The city is using sand trucks to place sand on the road during icy conditions. Which best explains the use of sand? The sand increases friction by increasing surface area. The sand increases friction by

The city is using sand trucks to place sand on the road during icy conditions. Which best explains the use of sand?

The sand increases friction by increasing surface area.
The sand increases friction by increasing roughness.
The sand decreases friction by increasing surface area.
The sand decreases friction by increasing roughness.

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