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  • What are the units for inertia? - Physics Forums
    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
  • If Moment of Inertia units are mm^4, how do you use it in calculations?
    1) Double checking my notes the units for the result of Moment of Inertia are [mm^4] Perhaps it's because we're working in 2D, or haven't started calculus yet? 2) So radius of gyration is simply the Inertia divided by the area, and that's the quality you're normally given in a statics equation in order to solve a problem whether something
  • Moment of Inertia vs. Inertia Constant - Physics Forums
    [tex] d) J = \text{moment of inertia for rotor } (kg m^2) [ tex] I e [tex] J = 2HS \omega_0^2 [ tex] can be used to find the moment of inertia Based on the units of a), b) and c) the unit of J is [tex] s MW (rad^2 s^2) [ tex] However, i cannot see that this is the same as kg m^2, as the result is supposed to yield from d) Can anyone help me?
  • How to Convert Moment of Inertia from Slug-ft^2 to N-m^2 - Physics Forums
    Homework Statement I am asked to convert moment of inertia of a spacecraft from slug-ft^2 to N-m^2 Homework Equations The Attempt at a Solution Is this a trick question? Usually moment of inertia is expressed in kg-m^2 not N-m^2 1 slug = 1 lbf-s^2 ft --> therefore 1
  • Units of Inertia and Moment of Inertia - Physics Forums
    Yes, moment does refer to the distance from the quantity to the reference point (or the perpendicular distance to the reference axis) I call this distance the moment arm You have to multiply the quantity in question by the moment arm in order to get the moment (It's a cross product but ordinary algebraic multiplication works in simple cases )
  • Units for moment of inertia of a circle - Physics Forums
    Circle Inertia Moment Moment of inertia Units Apr 21, 2011 #1 Femme_physics Gold Member 2,548 1 We've
  • How is moment of inertia calculated and translated between units?
    Calculating moment of inertia and translating it between units, I've become confused The example is a mass of 1kg at 2000mm from the pivot The force is applied at 1000mm from the pivot Basics as far as I'm aware: Moment of inertia = mass * Distance to center of rotation^2 Torque = Moment of inertia * angular acceleration
  • Static moment VS Moment of inertia - whats the difference?
    Good catch there I just assumed the OP was talking about statics and usually you don't deal mass moment of inertia as much as the area moment of inertia in statics Just wanted to interject that all my engineering professors hated the term "area moment of inertia" because it has little, if anything, to do with the concept of inertial mass
  • Elastic Section Modulus vs Moment of Inertia - Physics Forums
    For bodies in rotational motion, the corresponding equation is T = J α, where J is the mass moment of inertia of the body (and which has units of ML2) and α is the angular acceleration (units of radians per second2) produced by the applied torque T (units of force times distance, or M × L × T-2 × L = ML2T-2)
  • Inertia: Why Is It Measured in Meters to the Fourth Power? - Physics Forums
    You are doing the same operation that you are doing for the "classical inertia moment", mass x distance^2 (Kg m^2), but instead of the mass you are using the area the logical explanation is that when you are calculating a some sort of geometrical moments you are, always, multiplying a quantity x distance^2





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