Drawing FBDs for Ramps • Choose the object of interest and draw it as a dot or box • Draw and label all the external forces acting on the object • Sketch a coordinate system, choosing the direction of the object’s motion as one of the positive axes Pseudo-FBDs • When forces don’t line up with axes, you can draw a pseudo-FBD • Break forces that don’t line up with axes into components that do • Redraw your diagram with all forces parallel to axes
