Explanation :
The free body diagram shows all the forces acting on an object. It simplifies the problem of mechanics.
In this case, the forces acting on Julie are normal force i.e. [tex]F_N[/tex] and gravitational force i.e. [tex]F_g[/tex]
As both the normal force and the gravitational force oppose each other i.e. the forces are balanced. So, the net force acting on her is equal to zero i.e.
[tex]F_{net}=0[/tex]
Hence, the net force acting on Julie is 0 N.
