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🛑 Friction on Different Surfaces

Find out why you slide on ice but grip on sandpaper: rough surfaces make lots of friction and smooth ones make little — and how friction helps us stop and even makes heat.

3
lessons
~15 min
to learn
🔬 Science
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. What Is Friction?Understand that friction is a force that slows movement when surfaces rub.Friction is a force that slows moving things down when two surfaces rub together. It always pushes against the direction of movement. Rough surfaces make more friction and smooth surfaces make less.
  2. Rough and SmoothCompare how much friction rough and smooth surfaces make.Rough surfaces like sandpaper, carpet and grass make lots of friction, so things grip and slow quickly. Smooth surfaces like ice and polished floors make very little friction, so things slide a long way. Shoes and tyres are made rough on purpose to grip.
  3. Friction Helping and HinderingGive examples of friction helping us grip and stop, and of it making heat.Friction helps our shoes grip and lets brakes stop a bike. It can also slowly wear surfaces away, and it turns movement into heat, which is why rubbing your hands warms them up.

Questions this course answers

What does friction do to a moving object?

Friction is a force that slows moving things down when two surfaces rub together.

Which surface makes the MOST friction?

Rough surfaces like sandpaper make the most friction, so things slow down quickly on them.

Why do things slide a long way on ice?

Ice is smooth, so it has very little friction, letting things slide a long way.

Why do shoe soles and tyres have a rough, bumpy pattern?

The rough pattern makes extra friction so shoes and tyres grip the ground and do not slip.

How does friction help a bike stop?

Friction between the brake and the wheel slows the bike down until it stops.

Rub your hands together quickly and they feel...

Friction can turn movement into heat, so rubbing your hands makes them feel warmer.

Grounded in trusted sources

  • BBC Bitesize — Friction
  • Britannica Kids

Every Wunder lesson is built from real, reputable sources — never invented.

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