Question

which of these reduce friction between two object
(1) use of wheel and roller
(2) use of lubricant
(4) changing the colour of vehicles
(3) smoothening the surface of contact
option :-
(1) only first and second
(2) only second, third and forth
(3) only first, second and third
(4) only second and forth​

Answer 1

Answer:

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Answer 2

Answer:

2

Explanation:

use of lubricant

it makes it easier to work