Why is there so much friction in sandpaper?

Why is there so much friction in sandpaper?
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Seating the brushes on a D.C. motor is first accomplished using ________________. A. a file for cutting the approximate curvature followed by sandpaper for the final fit B. sandpaper with the motor not operating and then a seating stone while running the machine C. emery paper for the initial cut and crocus cloth for the finishing cut D. course lapping compound, followed by a medium and then a fine grade

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For routine cleaning of a commutator, you should apply _____________. A. course sandpaper in a slow back and forth motion across the commutator slots B. an emery cloth parallel to the axis of the machine C. a canvas wiper to the machine while running D. cotton swabs between the commutator bars

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