A spring scale, spring balance or newton meter is a type of mechanical force gauge or weighing scale. It consists of a spring fixed at one end with a hook to attach an object at the other. It works in accordance with Hooke's Law, which states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance. Therefore, the scale markings on the spring balance are equally spaced.
A spring scale
A spring balance can be calibrated for the accurate measurement of mass in the location in which they are used, but many spring balances are marked right on their face "Not Legal for Trade" or words of similar import due to the approximate nature of the theory used to mark the scale. Also, the spring in the scale can permanently stretch with repeated use.
A spring scale will only read correctly in a frame of reference where the acceleration in the spring axis is constant (such as on earth, where the acceleration is due to gravity). This can be shown by taking a spring scale into an elevator, where the weight measured will change as the elevator moves up and down changing velocities.
If two or more spring balances are hung one below the other in series, each of the scales will read approximately the same, the full weight of the body hung on the lower scale. 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 depending on the scale of newtons used. The largest spring scale ranged in measurement from 5000–8000 newtons.
A spring balance may be labeled in both units of force (poundals, Newtons) and mass (pounds, kilograms/grams). Strictly speaking, only the force values are correctly labeled. In order to infer that the labeled mass values are correct, an object must be hung from the spring balance at rest in an inertial reference frame, interacting with no other objects but the scale itself.
Main uses of spring balances are to weigh heavy loads such as trucks, storage silos, and material carried on a conveyor belt. They are also common in science education as basic accelerators. They are used when the accuracy afforded by other types of scales can be sacrificed for simplicity, cheapness, and robustness.
A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.
Historyedit
The first spring balance in Britain was made around 1770 by Richard Salter of Bilston, near Wolverhampton.[1] He and his nephews John & George founded the firm of George Salter & Co., still notable makers of scales and balances, who in 1838 patented the spring balance. They also applied the same spring balance principle to steam locomotive safety valves, replacing the earlier deadweight valves.[1]
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February 15, 2024
spring, scale, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, february, 20. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Spring scale news newspapers books scholar JSTOR February 2022 Learn how and when to remove this template message A spring scale spring balance or newton meter is a type of mechanical force gauge or weighing scale It consists of a spring fixed at one end with a hook to attach an object at the other It works in accordance with Hooke s Law which states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance Therefore the scale markings on the spring balance are equally spaced A spring scaleA spring balance can be calibrated for the accurate measurement of mass in the location in which they are used but many spring balances are marked right on their face Not Legal for Trade or words of similar import due to the approximate nature of the theory used to mark the scale Also the spring in the scale can permanently stretch with repeated use A spring scale will only read correctly in a frame of reference where the acceleration in the spring axis is constant such as on earth where the acceleration is due to gravity This can be shown by taking a spring scale into an elevator where the weight measured will change as the elevator moves up and down changing velocities If two or more spring balances are hung one below the other in series each of the scales will read approximately the same the full weight of the body hung on the lower scale 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 depending on the scale of newtons used The largest spring scale ranged in measurement from 5000 8000 newtons A spring balance may be labeled in both units of force poundals Newtons and mass pounds kilograms grams Strictly speaking only the force values are correctly labeled In order to infer that the labeled mass values are correct an object must be hung from the spring balance at rest in an inertial reference frame interacting with no other objects but the scale itself Contents 1 Uses 2 History 3 See also 4 References 5 External linksUses edit nbsp Example of spiral balancer for Sash windowMain uses of spring balances are to weigh heavy loads such as trucks storage silos and material carried on a conveyor belt They are also common in science education as basic accelerators They are used when the accuracy afforded by other types of scales can be sacrificed for simplicity cheapness and robustness A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring History editThe first spring balance in Britain was made around 1770 by Richard Salter of Bilston near Wolverhampton 1 He and his nephews John amp George founded the firm of George Salter amp Co still notable makers of scales and balances who in 1838 patented the spring balance They also applied the same spring balance principle to steam locomotive safety valves replacing the earlier deadweight valves 1 See also editWeighing scaleReferences edit a b Hewison Christian H 1983 Locomotive Boiler Explosions David and Charles p 18 ISBN 0 7153 8305 1 External links edit nbsp Wikisource has the text of the 1905 New International Encyclopedia article Spring Balance nbsp Media related to spring balance at Wikimedia Commons nbsp Media related to spring scales at Wikimedia Commons Retrieved from https en wikipedia org w index php title Spring scale amp oldid 1166698107, wikipedia, wiki, book, books, library,
