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How does friction work?
Quick answer
Friction works at the microscopic level: even surfaces that look smooth are covered in tiny bumps that catch on each other. When you slide one surface over another, those bumps interlock and resist — and the harder the surfaces press together, the stronger the grip.
Step by step
- Tiny surface bumps catch and interlock.
- Harder pressing means more friction.
- Static friction holds; kinetic friction slows sliding.
- The resistance turns movement into heat.
People also ask
How does friction work?
Microscopic bumps on two surfaces catch on each other; sliding must overcome that grip, which resists motion and creates heat.
Why is it harder to start sliding than to keep sliding?
Static friction (at rest) is stronger than kinetic friction (already moving), so the first push needs more force.
Why does rubbing make heat?
Overcoming friction converts movement energy into heat at the contact surfaces.
Part of the guide: Everyday Science: Light, Heat & Matter →