# Forces Dynamics Worksheet - PDF - PDF by hct19110

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```									PHYS 250                                                Worksheet for Dynamics Problems

1.   Make a sketch of the problem showing all
objects and surfaces involved.

2.   In an area away from your overall sketch,
isolate EACH object in the problem by drawing a
free-body force diagram for the object. This
diagram should show all of the forces acting on
the object (and ONLY forces acting ON the
object). Identify each force with an
appropriate UNIQUE vector symbol.

3.   Select a convenient coordinate system for each
force diagram and indicate the coordinate axes

4.   Write each force in component representation
(either using unit vectors or using column
vectors). Express magnitudes as positive
quantities and use + or - signs to indicate
directions.

5.   Symbolically write the acceleration vector for
each object. Be sure that the components of
the acceleration that are trivially zero are
written as zeros and that the accelerations of
multiple objects are consistent with each other.

5.   If there is more than one object in the problem
identify any possible action-reaction pairs.
These forces will have equal magnitudes and
opposite directions.

6.   Apply Newton's Second Law in vector form to
EACH object.

7.   Resolve the vector equations into component
equations, and solve the resulting algebraic
system of equations for the unknown quantities.

8.   Check the results for appropriateness, correct
units, etc.

```
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