Spin is projected onto this vector to find helicity [heh-LIH-sih-tee].
Spin is projected onto this vector to find helicity [heh-LIH-sih-tee]. This quantity is equal to the derivative of a Lagrangian [luh-GRAHN-jee-un] with respect to velocity. Squaring this quantity and dividing by twice the mass gives kinetic energy. Newton's 2nd Law can be expressed by setting the derivative of this quantity with respect to time for constant mass systems equal to net force. The change in this quantity is equal to the impulse, and this quantity is conserved even in inelastic collisions. Name this quantity equal to mass times velocity.
Spin is projected onto this vector to find helicity [heh-LIH-sih-tee].
(linear) momentum