
Pictorial Model
When first solving a problem, our initial concern should not
be with specific numbers and calculations, but with simply understanding the
information in a useful way.
The Pictorial Model is a good way to do this.
A Pictorial Model should include:
 A sketch of the situation, showing each object
 at the beginning of the motion,
 the end of the motion,
 and at any point in between where the character of
the motion changes.
 A coordinate system that you impose on the problem, including
a choice of th origin, the axes, and the positive direction.
 Symbols, on the sketch, to show position, velocity, and
time with subscripts for each time an object is shown on your sketch. Also,
show symbols for other relevant quantities such as mass
 Arrow indicating the direction of the acceleration vector
or vectors. Write
a = 0 if the acceleration is zero.
 A Table listing the values for all quantities given in
the problem or that can be found quickly using geometry.
 A list of the unknown quantities you have been asked to
find.
