Applying Force in Nodes Facing Direction

I have a car model in ARKit application and I am able to rotate the car but now I want to apply force to the car so it can move in the direction it is facing.

Here is my code. the accelerate method is the one that I need to see what I can do with moving the car.

enum BodyType : Int {
    case car = 1
    case ground = 2
}
class Car :SCNNode {
  
    var carNode :SCNNode
  
    init(node: SCNNode) {
      
        self.carNode = node
        super.init()
      
        setup()
    }
  
    private func setup() {
      
        self.addChildNode(self.carNode)
      
        /
        self.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)
        self.physicsBody?.categoryBitMask = BodyType.car.rawValue
    }
  
    func accelerate() {
      
            /
    }
  
    func turnRight() {
      
        self.physicsBody?.applyTorque(SCNVector4(0,1.0,0,-0.1), asImpulse: true)
    }
  
    func turnLeft() {
      
        self.physicsBody?.applyTorque(SCNVector4(0,1.0,0,0.1), asImpulse: true)

    }

Any ideas?