Free body diagrams

W

Gravity, pointing down, is there gravity?

Fa

Applied force Way its pushed, pulled, is there a force applied by another object?

Fn

Normal force Up 90° out of surface, is it touching a surface?

Fk

Force kinetic, opposite direction of motion on surface, only it we have it), is it moving a surface

Force static

Opposite potential slide on surface, does it need static friction to not slide