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Mechanical Waves.

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Presentation on theme: "Mechanical Waves."— Presentation transcript:

1 Mechanical Waves

2 What is a mechanical wave?
A disturbance in matter that carries energy from one place to another. Require a material to pass through called a medium. A medium can be a solid, liquid, or a gas. 3 types of mechanical waves. 1. Transverse waves 2. Longitudinal waves 3. Surface waves

3 Transverse waves Cause the medium to vibrate at right angles to the direction of wave motion. Wave motion Slinky motion

4 Parts of a transverse wave
wavelength Rest position node wavelength

5 Trough – the bottom of a wave.
Crest – the top of a wave. Trough – the bottom of a wave. Wavelength – the distance from crest to crest or trough to trough. Node – where the wave intersects the rest position. Amplitude – distance from the rest position to a crest or trough – measures energy. Frequency – how many times the wave cycles in a given time period. Usually measured in Hertz (Hz) – cycles per second Low frequency High frequency

6 Wavelength and Frequency
These 2 are related As one increases, the other decreases. Low frequency, large wavelength High frequency, small wavelength

7 Longitudinal Waves Compression waves
Move the medium the same direction as the wave. Made from compressions and rarefactions Wave motion Slinky motion

8 Surface Waves Travel along the surface separating 2 media.
Ocean waves travel between water and air Have characteristics of both longitudinal and transverse waves. Transverse part causes up and down motion. Longitudinal part causes back and forth motion.

9 Wave Speed Speed = frequency X wavelength n f l n = speed (m/s)
f = frequency (Hz) l = wavelength (m)

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