Energy, damping and resonance Quiz
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5 questions, one answer each
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1. A mass on a spring oscillates with no damping. At which point is its kinetic energy a maximum?
- A. At maximum displacement
- B. Midway between the equilibrium position and the maximum displacement
- C. At the equilibrium position
- D. Kinetic energy is constant throughout
2. The amplitude of an undamped oscillator is doubled. What happens to its total energy?
- A. It stays the same
- B. It doubles
- C. It increases by a factor of 4
- D. It increases by a factor of 8
3. A system is driven at a frequency equal to its natural frequency. What is this called?
- A. Critical damping
- B. Free oscillation
- C. Resonance
- D. Plastic deformation
4. Which change to a system makes its resonance peak lower and broader?
- A. Increasing the damping
- B. Decreasing the damping
- C. Increasing the driving force frequency only
- D. Removing the driver
5. A bridge deck is driven near its natural frequency by wind. Which feature of the bridge would reduce the amplitude of vibration?
- A. Using a brittle material that cracks when stressed
- B. Reducing the damping to a minimum
- C. Adding dampers, or ductile material that undergoes plastic deformation
- D. Increasing the driving force at the natural frequency