(self, frame)
return self.mass * self.masscenter.vel(frame)
Linear momentum of the rigid body.

        The linear momentum L, of a rigid body B, with respect to frame N is
        given by

        L = M * v*

        where M is the mass of the rigid body and v* is the velocity of
        the mass center of B in the frame, N.

        Parameters
        ==========

        frame : ReferenceFrame
            The frame in which linear momentum is desired.

        Examples
        ========

        >>> from sympy.physics.mechanics import Point, ReferenceFrame, outer
        >>> from sympy.physics.mechanics import RigidBody, dynamicsymbols
        >>> M, v = dynamicsymbols('M v')
        >>> N = ReferenceFrame('N')
        >>> P = Point('P')
        >>> P.set_vel(N, v * N.x)
        >>> I = outer (N.x, N.x)
        >>> Inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, N, M, Inertia_tuple)
        >>> B.linear_momentum(N)
        M*v*N.x
Linear momentum of the rigid body.
Linear momentum of the rigid body .
def linear_momentum(self, frame):
        """ Linear momentum of the rigid body.

        The linear momentum L, of a rigid body B, with respect to frame N is
        given by

        L = M * v*

        where M is the mass of the rigid body and v* is the velocity of
        the mass center of B in the frame, N.

        Parameters
        ==========

        frame : ReferenceFrame
            The frame in which linear momentum is desired.

        Examples
        ========

        >>> from sympy.physics.mechanics import Point, ReferenceFrame, outer
        >>> from sympy.physics.mechanics import RigidBody, dynamicsymbols
        >>> M, v = dynamicsymbols('M v')
        >>> N = ReferenceFrame('N')
        >>> P = Point('P')
        >>> P.set_vel(N, v * N.x)
        >>> I = outer (N.x, N.x)
        >>> Inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, N, M, Inertia_tuple)
        >>> B.linear_momentum(N)
        M*v*N.x

        """

        return self.mass * self.masscenter.vel(frame)
def linear_momentum ( self , frame ) : return self . mass * self . masscenter . vel ( frame )