Why is braking less effective on a wet road than on a dry road?

Cars & Vehicles
Science

Two reasons. The wet road has a lower coefficient of friction that the dry one. It is more slippery. The same goes for the brakes. If they are wet, they will be less effective because of the same reason. A higher amount of friction wastes more energy, in this case momentum, causing a loss of speed.

http://en.wikipedia.org/wiki/Friction

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