SI unit of Force is in Newtons (N). 1 Newton is equal to 1 kg*m*s^-2. The basic formula for force is F=ma where F stands for force, m stands for mass in kilograms and a stands for acceleration in m*s^-2. This is the Newton's second law of motion. Show
Atkinds, Peter. Physical Chemistry. 9th. Oxford University Press, 2009. Print. The Newton is the SI unit of force. Strictly defined: the force that will give a mass of 1 kilogram an acceleration of 1 meter per second per second. It is not in everyday use. When did you last read a recipe that required you to add one newton of flour to a cake mixture? There is no logical reason for not doing so. A force of 1 Newton on the balance pan is approximately the force exerted downwards by 100 grams of flour on the pan. So why not use kilograms per square metre also for the stress strain diagram? The pompous answer is that using Newtons allows this diagram to be used on a distant planet with a different mass. Weight is the expression of the force exerted by the earth on the mass of an object. The mass is the fundamental quantity, the weight, even on earth, varies with the position of the object. On the moon, 100 grams of flour would make a very big cake, if you measured it with a spring balance. 1 Newton of flour would work just like on earth. This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License. A force is a push, pull, or dragging on an object that changes its velocity or direction. A unit of force is an arbitrary measurement that we designate as "1" (unit), so that all other measurements of force are multiples of that unit. Most often, force is designated as a newton (N) in the metric or SI system of measurement. The newton has applications in various scientific measurements. There are other units, not used as often. Questions you may have include:
This lesson will answer those questions. Useful tool: Units Conversion Definition of newtonA newton is the force required to give a mass of 1 kilogram (1 kg) an acceleration of 1 meter per second per second (1 m/s2). It is abbreviated as N. This unit of measurement is in the metric or SI system and is used in scientific work more than other units of force.
Applications of the newtonThe newton combined with other measurements is used in various applications. Moment of forceThe unit of torque or moment of force is the newton-meter (N-m), where m is the moment arm. Energy, work and heatThe newton-meter (N-m) is also the definition of the joule (J), which is a unit of energy. It can be seen that the units of kinetic energy E = ½mv2 are in kilogram-meter2/seconds2 and kg-m2/s2 = N-m. Power and radiant fluxPower is energy per second or N-m/s, with the unit of watt. This is also the unit for radiant flux or power from electromagnetic radiation. PressureThe unit of pressure is the pascal (P), which is the force per unit area (N-m2). Other units of forceThere are other units of force, not as commonly used as the newton. DyneA dyne is the force required to give a mass of 1 gram (1 g) an acceleration of 1 centimeter per second per second (1 cm/s2). 1 N = 100,000 dynes. You might use the dyne, if working with small objects. Poundal and poundA poundal is the force required to give a mass of 1 pound (1 lb) an acceleration of 1 foot per second per second (1 ft/s2). 1 poundal equals 0.1382 newtons. A pound is the force applied on a mass of 1 pound (1 lb) by the acceleration due to gravity. It is a non-technical unit of force and is also called the weight. These units of force are in the English system and are seldom used in scientific measurements. SummaryA force acts on an object to change its velocity or direction. In most scientific work, force is designated as a newton (N) in the metric or SI system of measurement. The newton has applications in various scientific measurements. There are other units, not used as often. Be forceful in your actions Resources and referencesRon Kurtus' Credentials WebsitesPhysics Resources Books(Notice: The School for Champions may earn commissions from book purchases) Top-rated books on Physics Top-rated books on Physics of Force Share this pageClick on a button to bookmark or share this page through Twitter, Facebook, email, or other services: As per the second law of motion proposed by Newton, force is defined or expressed as the product of mass and acceleration. In both the SI system (the International System of Units) and in the MKS system, the unit of mass is kilogram, abbreviated as kg, and the unit of acceleration is m/s². Therefore, the unit of force is kg m/s², which is what we refer to as Newton or N. In the CGS system of units, the unit of mass is gram or g, and the unit of acceleration is cm/s². Therefore, the CGS unit of force is g cm/s², which is called dyne or Dyn. In the FPS system of units, the unit of mass is pound or lb, and the unit of acceleration is feet per second squared or ft/s². Therefore, the FPS unit of force is lb-ft/s², which is called poundal or pdl. Derivation of SI Unit of Force:From Newton’s Second Law of motion, force is equal to the rate of change in momentum (P). We also know that momentum (P) is the product of mass(m) and velocity(v) . Force = Rate of change of momentum = P/ t {where P stands for momentum and t for time} = mv/ t { P= mv} Force= mass*velocity / time -- (replacing terms with their respective units) Newton = (kg*m)/sec⁻² Where, Unit of Force = Newton Unit of mass = Kilogram Unit of time = Second Unit of velocity = Metre / Second NOTE: Displacement is the shortest distance from the initial to the final point. Inshort,displacement is distance in vector form(same as how velocity is speed in vector form), So displacement is measured in metres. Other Units of Force:There are two other units of force in Physics; however, they are not as commonly used as the SI unit of force Newton.
What is Force? Force is an external agent that is applied to a body to change the state of a body, speed of the body, direction of the body or position of the body. Force is a vector quantity, it has both magnitude and direction. The direction towards which the force is applied is known as the direction of the force and the application of force is the point where force is applied. It is measured using a spring balance and the unit in which force is measured in Newton(N). What are the Effects of Force?
Force Formula DerivationForce is a product of mass and acceleration. It is a vector quantity that has both magnitude and direction. F=ma Where F= Force m= Mass a= Acceleration Acceleration can be defined as the rate of change of velocity of an object in a particular specified time. It can be expressed as, a= v/t Where v= Velocity t= Time So, Force can be rewritten as, F=mv/t It is known that P=mv, where p is the momentum, Therefore, F= p/t = dp/dt Force formula is helpful in finding out the force, mass, acceleration, momentum, velocity in any given problem. Force is represented as, Force = (Mass)(Acceleration) Unit of force is Newton Unit of Mass is Kilograms Unit of Acceleration is Meter/second^2 Types of ForcesThe two categories of forces are- Contact forces and non-contact forces Forces that are directly in touch with the body where the force is to be applied or is in touch through a medium are known as contact forces such as muscular forces, mechanical force or frictional force. Forces that act without any medium or any direct contact with the body are termed as non-contact forces and under these forces are Magnetic forces, Electrostatic forces, gravitational forces etc. The International System of units is an internationally accepted metric system established in 1960, the standard for measurement which is approved by scientific researchers everywhere making it easier for people to understand or express the magnitude or quantity of a natural phenomenon.
There are a total of 7 base units and 22 derived units.
S. No Quantity SI Unit SI Unit Symbol 1 Length Metre m 2 Mass Kilogram kg 3 Time Second s 4 Electric Current Ampere A 5 Thermodynamic Temperature Kelvin k 6 Amount of substance Mole mol 7 Luminous intensity Candela cd Other Units of ForceForce is measured in kilograms and is denoted by kg. However, there are also smaller measures called the cgs system. If we talk about force in a centimetre gram second system of unit CGS units, it is measured in dynes and is denoted as gf. |