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?.
How do we describe the back-and-forth motion of a pendulum?18.1 Investigation: Harmonic Motion and the 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?18.2 Investigation: Harmonic Motion Graphs
What kinds of systems oscillate?18.3 Investigation: Natural Frequency
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.Skyscrapers and Harmonic Motion