M2.2 Vibration, harmonics and Resonance

Which of the following is an example of periodic vibration?

• The movement of a car on a gravel road

• The motion of a pendulum

• The sound of a loudspeaker

• The vibration of an eardrum

What is the main problem when trying to reduce noise?

• Increasing vibration

• Reducing vibration

• Increasing sound waves

• Reducing light waves

What is an example of a device that uses desirable vibration?

• A broken wheel

• A loudspeaker

• A silent fan

• A non-vibrating phone

In forced vibration, what is the frequency of the vibration dependent on?

• The color of the object

• The frequency of the force or motion applied

• The size of the object

• The temperature of the environment

What strongly affects the amplitude of forced vibration?

• The behavior of the mechanical system

• The color of the object

• The time of day

• The weather conditions

What is the characteristic of harmonic frequencies?

• They are unpredictable

• They have constant amplitude

• They change color

• They are silent

What is an example of a system experiencing forced vibration?

• A calm lake

• An aircraft's wheels on a runway

• A silent room

• A stationary car

What is the fundamental frequency?

• The highest frequency of a waveform

• The lowest frequency of a periodic waveform

• The average frequency of a waveform

• The frequency of a harmonic

What is a harmonic?

• A wave with a frequency that is a positive integer multiple of the fundamental frequency

• A wave with a frequency lower than the fundamental frequency

• A wave with a frequency equal to the fundamental frequency

What is resonance?

• The tendency of a system to stop oscillating

• The tendency of a system to oscillate at maximum amplitude at a certain frequency

• The tendency of a system to oscillate at minimum amplitude

• The tendency of a system to oscillate at random frequencies