The use of skis helps a person to slide smoothly over snow because the skis ____________.

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Solution

The use of skis helps a person to slide smoothly over snow because the large area of the skis reduces the pressure on the snow and prevents the person from sinking into the snow.
The force acting on a unit area of a surface is called pressure. So, the larger the area, the smaller the pressure on a surface for the same force.

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