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The scale on top would read slightly heavier due to also supporting the weight of the lower scale itself. Spring balances come in different sizes. Generally, small scales that measure newtons will have a less firm spring (one with a smaller spring constant) than larger ones that measure tens, hundreds or thousands of newtons or even more ...
A spring scale measures mass by reporting the distance that a spring deflects under a load. This contrasts to a balance , which compares the torque on the arm due to a sample weight to the torque on the arm due to a standard reference mass using a horizontal lever .
An example of an electrical force gauge is an "electronic scale". One or more electrical load cells (commonly referred to as "weigh bars") are used to support a vertical or horizontal "live load" and are solid-state potentiometers which have variable internal resistance proportional to the load they are subjected to and deflected by.
The ASTM D2240 standard recognizes twelve different durometer scales using combinations of specific spring forces and indentor configurations. These scales are properly referred to as durometer types; i.e., a durometer type is specifically designed to determine a specific scale, and the scale does not exist separately from the durometer.
In physics, Hooke's law is an empirical law which states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring.
Each manufacturer used a different arbitrary scale to describe mainspring sizes, but these sizes are usually based on the French inch. Figure 2: Martin mainspring slit gauge. Actual size 87 x 17 mm. A better method for measuring strength is to use a slit gauge, Figure 2, with which the thickness of the mainspring is measured directly.
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Many weighing scales may be regarded as simple gravimeters. In one common form, a spring is used to counteract the force of gravity pulling on an object. The change in length of the spring may be calibrated to the force required to balance the gravitational pull.