Waves. Mechanical Waves A disturbance in matter that carries energy from one place to another.
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1 Waves
2 Waves Mechanical Waves A disturbance in matter that carries energy from one place to another. Medium The material through which a wave travels. Medium can be any three states of matter: solid, liquid or gas
3 Waves When is mechanical wave created? When a source of energy causes a vibration to travel though a medium. The three types of mechanical waves are: 1. Transverse Wave 2. Longitudinal Waves 3. Surface Waves
4 Transverse Waves Transverse Waves A wave that causes the medium to vibrate at right angles to the direction in which the waves travels. Crest The highest point of the wave above the rest position. Trough The lowest point of the wave below the rest position.
5 Transverse Waves Transverse Waves Examples: 1. Shaking the end of a rope up and down 2. Shaking one end of the blanket up and down 3. Wave in the ball park
6 Longitudinal Waves Longitudinal Waves A wave in which the vibration of the medium is parallel to the direction to the direction the waves travel. Compression An area where the particles in a medium are spaced close together. Rarefaction An area where the particles in a medium are spread out.
7 Longitudinal Waves Examples: Longitudinal Waves 1. Waves produced by earthquakes 2. Sound Waves 3. Ultrasound
8 Surface Waves Surface Waves A wave that travels along a surface separating two media. A surface wave transports an object in a circular motion.
9 Surface Waves
10 Surface Waves Examples: 1. Ocean Waves 2. A fishing bobber floating Surface Waves
11 Properties of Mechanical Waves Period Motion Any motion that repeats at regular time intervals Frequency Number of complete cycles in a given time Frequency is measured in Hertz (Hz)
12 Properties of Mechanical Waves Wavelength The distance between a point on one wave and the same point on the next cycle of the wave.
13 Wavelength How to find wavelength Distance Measure from any identical two successive points (m)
14 What is the wavelength Measure from any identical two successive points (m) 30m 10m = 20m
15 What is the wavelength Measure from any identical two successive points (m) 25m - 5m = 20m
16 Properties of Mechanical Waves Key point Increasing the frequency of a wave decreases its wavelength.
17 Wave Speed Key Point Frequency and wavelength are inversely proportional meaning when one goes up, the other goes down.
18 Wave Speed The speed of a wave changes when it enters a new medium.
19 Wave Speed Calculating Wave Speed Speed = wavelength x frequency Speed (m/s) Wavelength (m meters) Frequency = (Hz Hertz)
20 Wave Speed Examples Example #1 A wave on a rope has a wavelength of 1.8 meters and a frequency of 2.3 Hz. What is the speed of the wave? S = W x F S = 1.8 m x 2.3 Hz S = 4.14 m/s
21 Wave Speed Examples Example #2 A motorboat is tied to a dock with its motor running. The spinning propeller makes a surface wave with the water with a frequency of 4 Hz and a wavelength of 0.1 meters. What is the speed of the wave? S = W x F S = 0.1 m x 4 Hz S = 0.40 m/s
22 Wave Speed Examples Example #3 What is the wavelength of an earthquake wave if it has a speed of 5,000 m/s and a frequency of 10 Hz? W = S / F W = 5,000 m/s / 10 Hz W = 500 m
23 Properties of Mechanical Waves Amplitude The maximum displacement of the medium from rest position. The more energy a wave has, the greater the amplitude
24 Label the following in the wave below: Rest Position Wavelength Crest Trough Amplitude Properties of Mechanical Waves
25 Properties of Mechanical Waves Label the following in the wave below: Rest Position Wavelength Compression Rarefaction Amplitude
26 17.2 Assessment Questions 1. What are the three types of mechanical waves? Transverse Longitudinal Surface 2. How are mechanical waves produced? A disturbance in matter that carries energy from one place to another
27 17.2 Assessment Questions 3. How are transverse and longitudinal waves alike? They both carry energy 4. How are transverse and longitudinal waves different? Transverse carry energy at right angles Longitudinal carry energy parallel
28 17.2 Assessment Questions 5. How is wavelength related to frequency? Inversely proportional (one goes up, the other goes down) 6. How is energy of a wave related to its amplitude? The more energy, the higher the amplitude
29 17.2 Assessment Questions Example #7 A wave on a rope has a frequency of 3.3 Hz and a wavelength of 1.2 meters. What is the speed of the wave. S = W x F S = 1.2 m x 3.3 Hz S = 3.96 m/s
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