The harmonic oscillation of a body of mass m can be compared to the motion of a point on a circle whose radius coincides with the amplitude of oscillations A of the body, and whose angular velocity coincides with the frequency ω. The x-coordinate of this point coincides with the coordinate of the body, and the y-coordinate multiplied by mω coincides with the momentum of the body p. The curves describing the motion of the body in the variables p, x are called a phase portrait. Construct a phase portrait for the pendulum of problem 3.5.1