6. Arrange static friction, rolling friction and sliding friction in increasing order.
7. How does a lubricant reduce friction?
8. How can you increase friction?
9. Why do airplanes have a streamline shape?
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6. rolling friction<sliding friction<static friction
7. A lubricant fills the ridges in the material making it smooth?
8. One can increase the friction by excessive polishing/lubricating.
9. Airplanes have a stream line shape in order to reduce drag(friction experienced in air)
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