Which of the following is NOT a method to reduce friction?

Q. Which of the following is NOT a method to reduce friction?
Answer: throwing sand on the ground
Notes: Some of the ways of reducing friction are: 1. By polishing 2. By lubrication 3. By proper selection of materials 4. By streamlining 5. By using ball bearings

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📌 Question Number: 14 in Physics GK 04 - Motion & Friction in the above course in App.