Discussion
Match each term in List I with its meaning in List II.
List I
A. Rigidity in space
B. Precession
C. Toppling
D. Erection
List II
1. The axis staying fixed unless a torque acts
2. Motion at 90 degrees to an applied force
3. The axis tumbling when gimbal limits are exceeded
4. Torquing the axis back towards the vertical
Select the correct match.
Answer: A
Correct answer: A-1, B-2, C-3, D-4
The four terms cover the property, the response, the failure and the correction. Rigidity is the axis staying fixed absent a torque; precession is the motion at 90 degrees when a torque is applied.
Toppling is the axis tumbling when the gimbal limits are exceeded, after which the reference is lost. Erection is the system that torques the axis gently back towards the vertical, correcting drift - and it is the source of the acceleration and turn errors, since it finds the vertical pendulously.
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