def evaluateRforces(Pot,R,z,phi=None,t=0.,v=None):
    """
    NAME:

       evaluateRforce

    PURPOSE:

       convenience function to evaluate a possible sum of potentials

    INPUT:

       Pot - a potential or list of potentials

       R - cylindrical Galactocentric distance (can be Quantity)

       z - distance above the plane (can be Quantity)

       phi - azimuth (optional; can be Quantity))

       t - time (optional; can be Quantity)

       v - current velocity in cylindrical coordinates (optional, but required when including dissipative forces; can be a Quantity)

    OUTPUT:

       F_R(R,z,phi,t)

    HISTORY:

       2010-04-16 - Written - Bovy (NYU)

       2018-03-16 - Added velocity input for dissipative forces - Bovy (UofT)

    """
    return _evaluateRforces(Pot,R,z,phi=phi,t=t,v=v)