ForceMode2D.Force not working in fixed update

Questions & Answers
1

i am making a 2d rocket type game and i am trying to use rigidbody2d.AddForce with forcemode2d to propel the object

public Rigidbody2D rig;
public float jumpHeight;  // set in inspector to 5f

public bool applyForce;

// Update is called once per frame

//checks for input if you are holding down on 'w'
void Update ()
{
    if (Input.GetKey("w"))
    {
        applyForce = true;
    }
    else
    {
        applyForce = false;
    }
}

private void FixedUpdate ()
{
    Ignition();
}

// the function which calls on addforce
public void Ignition ()
{
    if (applyForce)
        rig.AddForce(new Vector2(0, jumpHeight), ForceMode2D.Force);
}

i tried by calling “Ignition()” in Update and it worked fine, and i tried it in fixed Update and nothing happens, no errors or movement. i tried to run ForceMode2D.Impulse instead of ForceMode2D.Force in fixed update and that worked but i need to use it as a force not impulse anyone know how?

unrelated to the question but if you also know how to change a rigidbodies mass in the script that would help me. also if you know how to change gravities value in physics that would help. Thanks in advance!

2

If you have a high end pc or your game uses little resources, you could be running the game at a really high frame rate, so at the end be applying much higher forces in Update than in fixedupdate, try increasing the forces value