We can increase the friction by -
1) Polishing
2) Making grooves and treads
3) Streamlining
4) Using ball bearing
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3) Streamlining
There are two methods of increasing friction: one is by making the surfaces rough and the other by increasing the mass of the object that is moving. For example, the tyres of vehicles have treads (these are the 'designs' that you can see on the tyre surface), which increase the friction between the tyre and the road.
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3
Answer:
The answer can be 2) Making Grooves And Treads but 3rd and 4th also have some possibility.
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