Friction
⭐ MasteredFriction is the force that slows things down when surfaces rub together. Rough surfaces make more friction than smooth ones.
Rubbing your hands together makes them warm because of friction.
All about Friction
Friction is a force that opposes movement when two surfaces rub together. It slows things down and can stop them. Friction happens between your shoes and the ground, between tyres and the road, and even between air and a moving car.
Rough surfaces create more friction than smooth ones. Friction also creates heat.
If you slide a book across a table, friction makes the book stop eventually. Friction is also what lets you walk without slipping, because your shoes grip the ground.
That is why tyres have tread and why car brakes use rough pads.
🎮 Try it yourself!
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Real-life uses of Friction
- Gripping the ground with rubber shoe soles and tyres
- Stopping a bicycle with brake pads
- Striking a match on the side of its box to create a flame
Frequently asked questions about Friction
Is friction always bad?
No. Friction helps us walk, hold objects and stop cars. Too much friction can waste energy, which is why engineers try to reduce it in machines.
How can you reduce friction?
Use smoother surfaces, add oil or grease, or use wheels and ball bearings to roll instead of slide.
Why do we need friction to walk?
Your shoes push backwards against the ground, and friction pushes you forwards. Without it your feet would slip.