The Noether charge of translational invariance, its derivative is equal to mass times acceleration, or force.
This quantity's namesake quantum mechanical operator is equal to negative I times Dirac's constant times the gradient operator.  Taking the Fourier transform of that operator yields the conjugate position operator, and it is equal to Planck's constant over the wavelength. The Noether charge of translational invariance, its derivative is equal to mass times acceleration, or force. Always conserved in a closed system, for 10 points, name this quantity, usually defined as equal to mass times velocity.
This quantity's namesake quantum mechanical operator is equal to negative I times Dirac's constant times the gradient operator.  
Momentum