Newton's second law suggests that impulse is the change in this quantity, or alternately that the time derivative of this quantity is the force.
The density of this quantity in an electromagnetic field is equal to epsilon-nought times mu-nought times the Poynting vector. In Hamiltonian mechanics this quantity is generalized as the derivative of the Lagrangian with respect to the generalized velocity. This quantity is represented by the operator negative i times h-bar times the gradient. The coefficient of restitution measures how well this quantity is conserved in collisons. Newton's second law suggests that impulse is the change in this quantity, or alternately that the time derivative of this quantity is the force. For 10 points, name this physical quantity, equal to mass times velocity.
The density of this quantity in an electromagnetic field is equal to epsilon-nought times mu-nought times the Poynting vector.
linear momentum [do not accept "angular momentum"]