Forces are everywhere around us, from the friction that stops...
Physics148 views·Updated 17 Jul 2026·2 pagesUnderstanding Contact and Non-Contact Forces
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Bardia Babajan@bardiababajan_qawn
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Contact & Non-Contact Forces
Ever wonder why you don't fall through your chair or how magnets work without touching? It's all about contact and non-contact forces, and they're simpler than you might think.
Contact forces need objects to physically touch each other to work. Think about pushing a door open - your hand has to touch the door to make it move. The three main contact forces you'll encounter are friction (like your shoes gripping the pavement), air resistance (what slows down a falling leaf), and tension (the force in a stretched rope or elastic band).
Non-contact forces are like invisible hands that can push and pull objects without touching them. These include gravitational force (what keeps you stuck to Earth), magnetic force (how magnets attract or repel), and electrostatic force (why your hair stands up after going down a plastic slide). The space around objects where these forces work is called a force field - imagine it as an invisible bubble of influence.
Quick Check: Look around your classroom right now. Can you spot examples of both contact and non-contact forces at work?
2
of 2
Understanding Mass and Force Fields
Here's something mind-blowing: Earth and the Moon are constantly pulling on each other, even though they're thousands of kilometres apart! This happens because the Moon sits within Earth's gravitational field.
Mass is simply how much stuff an object contains, measured in kilograms. Earth has a massive 6.0 × 10²⁴ kg of mass, whilst the Moon weighs in at 7.3 × 10²² kg - that's still incredibly heavy, but about 80 times lighter than Earth.
Mass is what scientists call a scalar quantity because it only tells us how much there is, not which direction it's pointing. You can't have "5 kg to the left" - it's just 5 kg, full stop.
Real-World Connection: This is why astronauts float on the Moon but don't fly off into space - the Moon's gravity is weaker than Earth's, but it's still there!
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Physics148 views·Updated 17 Jul 2026·2 pagesUnderstanding Contact and Non-Contact Forces
B
Bardia Babajan@bardiababajan_qawn
Forces are everywhere around us, from the friction that stops you sliding off your chair to the gravity keeping your feet on the ground. Understanding the difference between contact and non-contact forces will help you make sense of how objects...
1
of 2
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Contact & Non-Contact Forces
Ever wonder why you don't fall through your chair or how magnets work without touching? It's all about contact and non-contact forces, and they're simpler than you might think.
Contact forces need objects to physically touch each other to work. Think about pushing a door open - your hand has to touch the door to make it move. The three main contact forces you'll encounter are friction (like your shoes gripping the pavement), air resistance (what slows down a falling leaf), and tension (the force in a stretched rope or elastic band).
Non-contact forces are like invisible hands that can push and pull objects without touching them. These include gravitational force (what keeps you stuck to Earth), magnetic force (how magnets attract or repel), and electrostatic force (why your hair stands up after going down a plastic slide). The space around objects where these forces work is called a force field - imagine it as an invisible bubble of influence.
Quick Check: Look around your classroom right now. Can you spot examples of both contact and non-contact forces at work?
2
of 2Sign 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
Understanding Mass and Force Fields
Here's something mind-blowing: Earth and the Moon are constantly pulling on each other, even though they're thousands of kilometres apart! This happens because the Moon sits within Earth's gravitational field.
Mass is simply how much stuff an object contains, measured in kilograms. Earth has a massive 6.0 × 10²⁴ kg of mass, whilst the Moon weighs in at 7.3 × 10²² kg - that's still incredibly heavy, but about 80 times lighter than Earth.
Mass is what scientists call a scalar quantity because it only tells us how much there is, not which direction it's pointing. You can't have "5 kg to the left" - it's just 5 kg, full stop.
Real-World Connection: This is why astronauts float on the Moon but don't fly off into space - the Moon's gravity is weaker than Earth's, but it's still there!
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.
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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.
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Students love us — and so will you.
4.6/5App Store
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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
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