There will be one scientific principle behind the working of
every product. Analysing a product is a great way of learning.
When the scrap paper vendor who collected old news papers
from my house, he used his hand to measure the weight of the paper. But i told,
we have an instrument to measure the weight and i showed him this instrument.
And it showed 3 Kg more than what he told. He was resistive
to that but finally he settled 2 kg more. We also didn’t bargain much.
Now how it is working and can we trust this instrument?
This instrument is designed and made with a rod of varying
diameter. A piece of rope tied around the rod, is used to balance the rod. When
the rope is at the centre of mass, the mass of the rod on both side of the rope
will balance each other and become horizontal. This point will be marked as
reference or zero weight. The rope should move towards the hook side and
balance horizontally in order to weigh the objects.
When we add a weight centre of mass will change. Then if the
rope is in the new centre of mass again rod will be balanced horizontally. The
rod should be pre calibrated for getting the actual measurement.
This is clever and simple instrument for measuring the
weight.
The main disadvantage of this instrument is we cannot add
more weight as it will become too heavy to lift and balance.
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