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
     on your diagram(s).

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

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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