Vibrations The Movement of Energy Music. Waves A transfer of energy over a distance in the form of a disturbance Wave originate from objects that are.

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Presentation transcript:

Vibrations The Movement of Energy Music

Waves A transfer of energy over a distance in the form of a disturbance Wave originate from objects that are vibrating

This is cool so why not…

Three Types of Vibrations 1. Transverse Vibrations  Occurs when an object vibrates perpendicular to its axis  ie. Guitar strings

Transverse Waves

2. Longitudinal Vibrations  Occurs when an object vibrates parallel to its axis  Ie. Shocks on a car or mountain bike

Longitudinal Waves

2. Torsional Vibrations  Occurs when an object twists around it’s axis  Ie. Washing machine

 Let’s hit the hallway…

Describing Vibrations Cycle  Occurs with a repeating event  One cycle – when an object returns to the place it started and it is moving in the same direction

Describing Vibrations Rest Position  Midway point between extremes in a cycle

Describing Vibrations Amplitude (A)  Displacement of object to either side of it's rest position

Describing Vibrations Frequency (f)  The number of cycles per second  Measured in Hertz (Hz)

Describing Vibrations 1 Hz = 1 cycle per second

Describing Vibrations Period (T)  The time required for one cycle  Measured in seconds

Formulas f = 1T = 1 T f f = # of cyclesT = Time Time # of cycles

Sample Problem If an electron vibrates back and forth with a frequency of 60 Hz, how long does it take to undergo one cycle?

Comparing Vibrations In Phase Vibrations  Pass the rest point at the same time  Same period of vibration

Comparing Vibrations Out of Phase Vibrations  Different period or same period but do not pass through the rest point at the same time