Basic Gravity

var game = new Phaser.Game(1000, 563, Phaser.CANVAS, 'phaser-example', { preload: preload, create: createGame, update: update });

function preload()
{
    game.load.image('playerImage', 'img/player.png', 48, 48);
}

var player;

function createGame()
{
    game.physics.startSystem(Phaser.Physics.ARCADE);
    player = game.add.sprite(400, 400, 'playerImage');
    game.physics.arcade.enable(player, Phaser.Physics.ARCADE);
    game.physics.arcade.enable(player, Phaser.Physics.ARCADE);
    game.physics.arcade.gravity.y = 250;
}

function update()
{
    game.world.removeAll();
    game.add.sprite(player.x, player.y, 'playerImage');
}