Physics Principles and Problems 2009

Section 8.2 : Rotational Dynamics

Self-Check Quizzes

1
_____ is a measure of how affectively a force causes rotation.
A)Acceleration
B)Friction
C)Moment of inertia
D)Torque
2
The resistance to rotation is called _____.
  Need a Hint?
A)friction
B)moment of resistance
C)moment of inertia
D)torque
3
The _____ is the perpendicular distance from the axis of rotation to the point where the force is exerted.
A)hinge
B)lever arm
C)pivot point
D)rotational axis
4
Why does applying a forces in the picture at the top left result in no effect?

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A)The force is applied parallel to the lever arm.
B)The force is applied perpendicular to the lever arm.
C)The force is applied perpendicular to the axis of rotation.
D)The force is applied at the axis of rotation.
5
If the door is 0.90 m wide and you exert a force of 2.0 N as in the picture on the top right, what is the magnitude of the resulting torque on the door?

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A)0.40 N·m
B)0.45 N·m
C)1.8 N·m
D)2.9 N·m
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