how is mass of an object determined using a beam balance
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A beam balance does not measure mass; it measures weight.
The gravitational force of attraction between the earth and an object depend on the mass of the object.
F=GMmR2
F=GMmR2
where GG is the universal gravitational constant, MM is the mass of the earth, mm is the mass of the object and RR is the radius of the earth.
For convenience sake, we define a new quantity called acceleration due to gravity which does not depend on the mass of the object (therefore, has the same value for all the objects).
g=GMR2
g=GMR2
Using the above simplification, we say:
F=mg
F=mg
The beam balance measures the force FF exerted by the mass on the beam balance. The beam balance does not directly measure the mass. It uses the fact that the gravitational force on the object is proportional to its mass.
So what if you try to lift the object while it is being measured? You are reducing its weight, right? Does the beam balance read a smaller value?
Yes!
Explanation:
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