Wednesday April 11, 2018 Do-Now

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Presentation transcript:

Wednesday April 11, 2018 Do-Now Write down your thoughts on the following cartoon.

Wednesday April 11, 2018 Announcements Past Due: Chapter 13 Vocabulary Parallel Circuit Problems Vocabulary 21 Fill in the Blank-Manga Guide to Electricity Circuit Lab Quiz- Waves Start looking over todays notes on waves

This lesson is brought to you by… SP4. Obtain, evaluate, and communicate information about the properties and applications of waves. a. Develop and use mathematical models to explain mechanical and electromagnetic waves as a propagating disturbance that transfers energy. (Clarification statement: Mathematically describe how the velocity, frequency, and wavelength of a propagating wave are related.

WAVES

A wave is a disturbance that propagates (spreads out or travels through) through a medium or phase. All kinds of waves are characterized by a transfer of energy without the large-scale transfer of matter.

Mechanical waves- Require a medium for their propagation To generate mechanical waves, two things are required: A source of energy An elastic medium to transmit the disturbance

Transverse wave- wave in which the vibrations are at right angles to the direction of propagation of the wave. Ex: surface water waves, electromagnetic waves (light, radio, microwaves, UV, infrared, x-rays, etc.)

Longitudinal wave (compressed wave) – wave in which the vibrations are parallel to the direction of propagation of the wave. Ex: Sound waves Shock waves Slinky waves

Characteristics of Waves Equilibrium/Rest

Characteristics of Waves Frequency (f)- the number of crests or troughs passing a given point in a unit of time. The SI unit of frequency is the Hertz (Hz). One Hertz is equal to one cycle per second, or 1/s since a cycle is not a unit. T= 1/f and f = 1/T

wavelength- (l)- the distance between any particle in a wave and the nearest particle that is in phase with it. l is the symbol for wavelength and the units are meters.

Speed- the speed of a wave depends primarily on the nature of the wave disturbance and the medium through which it passes.

Speed (cont.) v = f l This equation is true for all waves. V=velocity f=frequency l = wavelength

Amplitude- the maximum displacement of the vibrating particles of the medium from their equilibrium (or rest) positions.

Damping- the reduction in amplitude of a wave due to the dissipation of wave energy as it travels away from the source.

Wave Facts The speed of a wave depends on the medium The amplitude of a wave does not affect its wavelength, frequency, or velocity The speed and wavelength of a wave change when the wave enters a new medium The velocity of a wave is higher in a more rigid medium Whenever a wave reaches a boundary, some of the energy is transmitted, some is reflected

Crash Course Physics: Traveling Waves https://www.youtube.com/watch?v=TfYCnOvNnFU

Chapter 13 Vocabulary 13.1 13.3 13.2 13.4 Periodic motion Period Wave Frequency Hertz Simple harmonic motion Restoring force Amplitude 13.2 Simple pendulum Natural frequency Resonance 13.3 Wave Transverse wave Longitudinal wave Crest Trough Wavelength Medium Mechanical wave 13.4 Resultant wave Principal of superposition Constructive interference Destructive interference Standing wave Node Antinode