let angle_vel = 0;

let angle_acc = 0;

let slider;

function setup() { 

  createCanvas(400, 400);

  slider = createSlider(-0.01,0.01,0,0.001);

} 

​

function draw() { 

  background(220);

  translate(200, 200);

  rotate(angle_pos);

  ellipse(0, 0, 200);

  line(0,0,100,0);

  angle_acc = slider.value();

  angle_pos += angle_vel;

  angle_vel += angle_acc;

}