Why can't Animation run functions with Rigidbody.AddForce?

Hello,

I'm trying to use Animation Component to call certain functions in my script.

I know that the function is being ran because it shows up being called on the Console if i put print("ran"), but for some reason the Rigidbody AddForce code isn't running.

 function Jump(){
        rigidbody.AddForce(Vector3.up*10, ForceMode.Impulse);
     print("jump called");
     jumping = true;    
 }

Even if I insert this into the FixedUpdate() function it doesn't work, when I go to the editor and checkmark jumpNow variable to true...

 function FixedUpdate ()
 {
         if(jumpNow == true){
         Jump();
             }
 }

Any enlightenment on this subject would be most helpful, I'm pretty sure I'm missing something basic or doing something a bit incorrectly.

Thank you!