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What are the units for inertia?by miniradman
Tags: inertia 
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#1
May1112, 04:12 AM

P: 186

Hello there, there have been a lot of conflicts between my physics teachers and university lecturers about the the units for intertia. Some say there aren't any units for inertia, and others say that it's in n/s. However, I don't know who to believe anymore... thats why I'm here
Also, if there aren't any units for inertia, why is that? Also, does "moment of inertia" differ from "inertia"? If so, how and why? cheers  miniradman 


#2
May1112, 04:19 AM

P: 418

The unit for inertia is the same as the units for mass, kg, the unit of moment of inertia is $$ kg.m^{2}$$
Inertia is the resistance to linear acceleration by a force applied to the body. Moment of inertia is the resistance to angular acceleration by torque applied to the body. 


#3
May1212, 08:33 PM

P: 210

Or as they say: "Mass is a measure of inertia"



#4
May1212, 08:54 PM

P: 329

What are the units for inertia?
If you find it easier to start with a slightly less mathematical definition, mass determines how hard it is change a body's translational motion. Moment of inertia is determines how hard it is to change a body's rotational motion. 


#5
May1212, 09:50 PM

Mentor
P: 15,166




#7
Jul1413, 08:49 AM

P: 1

Second, they have different units: kg vs. kg*m^{2} as rollcast posted. Third, they are different from mass or anything else: Inertia  The tendency of a body to resist acceleration; the tendency of a body at rest to remain at rest or of a body in straight line motion to stay in motion in a straight line unless acted on by an outside force Mass  a collection of incoherent particles, parts, or objects regarded as forming one body Fourth, they are not mass or momentum, it has its own property. Even though the Inertia has the same unit as mass, the concept is different. The Moment of Inertia does not even have the same unit as momentum. 


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