Hello, im new here. Liking the engine.
I have a Rigidbody with collider and model children
When i use apply force i need to input a MASSIVE value like: 500000 for my cube to jump
Any ideas? Thank you all. Btw im still reading the docs and all so sorry if this q has been asked or something.
Flax uses centimeter units.
500,000 applied as an impulse will feel similar to 35,000 applied as a one shot acceleration.
World Units | Flax Documentation (flaxengine.com)
note the value of [Simulation Options: gravity] on this page
Physics Settings | Flax Documentation (flaxengine.com)
Your days in meter world are over unless you force it. 
Welcome to Flax.
Hey Mark, thank you for your answer Im loving the engine so far