Gravity

class Example extends Phaser.Scene
{
    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.image('block', 'assets/sprites/block.png');
    }

    create ()
    {
        const group = this.physics.add.group({
            defaultKey: 'block',
            bounceX: 1,
            bounceY: 1,
            collideWorldBounds: true
        });

        // World gravity
        this.physics.world.gravity.y = 150;

        // Total gravity is 150.
        group.create(250, 300);

        // Total gravity is 450.
        group.create(350, 300).setGravity(0, 300);

        // Total gravity is 150.
        group.create(450, 300).setGravity(0, -300);

        // No gravity.
        group.create(550, 300, 'block').body.setAllowGravity(false);
    }
}

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

const game = new Phaser.Game(config);