Good Vibrations Slow Motion: https://youtu.be/W4s2UwKm7dc

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Presentation transcript:

Good Vibrations Slow Motion: https://youtu.be/W4s2UwKm7dc Pendulum Waves: https://youtu.be/yVkdfJ9PkRQ

Pendulum and Slinky™

2. What are some ways we could quantify the motion of the pendulum 2. What are some ways we could quantify the motion of the pendulum? (Motion involves distance and time.)

2. What are some ways we could quantify the motion of the pendulum 2. What are some ways we could quantify the motion of the pendulum? (Motion involves distance and time.) The amount of time it takes to complete one cycle is called the period. Period = T

2. What are some ways we could quantify the motion of the pendulum 2. What are some ways we could quantify the motion of the pendulum? (Motion involves distance and time.) The amount of time it takes to complete one cycle is called the period. The number of cycles the pendulum completes in one second is called the frequency. Period = T Frequency = f

Frequency is measured in cycles per second, or Hertz (Hz). Period is measured in seconds (s). The amount of time it takes to complete one cycle is called the period. The number of cycles the pendulum completes in one second is called the frequency. Period = T Frequency = f

Period and frequency are inverses of each other Period and frequency are inverses of each other. In equation form, that is: Frequency is measured in cycles per second, or Hertz (Hz). Period is measured in seconds (s). OR The amount of time it takes to complete one cycle is called the period. The number of cycles the pendulum completes in one second is called the frequency. Period = T Frequency = f

Question 10: How are period and frequency affected by the amplitude of the wave? The amplitude of a pendulum is the maximum displacement from equilibrium. Does the amplitude affect the frequency and period of the movement?

Question 10: How are period and frequency affected by the amplitude of the wave? The amplitude of a pendulum is the maximum displacement from equilibrium. Does the amplitude affect the frequency and period of the movement? The period and frequency do not depend on the amplitude. You can have any amount of frequency or period regardless of what the amplitude is.

What is a wave?

What is a wave? A wave is a disturbance that travels through some medium and carries some kind of information or energy.

Two Types of Disturbances Transverse Wave Disturbance Longitudinal Wave Disturbance Transverse waves carry energy when the parts of the wave move away from equilibrium in a direction perpendicular to the motion of the wave. An example of a transverse wave is an electromagnetic wave (light). Longitudinal waves carry energy when the parts of the wave move away from equilibrium in a direction parallel to the motion of the wave. An example of a longitudinal wave is a sound wave. http://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

Waves Transfer Energy, Not Matter When energy is transferred by a wave from a vibrating source to a distant receiver, no matter is transferred between the two points. The disturbance moves through the medium. World Record: https://youtu.be/H0K2dvB-7WY Thailand Marines: https://youtu.be/A_C-zFGN8YQ

Parts of a Wave

The distance between two repeated points. Parts of a Wave Wavelength (λ) The distance between two repeated points.

The distance between two repeated points. Parts of a Wave Wavelength (λ) The distance between two repeated points. Amplitude The maximum amount of displacement of a particle of the medium from its equilibrium position.

Parts of a Wave Wavelength (λ) The distance between two repeated points. Crest The maximum amount of positive / upward displacement from equilibrium. Amplitude The maximum amount of displacement of a particle of the medium from its equilibrium position.

Parts of a Wave Wavelength (λ) The distance between two repeated points. Crest The maximum amount of positive / upward displacement from equilibrium. Amplitude The maximum amount of displacement of a particle of the medium from its equilibrium position. Trough The maximum amount of negative / downward displacement from equilibrium.

Wave Speed The wave speed describes how quickly the wave disturbance moves through a medium (i.e., a material). The speed of a wave depends only on the medium through which the wave moves, not on the frequency of the wave. A sound wave always travels the same speed through water, but travels even faster through a solid.

Wave Speed The wave speed describes how quickly the wave disturbance moves through a medium (i.e., a material). The speed of a wave depends only on the medium through which the wave moves, not on the frequency of the wave. Speed is equal to the distance travelled divided by the time it takes to travel the distance. As an example, let’s say the distance traveled is the wavelength of a wave. By definition, the time to complete one wavelength is known as the period, so the equation becomes:

Wave Speed The wave speed describes how quickly the wave disturbance moves through a medium (i.e., a material). The speed of a wave depends only on the medium through which the wave moves, not on the frequency of the wave. Speed is equal to the distance travelled divided by the time it takes to travel the distance. As an example, let’s say the distance traveled is the wavelength of a wave. By definition, the time to complete one wavelength is known as the period, so the equation becomes:

Wave Speed The wave speed describes how quickly the wave disturbance moves through a medium (i.e., a material). The speed of a wave depends only on the medium through which the wave moves, not on the frequency of the wave. Speed is equal to the distance travelled divided by the time it takes to travel the distance. As an example, let’s say the distance traveled is the wavelength of a wave. By definition, the time to complete one wavelength is known as the period, so the equation becomes:

25.4 Wave Speed think! If a water wave vibrates up and down two times each second and the distance between wave crests is 1.5 m, what is the frequency of the wave? What is its wavelength? What is its speed?

25.4 Wave Speed think! If a water wave vibrates up and down two times each second and the distance between wave crests is 1.5 m, what is the frequency of the wave? What is its wavelength? What is its speed? Answer: The frequency of the wave is 2 Hz; its wavelength is 1.5 m; and its wave speed is

25.4 Wave Speed think! The speed of sound is about 343 m/s. What is the wavelength of a 680-Hz sound wave?

Wave Language Review Period (T) is the amount of time it takes to complete one cycle (measured in seconds). Frequency (f) is the number of cycles that occur in one second (measured in Hz). Amplitude is the maximum displacement of a medium from its equilibrium position. Wavelength (λ) is the distance between two repeated points (measured in meters). A wave (disturbance) carries energy, not matter. There are two types of wave disturbances: transverse and longitudinal.

Wave Practice

The Physics of Waves https://youtu.be/gi7SeYefIVI