The momentum of a body is calculated by multiplying its mass by its what?
Angular momentum can be elements of a continuous distribution, such as a solid body. Rearranging equation () by vector identities, multiplying both terms by "one", and grouping appropriately, gives the total angular momentum of the system of particles in terms of moment of inertia formula_5 and angular velocity formula_124, In the case of a single particle moving about the arbitrary origin, For the case of the center of mass fixed in space with respect to the origin, In modern (20th century) theoretical physics, angular momentum (not including any intrinsic angular momentum – see below) is described using a different formalism, instead of
Angular momentum formula_2 turning moment arm formula_13) with a linear (straight-line equivalent) speed formula_15. Linear speed referred to the central point is simply the product of the distance formula_13 and the angular speed formula_6 versus the point: formula_63 another moment. Hence, angular momentum contains a double moment: formula_64 Simplifying slightly, formula_65 the quantity formula_66 is the particle's moment of inertia, sometimes called the second moment of mass. It is a measure of rotational inertia. Because rotational inertia is a part of angular momentum, it necessarily includes all of the complications of moment of inertia, which is calculated by multiplying elementary bits of