Waves.

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Properties of Mechanical Waves

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Mechanical Waves.

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Presentation transcript:

Waves

https://www.youtube.com/watch?v=RVyHkV3 wIyk

Mechanical Waves Transfer energy without transferring matter Needs a material to travel through A moving particle slams into an adjacent particle, which slams into its adjacent particle which slams into its adjacent particle… (think Newton’s Cradle)

Two Different Types Transverse waves (S waves) – Particles vibrate in the opposite direction as the direction of travel. Longitudinal waves (P waves)– Particles vibrate in the same direction as the direction of travel.

Transverse Wave

Longitudinal Waves (P waves)

Brightstorm Wavelength Brightstorm Period/frequency Parts of a Wave Crest – a point on a wave with a maximum value (or “upward” displacement) Trough – A point on a wave with a minimum value (or “lowest” displacement) Amplitude – the maximum distance the particles in a wave vibrate from their rest positions Wavelength (λ) – length of one wave cycle Brightstorm Wavelength Brightstorm Period/frequency Wave Simulation PHET

Label the part of the wave

Brightstorm Video until 2:20 Velocity (v) – How fast the wave is traveling. Unit – meters/second Period (T) – Time it takes to complete one cycle. Frequency (f) – Number of complete cycles in one second. Unit: Hz Wave Velocity = Frequency x Wavelength Brightstorm Video until 2:20

Practice Problems A wave has a wavelength of 15m with a frequency of 0.5Hz. What is the velocity of the wave? Wave Velocity = Frequency x Wavelength Waves velocity = 0.5Hz. X 15m Waves velocity = 7.5m A wave has a wavelength of 10m with a frequency of 1.0Hz. What is the velocity of the wave? 10m/s A wave is traveling at a velocity of 20m/s and has a wavelength of 10m. What is the frequency of the wave? 2Hz

Motion of Particles and types of waves video Transverse Longitudinal Motion of Particles and types of waves video

Relationship Between Frequency and Wavelength As the wavelength increases, the frequency decreases. As the wavelength decreases, the frequency increases.