I am very impressed with Sherwood's force naming suggestion. It emphasized
physics rather than vocabulary and is more intuitive.
Alex. F. Burr
In a message dated 12/9/2013 6:38:49 P.M. Mountain Standard Time,
Bruce_Sherwood@ncsu.edu writes:
Nice exercises!
One of the instructions is "Only include in your diagrams FORCES that you
have learned about this year, such as tensions, normal forces, friction,
and weight."
Having chosen an inertial reference frame, you might consider asking that
students identify the object in the surroundings that is responsible for
the force.