Practice Absolute Vs Relative Motion (6.7) - Equations of Motion of SDOF System for Mass as well as Base Excitation

Practice: Absolute vs Relative Motion

Lesson 6.7Equations of Motion of SDOF System for Mass as well as Base Excitation

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8 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the formula for absolute motion?
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Think about how both the mass and the ground contribute to motion.
Question 2.
Define relative motion in structural dynamics.
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Consider what happens to a structure during earthquakes.
3Question 3.
What does absolute motion indicate?
- Only relative displacement
- Total displacement including ground motion
- Only ground motion
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Think about why both factors are essential.
4Question 4.
True or False: Engineers primarily focus on absolute motion when designing structures.
- True
- False
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Focus on what is critical during seismic events.
Question 5.
A structure experiences a ground motion of 0.5 m upward during an earthquake, and a mass within the structure moves 0.6 m upward. Calculate the absolute displacement of the mass.
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Always remember to add the movements to find the absolute displacement.
Question 6.
If a mass experiences a relative acceleration of 4 m/s² while the ground has an acceleration of 2 m/s², what is the absolute acceleration of the mass?
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Combine the effects of both the mass and ground acceleration for total understanding.

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