Question

UIJ Lowli, llewspaper, .
4. Ball bearings are used to :
(a) increase friction
(b) decrease friction (c) optimize friction
5. The use of lubricants makes the surface
(a) smooth
(b) rough
(c) very rough
(d) All of these
(d) none of these​

Answer 1

Answer:

4. b) Decrease Friction

5. a) Smooth