Respuesta :
The notation that are commonly used on force diagrams to show forces acting on an object are put marked, check image.
These are force is z-direction,
Force due to gravity,
Frictional force.
These are force is z-direction,
Force due to gravity,
Frictional force.

Answer : The forces used in force diagrams are [tex]F_z[/tex], [tex]F_f[/tex] and [tex]F_g[/tex].
Explanation :
The push or the pull applied on an object is called force. It is denoted by F. There are some notation for the different types of forces.
[tex]F_z[/tex] is the force acting in z- direction.
[tex]F_f[/tex] is the frictional forces. It is the opposing force. It opposes the motion of an object.
[tex]F_g[/tex] is the gravitational force.
So, the correct options are [tex]F_z[/tex], [tex]F_f[/tex] and [tex]F_g[/tex]