sliding frictionlock the rollers of a roller
Sliding friction
Lock the rollers of a roller skate by criss-crossing rubber bands more than them on both sides. Place the roller skate on a sloping board and reminder how the friction of the rubber keep it from sliding.
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sliding frictionlock the rollers of a roller skate by criss-crossing rubber bands more than them on both sides place the roller skate on a sloping
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