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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
How a weight machine measure normal reaction force and not the weight of the body?
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Udith
But how it measures the normal force it supplies to the object?
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Somnath
We feel weight due to the normal reaction force of the surface (on which we are standing) on us.When the reaction force is Zero we feel weight less,as in the case of free fall under gravity. Generally, a scale will measure the normal force it supplies to the object resting on it. When the scale is stationary , normal force is equal to mg, or the weight of the object. If the system is accelerating, the normal force (and thus the reading of the scale) will increase or decrease appropriately. However, this normal force is no longer equal to the weight. The scale of weight machine is calibrated in such a way that when the reaction force is 9.8N the machine shows 1 kg and the others weight are multiple of it.
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Paltu Sen Best Answer
see attachments...Here we assume a mass M is on a lift moving upward with an acceleration a . Fig (a) shows the forces on mass M from the reference frame of this mass and Fig(b) shows the forces with respect to an observer on the frame of reference of the spring of weighing machine. Both the observers see same forces. So if we can calculate the force w.r.t the 1st observer , we get the value w.r.t the 2nd one.