Question

Give reasons:
a) A car skids on a wet ground.
b) Ball bearings are used between moving parts
c) It is easier to push an empty trolley than a trolley filled with books.

Answer 1

ANSWER:

a) A car skids on a wet ground as the surface area is very slippery so the tires slip on them.

b) Bearings reduce the friction of certain moving parts by replacing sliding friction with rolling friction. They are used to provide better linearmotion or rotation around a fixed axis.

c) Heavier objects have more inertia than lighter objects. So, inertia of an object depends on its mass. Thus, thebox filled with books has more inertia than the empty box due to which it it is easier to push an empty box than a box full of books.

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