Question

we can increase friction by

1. polishing
2. making groove and treads
3. applying fine power on
surface
4. using ball bearing​

Answer 1

Answer:

1

Explanation:

polishing

is correct answer

Answer 2

Answer:

2. making grove and treads....

Explanation:

polishing as in shoe polishing

applying fine powder as in carrom board,

using ball bearing as in the wheels of suitcase are used to reduce the friction...

hence the correct option is 2

hope it helps buddy