Why m.N is not a Unit of Torque

[azizlwl]

Why unit of torque is not m.N

1.Torque=rFSinθ =>m.N
2. 1 N.m = 1 Joule but 1 N.m in torque ≠ 1 Joule

For the above 2 reasons i reckon it should have unit of m.N.

 

[tiny-tim]

hi azizlwl!

a Newton-metre and a joule are the same thing

but we tend to use one for torque and the other for energy, to avoid confusion

see http://en.wikipedia.org/wiki/Joule#Confusion_with_Newton_metre …

The use of Newton-metres for torque and joules for energy is useful in helping avoid misunderstandings and miscommunications​

(there are other units that describe more than one thing …

for example, the pascal is a unit both of pressure and of energy density )

 

[CAF123]

I read somewhere that we define the unit of torque as N m rather than m N, as the latter makes one want to say 'milli Newton'.

 

[sophiecentaur]

A 'foot pound' was chosen, historically and arbitrarily, as the unit of work and a 'pound foot' was chosen as the unit of torque. When we went metric, the same convention regarding the order of force and distance was used. If it hadn't, then this forum would be cluttered with complaints about it - just like the whinges regarding the accepted direction of conventional electrical current.

 

[PJC01]

I would like to clarify that m.N is not a unit of torque because torque is defined as the measure of the force that causes an object to rotate about an axis. It is a vector quantity, meaning it has both magnitude and direction. On the other hand, m.N is a product of two different units - meters and Newtons. It does not have a specific direction and does not represent a rotational force.

Additionally, the unit of torque is not m.N because it does not follow the standard International System of Units (SI). The SI unit of torque is the Newton-meter (N.m), which is derived from the fundamental units of force (N) and distance (m). This unit is equivalent to a Joule (J), which is the unit of work or energy. However, torque and energy are two distinct physical quantities and cannot be used interchangeably.

In summary, the unit of torque is not m.N because it does not accurately represent the physical quantity of torque and does not follow the standard SI system. It is important to use the correct units in scientific measurements to ensure accuracy and consistency.