Today we will see very basic term of engineering,
i.e. Mass and weight. My physics teacher, during my 10th standard, used
to say mass of an object and weight of an object and I used to get confuse at
that time. Mass and weight are not similar; both words are generally used each
day in engineering life.
Hence I have
decided to write one note over mass and weight for my friends those are just
started to enjoy the physics.
Mass
Mass of an object is basically defined as the amount
of matter in that object. Mass will always be constant at any location and at
any moment of time. Mass of an object will never be changed whether that object
is at earth or at moon or at any location because that object will have same
amount of matter.
Every object
will have mass and it could never be zero or we may say that if you are saying
that mass of a particular object is zero then its means that object does not
exist in this universe. Mass is a scalar physical quantity and its unit of
measurement is Kg in S.I unit system.
How you will calculate the mass of an object?
Force = Mass x acceleration
If we are applying 1 N force and object moves with
an acceleration of 1 m/s2, then mass of that object will be 1 kg.
Let us see weight, what is weight of an object?
Weight of an object is basically defined as the
force by which earth pulls that object towards its center. Hence we may say
gravity causes the weight of an object.
Weight = Mass x acceleration due to gravity
W = M x g
As we know that mass of object will always be
constant, hence weight of an object depends completely over the location as
acceleration due to gravity will changes depending on the location. We must be
aware that weight of an object depend will
be directional proportional with acceleration due to gravity.
Weight is a vector physical quantity as it will have one direction also with magnitude and the direction will be towards center of planet where we have placed the object.
Weight is a vector physical quantity as it will have one direction also with magnitude and the direction will be towards center of planet where we have placed the object.
Let us see below figure, where we may see that weight
of a person has two magnitudes in different condition however mass of that
person is constant.
Weight of an object might be zero depending on acceleration due to gravity at location where object is placed. Unit of
measurement of weight in S.I system is Newton which is indicated by “N”.
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