Satellite.js

class Satellite extends Planet {
  constructor(position, mass, radius, color, vel) {
    //Telling Planet to build a base planet for us
    super(position, mass, radius, color);
    //Redefining the velocity to be something we pass it (shadowing)
    this.velocity = vel;
    //Our new variable acceleration
    this.acceleration = createVector(0, 0);
  }
  
  //An apply force function - check the physics section to understand this
  applyForce(force) {
    var f = p5.Vector.div(force, this.mass);
    this.acceleration.add(f);
  }
  
  //And an update function
  update() {
    this.velocity.add(this.acceleration)
    this.position.add(this.velocity);
    this.acceleration.mult(0);
  }
}