Question

Out of the following the lubricant to be used in the moving parts of a machine is
(b) air
(s)_chalk powder (d) turpentine oil
Smooth surface has
(b) more frictional force
a les frictional force
1 Sometimes less and sometimes more force (d) all the above
To convert the static or sliding friction into rolling friction, the heavy luggage carriers are attached
at their base
(b) chains
(c) tyres
(d) wheels
laj ball bearings​

Answer 1

Answer:

d) turpentine oil

less friction

ball bearings

Answer 2

Answer:

a ball biarring as ball bearing will not be oil regular the cycle will not move smoothly