@ Dragonfist111

It is not the mass you having problem with. is the gravity.

You are using units (quants i beleive) that are too small. Maybe you want hight detail in you model.

You need to increase the value of the gravity of. you can find that constant in the file NewtonScript2.wdl
fine the line
Code:

---

  
define newtonGravity, -550.0;

---

and double the value of -550.0;
keep increasing the value until it feel right to you.

Also don't forget to move the pivot point of your models to the center of the gemmetry. You can do that in the model editor, or any mesh editor you are using.

If you do trose steps the physics will look much more realistic

Newton