Question

10. Ways to reduce friction a. Streamlining b. Grooves c. Treads d. None of these

11. Friction always acts in a. Upward direction b. Downward direction c. In the direction of motion d. opposite to the direction of motion​

Answer 1

Answer:

10.d. None of these

11.d. opposite to the direction of motion

Mark me as brainliest