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10 Terms
1
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A particle is in equilibrium in an inertial frame of reference if the vector sum of all the forces acting on the particle is __________.
zero.
2
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For an extended object to have zero acceleration, the vector sum of all __________ acting on the object must be zero.
external forces
3
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The first condition for equilibrium states that the net external force on an object at rest must be __________.
zero.
4
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The second condition for equilibrium requires that the sum of external __________ must be zero about any point for an object in equilibrium.
torques
5
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A rigid body not rotating around a certain point has __________ angular momentum about that point.
zero
6
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For an object to remain nonrotating, the net external torque around any point must be __________.
zero.
7
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The first condition for equilibrium relates to the __________ of an object remaining at rest.
center of mass
8
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It is often called the __________ condition for equilibrium that the net external force must be zero.
first
9
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The __________ condition for equilibrium relates to the object's tendency to rotate.
second
10
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According to the second condition for equilibrium, the rate of change of angular momentum must be __________.
zero.