unity movement, object keeps falling even when key is held down-CodePudding

I'm still new to unity and I'm trying to create controls for a hot air balloon, however even though I'm still holding down the up arrow the object ends up falling after a few seconds and I'm not sure why.

if (Input.GetKey(KeyCode.UpArrow))
        {
           
           transform.position  = new Vector3(0, 1, 0) * Time.deltaTime * speed;
           fuel = fuel - 3 * Time.deltaTime;
           
        }

CodePudding user response：

When you say that the object is "falling" I take that to mean that you've added a Rigidbody (or Rigidbody2D) component to it with gravity enabled.

If you're using a Rigidbody to simulate gravity, you can't just manually manipulate the position like this. You'll want to use Rigidbody.AddForce() instead.