let bob;

 let angleV = 0;

 let angleA = 0;

 let len;

 let origin;

 let gravity = 1;

​

​

 function setup() {

   createCanvas(500, 400);

   origin = createVector(width/2, 0);

   angle = PI / 4

   bob = createVector();

   bob2 = createVector();

   len = 300;

 }

​

 function draw() {

   background(0);

   let force = gravity * sin(angle) / len;

   angleA = -1 * force;

   angleV += angleA;

   angle += angleV;

   angleV *= 0.999

   bob.x = len * sin(angle) + origin.x;

   bob.y = len * cos(angle) + origin.y;

​

   stroke(255);

   fill(127);

   strokeWeight(8);

   line(origin.x, origin.y, bob.x, bob.y);

   circle(bob.x, bob.y, 64);

​

 }