The quantum mechanical operator for one type of this quantity is negative
For one type of this quantity, the commutator of two of its components is given by i times h-bar times the third component. The quantum mechanical operator for one type of this quantity is negative i times h-bar times the gradient. Classically, one type of this quantity equals the cross product of the position vector with the other type of this quantity. Impulse equals the change in one type of this quantity, which is conserved in inelastic collisions. For 10 points, name this quantity that comes in angular and linear types, the latter of which equals mass times velocity.
For one type of this quantity, the commutator of two of its components is given by i times h-bar times the third component.
momentum [accept linear momentum or angular momentum at any point; accept spin before "gradient"]