Instruct: Given a question, retrieve documents that answer the question.
Query: What is the unit of measurement for force?
In physics, a force is any interaction that, when unopposed, will change the motion of an object.[1] A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
The "Act" sets forth the regulation of measurements and the commerce conducted using measuring devices. The "Act" provides that the International System of measurement be used with what the act calls "Customary units used with the international system" such as hour, minutes, litres, hectares, tonne or metric ton.
In addition, the "Act" allows usage of what it labels as "Canadian units" (the imperial system), such as miles, inches, imperial gallons, and acres. In SCHEDULE III - section 5, the "Act" also provides for the usage of certain French units in what it labels as "UNITS OF MEASUREMENT TO DESCRIBE CERTAIN LAND IN QUEBEC". The five permitted old French units are the foot (the French foot of 12.789 inches), arpent (for both length and area), and perch (for both length and area).
The U.S. military uses metric measurements extensively to ensure interoperability with allied forces, particularly NATO Standardization Agreements (STANAG). Ground forces have measured distances in "klicks", slang for kilometers, since 1918. Most military firearms are measured in metric units, beginning with the M-14 which was introduced in 1957, although there are a few legacy exceptions, such as .50-caliber guns. Aircraft ordnance is normally measured in pounds. Heavy weapon caliber is measured in millimeters. Military vehicles are generally built to metric standards. An exception is the U.S. Navy, whose guns are measured in inches and whose undersea fleet measures distances in terms of "kiloyards" (equivalent to 914.4 m), depth as "feet", and velocity, in some cases, as "feet per second". The Navy and Air Force continue to measure distance in nautical miles and speed in knots; these units are now accepted for use with SI by the BIPM. Furthermore, in military aviation NATO countries use feet for flight heights, as they do in the civilian aviation.
A number of locally-specific units of measurement were used in the territory of what is now the Czech Republic to measure length, area, capacity and so on. In 1876, the metric system was made compulsory; however, local measurements and old Viennese measurements were still in use.
In science and technology, an arbitrary unit (abbreviated arb. unit, "see below")
or procedure defined unit (p.d.u.)
is a relative unit of measurement to show the ratio of amount of substance, intensity, or other quantities, to a predetermined reference measurement. The reference measurement is typically defined by the local laboratories or dependent on individual measurement apparatus. It is therefore impossible to compare "1 arb. unit" by one measurer and "1000 arb. unit" by another measurer without detailed prior knowledge on how the respective "arbitrary units" were defined; thus, the unit is sometimes called an unknown unit. The unit only serves to compare multiple measurements performed in similar environment, since the ratio between the measurement and the reference is a consistent and dimensionless quantity independent of what actual units are used.
Units of such kind are commonly used in fields such as physiology to indicate substance concentration, and spectroscopy to express spectral intensity.
As it is difficult to obtain direct measures of the interior forces that the molecules of the body exert on each other, Clausius states that an indirect way to obtain quantitative measures of what is now called entropy is to calculate the work done in overcoming internal forces:
The Gurley unit is a measure of the stiffness of a material. Since the measurement device holds a piece of material vertically and tests the force required to deflect the material a given amount. One Gurley unit is equivalent to one milligram of force
, however the Gurley unit also implies measurement with this apparatus. A related unit, the Taber, is highly correlated but uses a different apparatus (manufactured by Taber Industries) for performing measurements.
In 1792 the southern part of the Netherlands was incorporated into the First French Republic and in 1807 the rest of the Netherlands was incorporated into what had now become the First French Empire and as a result the Netherlands was forced to accept the French units of measurement. In 1812 France replaced the original metric system with the mesures usuelles.
The source measure unit (SMU), or source-measurement unit as it is sometimes called, is an electronic instrument that is capable of both sourcing and measuring at the same time. It can precisely force voltage or current and simultaneously measure precise voltage and/or current.
Research into the measurement of empathy has sought to answer a number of questions: who should be carrying out the measurement? What should pass for empathy and what should be discounted? What unit of measure (UOM) should be adopted and to what degree should each occurrence precisely match that UOM are also key questions that researchers have sought to investigate.
All these systems are coherent. One that is not is a three-unit system (also called English engineering units) in which "F" = "ma" that uses the pound and the pound-force, one of which is a base unit and the other, a noncoherent derived unit. In place of an explicit proportionality constant, this system uses conversion factors derived from the relation 1 lbf = 32.174 lb⋅ft/s. In numerical calculations, it is indistinguishable from the four-unit system, since what is a proportionality constant in the latter is a conversion factor in the former. The relation among the numerical values of the quantities in the force law is {"F"} = 0.031081 {"m"} {"a"}, where the braces denote the numerical values of the enclosed quantities. Unlike in this system, in a coherent system, the relations among the numerical values of quantities are the same as the relations among the quantities themselves.
In response to an instruction by Churchill of 10 June 1945, a follow-up report was written concerning "what measures would be required to ensure the security of the British Isles in the event of war with Russia in the near future". United States forces were relocating to the Pacific for a planned invasion of Japan, and Churchill was concerned that this reduction in supporting forces would leave the Soviets in a strong position to take offensive action in Western Europe. The report concluded that if the United States focused on the Pacific Theatre, Great Britain's odds "would become fanciful."
In 1873 a committee of the British Association for the Advancement of Science under the chairmanship of William Thomson (Lord Kelvin) introduced the concept of coherence into units of measure and proposed the names dyne and erg as the units of force and work in the CGS system of units. Two years later James Thomson, older brother of William Thomson, introduced the term poundal as a coherent unit of force in the Foot–pound–second system (FPS) of measurement. The FPS unit of work is the foot-poundal.
Other units are based on customary units, but use power-of-ten factors and metric prefixes. For example, distance to target for a U.S. submarine is expressed in kiloyards rather than some combination of miles, yards, and feet. Telephone transmission line length and loop distances are measured in kilofeet. In some fields of civil engineering (especially structural engineering), and architecture, large loads and forces (such as the weight of a building or the amount of load applied to a column) are measured in kips (kilopounds or 1000 pounds-force) instead of short tons-force (2000 pounds-force), which are used in virtually all other non-metric industries in the United States, as well as in common usage among the public, when dealing with large values of force.
The avoirdupois pound is legally defined as a measure of mass, but the name pound is also applied to measures of force. For instance, in many contexts, the pound avoirdupois is used as a unit of mass, but in some contexts, the term "pound" is used to refer to "pound-force". The slug is another unit of mass derived from pound-force.
The adoption of metric units has required some government compulsion and some have argued that such policies are wrong in principle. Compulsory standards of weights and measures go back as far as Magna Carta. In 1824 in Britain, the Weights and Measures Act (""An Act for ascertaining and establishing Uniformity of Weights and Measures"") consolidated the various gallons in use at the time and established a new imperial gallon, and prohibited the use of the older units, including what the United States now calls customary US measure.
Tenacity is the customary measure of strength of a fiber or yarn. In the U.S. it is usually defined as the ultimate (breaking) force of the fiber (in gram-force units) divided by the denier.
Because denier is a measure of the linear density, the tenacity works out to be not a measure of force per unit area, but rather a quasi-dimensionless measure analogous to specific strength. 
A tenacity of formula_1 corresponds to: formula_2
A force meter is an instrument to measure the magnitude of a force. This is often just a spring contained within a cylinder that has a scale to mark the extension of the spring produced by the force. In the International System of Units, the unit of force is the newton (symbol N). A force meter that measures force in newtons may be referred to as a newtonmeter.
The slug is a derived unit of mass in the weight-based system of measures, most notably within the British Imperial measurement system and in the United States customary measures system. Systems of measure either define mass and derive force or define a base force and derive a mass unit. A slug is defined as the mass that is accelerated by 1 ft/s when a force of one pound (lbf) is exerted on it.
"Buoyant Force Transducer": the buoyancy force produced by a float in a homogeneous liquid is equal to the weight of the liquid that is displaced by the float. Since buoyancy force is linear with respect to the density of the liquid within which the float is submerged, the measure of the buoyancy force yields a measure of the density of the liquid. One commercially available unit claims the instrument is capable of measuring relative density with an accuracy of ± 0.005 RD units. The submersible probe head contains a mathematically characterized spring-float system. When the head is immersed vertically in the liquid, the float moves vertically and the position of the float controls the position of a permanent magnet whose displacement is sensed by a concentric array of Hall-effect linear displacement sensors. The output signals of the sensors are mixed in a dedicated electronics module that provides a single output voltage whose magnitude is a direct linear measure of the quantity to be measured.
Because mass and weight are separate quantities, they have different units of measure. In the International System of Units (SI), the kilogram is the basic unit of mass, and the newton is the basic unit of force. The non-SI kilogram-force is also a unit of force typically used in the measure of weight. Similarly, the avoirdupois pound, used in both the Imperial system and U.S. customary units, is a unit of mass, and its related unit of force is the pound-force.
The results are stated in various ways, which can lead to confusion, especially when the actual units employed are often not attached. Overall, the resulting measure is always one of force. In the United States, the measurement is in pounds-force (lbf). In Sweden it is in kilograms-force (kgf), and in Australia, either in newtons (N) or kilonewtons (kN). This confusion is greatest when the results are treated as units, for example "660 Janka".
The IACHR helps many Human Rights Defenders get a measure of protection and interim measures for them and their families. Judges of the Supreme Court of Justice themselves had been forced to ask for interim protective measures from IACHR. They were being threatened for not ruling in the ‘right’ person’s favor during what came to be called the ‘para-politics’ cases in 2009, following the ‘official’ demobilization of the paramilitary forces.
In United States military security, Force Protection Condition (FPCON for short) is a terrorist threat system overseen by the United States Department of Defense directive, and describes the number of measures needed to be taken by security agencies in response to various levels of terrorist threats against military facilities, as opposed to DEFCON, which assesses the amount of military forces needed to be deployed in a situation with a certain likelihood of attack against the civilian population. The decision on what level of FPCON to implement is affected by the current threat of terrorism towards military facilities and personnel, the amount of security forces available, and current relationships between the United States and the world, which may affect the chances of an attack. FPCON was previously known as THREATCON, until it was renamed in June 2001 due to confusion with United States State Department system of threat assessment.
Scholars have grappled with the size of plots of land depicted. Cline created a chart with units of measurement, but was cautious about calculating the size of plots, since it was unclear what unit of measure was being used. Others also grappled with the problem of translating Nahua glyphs for units of measure in the OLM to modern measurements to calculate plot size. In 1991, H.R. Harvey published his argument that there were two different units of measurement depicted in the OLM, and made calculations based on his knowledge of Aztec arithmetic. Other scholars have continued to study the OLM's paleography.