This interactive module plots the step response of a second-order dynamical system. The pole locations can be changed by dragging the poles in the complex plane. Also, the denominator polynomial can be changed by entering coefficients separated by commas in the boxes below. For example, to obtain the transfer function $$G(s) = \frac{1}{s^2 + s + 2} $$ enter 1 in the box for the numerator and 1,1,2 in the box for the denominator and click plot (for now only supports second-order systems with no zeros).