An ideal pendulum is often discussed when studying simple harmonic motion. What are the conditions needed for an ideal pendulum? check all that apply. Gravitational force acts to pull the pendulum’s mass down. The mass of the rod of the pendulum is evenly distributed along the rod. The pivot on which the pendulum swings is frictionless. The pendulum swings through its equilibrium position as a result of inertia. Tension acts downward on the pendulum’s mass.