Answer:
When Jill is pushing a box across a floor, it represents the upward motion and it is natural force is applied.
So it is represented as FN and normal force takes place in considering the force perpendicular to the floor.
It seems to support that forced applied on an object when the object is in contact with other.
Explanation:
 
        
             
        
        
        
1. A basketball was thrown in the air and falls to the ground
        
                    
             
        
        
        
That could be a comet, or any one of the billions of meteoroids
moving in a cloud that's actually the remains of a shattered comet.
        
                    
             
        
        
        
I bet she does just give her tule work on yourself
        
                    
             
        
        
        
Decibel - the decibel is a relative unit of measurement equal to one 10th of a bel