Tractor Trailer Physics

Phaser 3
1

I have been trying to make a trailer parking game for long. After a long time I have just built the first goal that steering works!. But I don’t know how to make formula for trailer?

I made function for steering with that:

if (cursors.up.isDown)
{


    this.__araba.body.angularVelocity = this.normal(this.__wheel.angle)
    

    this.physics.velocityFromAngle(this.__araba.angle-90, 300, this.__araba.body.velocity)

   // this.__araba.body.angularVelocity = -10
}
else if (cursors.down.isDown)
{
    this.__araba.body.angularVelocity = this.normal(-this.__wheel.angle)

    this.physics.velocityFromAngle(this.__araba.angle-90-180, 300, this.__araba.body.velocity)
}

for normalization function:

    this.normal = (angle) => {
        if (angle === 0){
            return 0;
        }
        else if (angle > 0){
            return angle/90*100;
        }
        else if (angle < 0){
            return angle/90*100
        }
    }

but. i don’t know how to make traile physics function.
demo link: https://html5.ozguruygulama.com/romork/dist/index.html