arcade physics/global pause

 
var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, update: update, render: render });

function preload() {

    game.load.image('car', 'assets/sprites/car90.png');
    game.load.image('baddie', 'assets/sprites/space-baddie.png');

}

var car;
var aliens;
var cursors;
var spaceKey;

function create() {

    game.physics.startSystem(Phaser.Physics.ARCADE);

    aliens = game.add.group();
    aliens.enableBody = true;

    for (var i = 0; i < 50; i++)
    {
        var s = aliens.create(game.world.randomX, game.world.randomY, 'baddie');
        s.name = 'alien' + s;
        s.body.collideWorldBounds = true;
        s.body.bounce.setTo(0.8, 0.8);
        s.body.velocity.setTo(10 + Math.random() * 40, 10 + Math.random() * 40);
    }

    car = game.add.sprite(400, 300, 'car');
    car.name = 'car';
    car.anchor.set(0.5);

    game.physics.enable(car, Phaser.Physics.ARCADE);

    car.body.collideWorldBounds = true;
    car.body.bounce.set(0.8);
    car.body.allowRotation = true;
    car.body.immovable = true;

    cursors = game.input.keyboard.createCursorKeys();

    spaceKey = this.input.keyboard.addKey(Phaser.Keyboard.SPACEBAR);
    spaceKey.onDown.add(togglePause, this);

}

function togglePause() {

    game.physics.arcade.isPaused = (game.physics.arcade.isPaused) ? false : true;

}

function update() {

    game.physics.arcade.collide(car, aliens);

    car.body.velocity.x = 0;
    car.body.velocity.y = 0;
    car.body.angularVelocity = 0;

    if (cursors.left.isDown)
    {
        car.body.angularVelocity = -200;
    }
    else if (cursors.right.isDown)
    {
        car.body.angularVelocity = 200;
    }

    if (cursors.up.isDown)
    {
        car.body.velocity.copyFrom(game.physics.arcade.velocityFromAngle(car.angle, 300));
    }

}

function render() {
}