11-19-09 Unannounced Exercise
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List the 3 types of equilibrium.
ð____________________________
stable
ð____________________________
unstable
ð____________________________
neutral
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An object in which type of equilibrium will return to its original
position if displaced.
ð____________________________
stable
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List the 2 conditions for
equilibrium
ð____________________________
Sum of forces about each of the 3 axes
= 0
ð____________________________
Sum of torques about any axis = 0
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Clearly define torque without using an equation.
Product of the component of the applied force that is perpendicular to the
radius times the radius.
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When is the angular momentum of a rotating object conserved?
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_____________________ is concerned with the calculation of forces
acting on and within structures
that are in
equilibrium.
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What is the guidance given in the text for the choice of an axis for
calculating torque?
Any axis perpendicular to the x-y plane that might make
the calculation easier.