientists use light gates instead of stopwatches because they're much more accurate. You can also find speed from the gradient (slope) of a distance-time graph - the steeper the line, the faster the object.
Acceleration measures how quickly velocity changes, using the formula: acceleration = ÷ time. Remember, acceleration doesn't always mean getting faster - objects can decelerate (slow down) too!
Remember: Velocity is speed with direction, so even if a car maintains constant speed around a corner, it's still accelerating because its direction changes!
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Advanced Motion Equations and Gravity
There's a powerful equation that connects velocity, acceleration, and distance: (final velocity)² - (initial velocity)² = 2 × acceleration × distance. This is brilliant for solving problems when you don't know the time taken.
Gravity provides constant acceleration here on Earth - approximately 9.8 m/s² . This means any falling object speeds up by about 10 m/s every second, assuming no air resistance interferes.
Velocity-time graphs tell amazing stories about motion. A horizontal line shows constant velocity, whilst slopes show acceleration or deceleration. The area under the line gives you the total displacement travelled.
Top Tip: Don't confuse speed (scalar) with velocity (vector) - a car going around a roundabout at constant speed is actually changing velocity because its direction keeps changing!
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Physics229 views·Updated May 26, 2026·3 pagesGCSE Physics Combined Science: Motion (P1) Notes
S
Sofia@sofia_mnlj
Understanding motion is crucial in physics - it's literally how everything around you moves! This topic covers the essential concepts of vectors, scalars, speed, velocity, and acceleration that you'll need to master for your GCSE Physics exams.
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Vectors and Scalars - The Foundation of Motion
Ever wondered why physicists are so fussy about direction? It's because some measurements need it, whilst others don't! Vector quantities have both size (magnitude) and direction - think of force, displacement, velocity, and momentum.
Scalar quantities only have size, no direction needed. These include mass, speed, distance, energy, and time. For example, saying "I walked 100m north" describes displacement (vector), but "I walked 100m" describes distance (scalar).
Here's something that trips many students up: displacement is the straight-line distance between your start and end points, whilst distance is the actual path you travelled. Because of curves and bends, displacement is usually less than the total distance covered.
Quick Check: Weight is a force that always acts towards Earth's centre - that's why it's a vector quantity measured in Newtons!
2
of 3Sign up to see the content. It's free!
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Speed, Distance, and Time Calculations
Calculating speed is straightforward once you know the formula: speed = distance ÷ time. This gives you metres per second , which you can rearrange to find distance travelled = speed × time.
For really fast-moving objects, scientists use light gates instead of stopwatches because they're much more accurate. You can also find speed from the gradient (slope) of a distance-time graph - the steeper the line, the faster the object.
Acceleration measures how quickly velocity changes, using the formula: acceleration = ÷ time. Remember, acceleration doesn't always mean getting faster - objects can decelerate (slow down) too!
Remember: Velocity is speed with direction, so even if a car maintains constant speed around a corner, it's still accelerating because its direction changes!
3
of 3Sign up to see the content. It's free!
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Advanced Motion Equations and Gravity
There's a powerful equation that connects velocity, acceleration, and distance: (final velocity)² - (initial velocity)² = 2 × acceleration × distance. This is brilliant for solving problems when you don't know the time taken.
Gravity provides constant acceleration here on Earth - approximately 9.8 m/s² . This means any falling object speeds up by about 10 m/s every second, assuming no air resistance interferes.
Velocity-time graphs tell amazing stories about motion. A horizontal line shows constant velocity, whilst slopes show acceleration or deceleration. The area under the line gives you the total displacement travelled.
Top Tip: Don't confuse speed (scalar) with velocity (vector) - a car going around a roundabout at constant speed is actually changing velocity because its direction keeps changing!
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.
Similar content
Most popular content: Vector
4Most popular content in Physics
9Most popular content
9Can't find what you're looking for? Explore other subjects.
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