M2.2 Vibration, harmonics and Resonance

What is the main problem when trying to reduce noise?

• Increasing vibration

• Reducing vibration

• Increasing sound waves

• Reducing light waves

What is the characteristic of harmonic frequencies?

• They are unpredictable

• They have constant amplitude

• They change color

• They are silent

What is the first harmonic also known as?

• Second overtone

• Fundamental frequency

• Third harmonic

• Fourth harmonic

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

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 happens when a swing is pushed at its natural frequency?

• It stops moving

• It moves at a constant speed

• It will be in resonance and oscillate with maximum amplitude

• It moves slower

What happens to the amplitude of a wave as it travels through a medium with high damping?

• The amplitude increases

• The amplitude becomes infinite

• The amplitude decreases

• The amplitude remains constant

What is the primary characteristic of a damped oscillation?

• Random amplitude changes

• Decreasing amplitude over time

• Increasing amplitude over time

• Constant amplitude over time

Which of the following is an example of a non-periodic vibration?

• The vibration of a car engine

• The ticking of a clock

• The swinging of a pendulum

• The sound of a tuning fork