Question

Why?
(a) Machines are oiled from time to time.
(b) An object thrown upwards comes down after reaching a point.
(c) Powder is sprinkled on a carrom board.
(d) The ramp at a railway station has a rough surface.

Answer 1

the answer is
a) to decrease the friction
b) due to gravity
c)to reduce the friction...
d)to increase tge friction...in order to have a tight grip on the floor...

hope it helps
plz mark my answer as brainliest if it helps u

Answer 2

Hey dear,

● Answers -

(a) Machines are oiled from time to time *so that friction will be minimum.*


(b) An object thrown upwards comes down after reaching a point *as the gravitational force pulls it down.*

(c) Powder is sprinkled on a carrom board *for smooth movement of coins.*

(d) The ramp at a railway station has a rough surface *so that train doesn't slide off from the ramp.*

Hope this helps you...