Vibrations, Waves and Sound. Unit 7: Vibrations, Waves & Sound Chapter 18: Harmonic Motion. 18.1 Harmonic Motion 18.2 Graphs of Harmonic Motion 18.3 Properties of Oscillators. Key Question: How do we describe the back-and-forth motion of a pendulum?.
Vibrations, Waves and Sound
How do we describe the back-and-forth motion of a pendulum?
The period of an oscillator is 15 minutes.
What is the frequency of this oscillator in hertz?
and formula: ƒ = 1/T.
15 min x 60 s = 900 s ƒ = 1 cycle = 0.0011 Hz
1 min 900 s
How do we make graphs of harmonic motion?
What kinds of systems oscillate?
The John Hancock Tower is one of the tallest skyscrapers in New England.
While this skyscraper was being built in 1972 and 1973, a disaster struck— windowpanes started falling out all over the building and crashing to the ground.