createCanvas(400, 400);

  m=2

  l=2.705

  g=9.814

  dt=0.02

  t=0

  theta = 3.14/10; // Pendulum initial angle theta

  omega = 0; // Initial angular velocity

  C = 2; // Center point

}

​

function draw() {

  background(220);

  // physics

  t = t + dt;

  F=-m*g*sin(theta)

  epsilon = (F/m)/l; //angular acceleration

  omega = omega + epsilon * dt;

  theta = theta + omega * dt;

  xp = C - l * sin(theta); // X coordinate of pendulum ball

  yp = l * cos(theta); // Y coordinate of pendulum ball

  //draw it

  ppm=100 //scale it to the canvas (from meters to pixels)

  line(C*ppm, 0, xp*ppm, yp*ppm);

  ellipse(xp*ppm, yp*ppm, 20, 20);

}