FTP identify this physical quantity, a measure of the difficulty in rotating an object; the rotational analogue of mass.
This quantity is actually a tensor, but when the axis of rotation is known, the more common scalar  quantity can be formed using the dot product. When multiplied by the angular acceleration, it yields the net torque on an object. When ice skaters pull in their arms, they are reducing this quantity in order to increase their angular speed by the conservation of angular momentum. For an ideal particle, it is equal to the mass times the square of its distance from the axis of rotation. FTP identify this physical quantity, a measure of the difficulty in rotating an object; the rotational analogue of mass.
This quantity is actually a tensor, but when the axis of rotation is known, the more common scalar  quantity can be formed using the dot product.
moment of inertia (or rotational inertia; prompt on “I”)