Question

5.Which of these does not reduce friction? *

A. Carrom powder

B. Making the surface rough

C. Oiling machine parts

D. Grease

Answer 1

Making the surface rough

Hope it helps ❤️

Answer 2

$\blue{\bigstar} \: \: {\large{\pmb{\sf{\underline{Answer... \: :)}}}}}$

Grooving increase the roughness of the surface, so it will increase friction rather than decreasing it.

so the correct option is option 'b'.

$\blue{\bold{\underline{\underline{Shadiya\: here}}}}$