[Physics] Why are some surfaces slippery

frictionwater

Why are ice and oil slippery? In general, why do certain substances make a surface difficult to walk on?

Best Answer

One word really: friction.

Surfaces that are "slippery" or difficult to walk on have much smaller coefficients of static and kinetic friction. Static friction is why its hard to get things moving and kinetic friction is what slows things down once they start moving.

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