Icy roads are dangerous!

Friction is a force. No matter which direction something moves in, friction pulls it the other way. Move something left, friction pulls right. Move something up, friction pulls down.

Friction is actually a force that appears whenever two things rub against each other. Although two objects might look smooth, microscopically, they’re very rough and jagged.

As they slide against each other, their contact is anything BUT smooth. They both kind of grind and drag against each other. This is where friction comes from.

Sandpaper applies more friction than ice, thus ice is slippery. For example:

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