unity - rigidbody arrow control by Keyboard

The value will be in the range -1...1 for keyboard and joystick input.

        horizontalMovement = Input.GetAxis("Horizontal") * Vector3.right * movementSpeed;
        verticalMovement = Input.GetAxis("Vertical") * Vector3.forward * movementSpeed;

        Vector3 movement = horizontalMovement + verticalMovement;

        rigidbody.AddForce(movement, ForceMode.Force);