///// body construction
		BodyDef bodyDef = new BodyDef();
		// We set our body to dynamic, for something like ground which doesnt move we would set it to StaticBody
		bodyDef.type = BodyType.DynamicBody;
		// Set our body's starting position in the world
		bodyDef.position.set(100, 200);
		
		// Create our body in the world using our body definition
		Body body = world.createBody(bodyDef);

		// Create a circle shape and set its radius to 6
		CircleShape circle = new CircleShape();
		circle.setRadius(20f);

		// Create a fixture definition to apply our shape to
		FixtureDef fixtureDef = new FixtureDef();
		fixtureDef.shape = circle;
		fixtureDef.density = 500f; 
		fixtureDef.friction = 0f;
		fixtureDef.restitution = 1f; 
		
		// Create our fixture and attach it to the body
		fixture = body.createFixture(fixtureDef);

//// apply force on press of keys
        Vector2 impulse = new Vector2();
        impulse.x = ( Gdx.input.isKeyPressed( Input.Keys.LEFT ) ? - 1000
                : ( Gdx.input.isKeyPressed( Input.Keys.RIGHT ) ? 1000 : 0 ) );
        impulse.y = ( Gdx.input.isKeyPressed( Input.Keys.UP ) ? 1000
                : ( Gdx.input.isKeyPressed( Input.Keys.DOWN ) ? - 1000 : 0 ) );

        fixture.getBody().applyLinearImpulse(impulse, fixture.getBody().getWorldCenter());

//// painting using the body pos
	Actor e = (Actor) b.getUserData();
	
	if (e != null) {
		// Update the entities/sprites position and angle
		e.setPosition(b.getPosition().x, b.getPosition().y);
		// We need to convert our angle from radians to degrees
		e.setRotation(MathUtils.radiansToDegrees * b.getAngle());
	}