% Spring Pendulum Dynamic System Parameters 2020  K. Craig

m = 1.815;             % m = attached mass (kg); m_spring = 0.1445 kg
g = 9.81;              % acceleration due to gravity (m/s^2)                   
k = 172.8;             % spring constant = 172.8 N/m  
Ft = 5.71;             % actual pre-tension in spring = 5.71 N
L = 0.333;             % L = unstretched spring length
                       % pivot point to centroid of mass = (0.065 + 0.175 + 0.093) = 0.333 m
theta_0 = 0.021;       % theta IC (rad)
r_0 = 0.115;           % r IC (m)