In our everyday lives, we measure a thousand times. Whether, it’s our smartphone or our body weight that our legs carry, we wish to remain updated invariably. Thus, we are rationally surrounded by various kinds of scales. Spring scale is one of them, indeed an effective one.
One would find it difficult to measure own weight with a spring scale. However, when it comes to determining the force exerted on an object, spring scale also known as newton meter is the most commonly used tool. You might be wondering, what does a spring scale measure? The answer is, virtually everything.
Works on the principle of Hooke’s law, it effectively measures anything hangs on it. Till date the largest of its kind can measure 5000 to 8000 newton’s and can be labelled in with both units of force as well as mass.
How does a spring scale functions?
The name itself gives a clear indication of how this measuring tool functions. Spring scale has a spring attached at one end (usually at the top end). On the other, a hook which means to attach the object that will be weighed, at the other end.
Hooke’s Law – on which a spring scale works, states that the force required to stretch a spring is directly proportional to the extent the spring is expanded from its actual positioning. Hence, the markings on the scale are spaced equally.
Comes in various shapes and sizes, therefore, measuring capacity also vary. To get an accurate reading it is highly advised to place it somewhere where the spring axis can get a constant acceleration. Any deviation can result in inaccurate measurements.
What does a spring scale measures?
Let’s have a look at what a spring scale measures. One might think that it pretty much easy it measures weight, however things aren’t that simple. Spring scales these days are being used for various purposes. Some measure the force of a load. While, some are designed to measure the mass of objects.
Most of the scale show result in Newton. But, scale that measure the mass of the object produce results in grams. And, there is a combined scale that has the capability of calculating in both Newton and Gram. In that case you will have the gram scale stationed on one side and the Newton scale on the other.
Whenever it comes to weigh heavy loads, for example, trucks, stuffs carried on a conveyor belt or storage silos spring scales are incomparable. Besides, in educational institutions, teachers use this to train pupils about basic acceleration. In addition to that, when other measurement tools fail to yield precision hanging spring scales stand tall to assist you.
Should you put a weight on a spring scale and wish to weigh both the scale and the weight on another scale, it’s highly likely that you would get a similar reading. In general the upper scale yields a slightly higher reading owing to the weight of the second scale.
Few things one need to know prior of buying a spring scale
In spite of being one of the most common tools of measurement people still do have a lack of understanding regarding what to look for in spring scale. It’s simple. To get your best fit just have a close look at only two features.
- Size and shape
The measuring capability of a spring scale largely depends on its size. Scales those are small in size measures in Newton. Besides, have a less firm spring installed. Thus, can only be able to conduct small measurements.
The larger ones, on the other hand, are equipped with firmer spring. As a consequence, those scales effortlessly measure weight of tens, hundreds, and even in some cases thousands of Newtons.
These scales come with various unit readings. Often, devices come with both units of force as well as mass. Where, force refers to Poundals and Newtons, and mass refers to grams or kilograms and pounds. Under this circumstance you must know that only the values of force are labeled accordingly.
Moreover, for the purpose of ensuring accurate reading, the object that is being measured should be hung in the spring in an inertial reference frame. Apart from the balance itself any kind of interaction with other object will result in inaccurate readings.
Degree of accuracy of spring scale
Owing to the susceptibility of spring environmental changes sometimes make it to compromise in measurement accuracy. Remember, spring scales measure weight by hanging the item on a hook and pulling down. However, when deployed in a surrounding where the environment has a lesser impact you are about to get the exact precision required.
Furthermore, inaccuracy of lower than 0.2% is feasible, should a compensation is made for the alterations in spring properties. Depending on the manufacturing design of the scale a weight of between 0.5 kilograms to 10 tons can be weighed with precision.