We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
An italic capital I or J, resistance to angular acceleration.
Also known as: Moment of inertia, Rotational inertia, Second moment of mass
The moment of inertia is how hard something is to spin up, and it depends on the axis chosen — the same object has different values about different axes. It collides with electric current, also I, which is why some texts use J instead.
Denotes the moment of inertia of a body about a specified axis.
Contexts: Laboratory
Is defined only relative to an axis; the parallel-axis theorem relates values about different axes.
Contexts: Laboratory
Collides directly with electric current, also an italic capital I, which is why J is used in electrical engineering contexts.
Contexts: Laboratory
An italic capital letter I, a single vertical stroke, or a capital J with a hooked foot.