Trying to create glide effect

I’m trying to create a gliding effect with my character when the ctrl button is pressed (and jumping), but so far I’m having no success

My current attempt is this:

function Update() {
        if (Input.GetButton ("Fire1")) {   
        rigidbody.AddForce (0,10,0);

I did try manipulating gravity and while it did work it heavily affected the actual jump, which looked unrealistic. I think adding an upward force would look more realistic and cause less problems

If anyone could help me out this would be really appreciated

I’m not sure but i think you should check this AddRelativeForce