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Name 1. Two identical metal balls are suspended by insulating threads. Both balls have the same net charge. In this problem, do not assume the balls are point charges. a. Draw a separate free-body diagram for each ball. Label the forces to indicate: • the object exerting the force, • the object on which the force is exerted, • the type of force (gravitational, normal, etc.), and • whether the force is a contact or a non- contact force. b. Suppose the charge on the second ball is reduced slightly, so that it is less than that on the first ball. Predict whether the angle that ball 1 makes with the vertical will be greater than, less than, or equal to the angle that ball 2 makes with the vertical. Explain. Sketch your answer above. How does the free-body diagram for each ball in this case compare to the corresponding free- body diagram that you drew in part a? If the magnitudes or directions of any of the forces change, describe how they change. c. Predict what will happen if the net charge on ball 2 is reduced to zero. Make a sketch to illustrate your answer. Tutorials in Introductory Physics McDermott, Shaffer, & P.E.G., U. Wash. OPrentice Hall, Inc. First Edition, 2002

          Name
1. Two identical metal balls are
suspended by insulating
threads. Both balls have the
same net charge. In this
problem, do not assume the
balls are point charges.
a. Draw a separate free-body
diagram for each ball.
Label the forces to
indicate:
• the object exerting the force,
• the object on which the force is exerted,
• the type of force (gravitational, normal,
etc.), and
• whether the force is a contact or a non-
contact force.
b. Suppose the charge on the
second ball is reduced
slightly, so that it is less
than that on the first ball.
Predict whether the angle
that ball 1 makes with the
vertical will be greater
than, less than, or equal to
the angle that ball 2 makes
with the vertical. Explain.
Sketch your answer above.
How does the free-body diagram for each ball in this case compare to the corresponding free-
body diagram that you drew in part a? If the magnitudes or directions of any of the forces
change, describe how they change.
c. Predict what will happen if
the net charge on ball 2 is
reduced to zero. Make a
sketch to illustrate your
answer.
Tutorials in Introductory Physics
McDermott, Shaffer, & P.E.G., U. Wash.
OPrentice Hall, Inc.
First Edition, 2002

Name
1. Two identical metal balls are
suspended by insulating
threads. Both balls have the
same net charge. In this
problem, do not assume the
balls are point charges.
a. Draw a separate free-body
diagram for each ball.
Label the forces to
indicate:
• the object exerting the force,
• the object on which the force is exerted,
• the type of force (gravitational, normal,
etc.), and
• whether the force is a contact or a non-
contact force.
b. Suppose the charge on the
second ball is reduced
slightly, so that it is less
than that on the first ball.
Predict whether the angle
that ball 1 makes with the
vertical will be greater
than, less than, or equal to
the angle that ball 2 makes
with the vertical. Explain.
Sketch your answer above.
How does the free-body diagram for each ball in this case compare to the corresponding free-
body diagram that you drew in part a? If the magnitudes or directions of any of the forces
change, describe how they change.
c. Predict what will happen if
the net charge on ball 2 is
reduced to zero. Make a
sketch to illustrate your
answer.
Tutorials in Introductory Physics
McDermott, Shaffer, P.E.G., U. Wash.
OPrentice Hall, Inc.
First Edition, 2002

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