Vertical Friction

var config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    parent: 'phaser-example',
    physics: { default: 'arcade', arcade: { debug: true } },
    scene: {
        preload: preload,
        create: create
    }
};

new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('block', 'assets/sprites/block.png');
    this.load.image('dude', 'assets/sprites/phaser-dude.png');
}

function create ()
{

    // Friction movement is parallel to the movement of the immovable body
    // and perpendicular to the direction of overlap/separation

    var block = this.physics.add.image(400, 200, 'block')
        .setFriction(0, 1)
        .setImmovable(true)
        .setVelocityY(100);

    var sprite = this.physics.add.image(200, 300, 'dude')
        .setGravityX(100)
        .setVelocityX(100);

    this.time.addEvent({
        delay: 2000,
        loop: true,
        callback: function ()
        {
            block.body.velocity.y *= -1;
        }
    });

    this.physics.add.collider(block, sprite);
}
                        

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