# Physics on object created? setVelocity issue?

**URL:** <https://phaser.discourse.group/t/physics-on-object-created-setvelocity-issue/10664>\
**Category:** Phaser 3\
**Created:** [November 16, 2021, 12:39am UTC](https://phaser.discourse.group/t/physics-on-object-created-setvelocity-issue/10664 "2021-11-16T00:39:07Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![DonP](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/donp/32/5913_2.png) [@DonP](https://phaser.discourse.group/u/DonP)\
**Post date:** [November 16, 2021, 12:39am UTC](https://phaser.discourse.group/t/physics-on-object-created-setvelocity-issue/10664/1 "2021-11-16T00:39:07Z")

</div>

Hi, I am creating an object in my main game scene, the object is a player and i want it to use the setVelocityX() function, but I have error saying cannot read properties of undefined (reading ‘setVelocityX’) so I am thinking maybe the object does not have physics and thats why the error. But i can not find how to give the player object physics. I do user this.physics.add.sprite to create the player, so i thought this would add physics.

```javascript
class Game extends Phaser.Scene
{

    constructor ()
    {
        super({"game"});
        let aKey;
        let dKey;
        let inputKey;
    }

    create()
    {
        this.inputKey = this.input.keyboard.createCursorKeys(); 
        this.add.image(400, 300, 'background');  
        player1 = this.createPlayer(200, 500, 'player1', player1);
        player2 = this.createPlayer(600, 500, 'player2', player2);
         
        
    };

 createPlayer(x, y, key, player)
    {
        player = this.physics.add.sprite(x, y, key);
        player.health = 100;
        player.setCollideWorldBounds(true); 

        this.aKey = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.A);    
        this.dKey = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.D);

}
 update()
    {

        if(this.aKey.isDown || this.dKey.isDown)
        {
            this.movePlayer();
        }
}

  movePlayer()
    {
        if(this.aKey.isDown)
        {
            player1.setVelocityX(-100);
        }
        else
        if(this.aKey.isDown)
        {
            this.player1.setVelocityX(100);
        }
    }

```

---

<div class="post-metadata">

**Author:** ![samme](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/samme/32/5275_2.png) [@samme](https://phaser.discourse.group/u/samme)\
**Post date:** [November 16, 2021, 4:12pm UTC](https://phaser.discourse.group/t/physics-on-object-created-setvelocity-issue/10664/2 "2021-11-16T16:12:06Z")

</div>

You need to use

```javascript
this.player1 = this.createPlayer(200, 500, 'player1', this.player1);
this.player2 = this.createPlayer(600, 500, 'player2', this.player2);

```