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Slippery Roads
Why is ice so slippery?
When water freezes on a road, it makes a smooth layer of ice. Ice is very slippery because there's almost no friction — friction is the force that slows things down. That's why cars slide on icy roads! People put salt on roads because it melts the ice and brings back friction.
Fun Fact: Penguins waddle because it helps them not slip on ice! They are friction experts.
Tap "Push!" to see how friction works on ice vs dry road!