Chapter 17 Waves and Sound.

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Presentation transcript:

Chapter 17 Waves and Sound

Section 1

Key Concepts What causes mechanical waves? What are the three main types of mechanical waves?

Where do waves get Energy? Ultimately from objects Vibration – any movement that follows the same path repeatedly A vibrating object gives off its energy to nearby particles next to them. These particles in turn give off energy to the particles next to them

What Are Mechanical Waves? a disturbance in matter that carries energy from one place to another. Mechanical waves require matter to travel through. The material through which a wave travels is called a medium. A mechanical wave is created when a source of energy causes a vibration to travel through a medium.

Types of Mechanical Waves The three main types of mechanical waves are transverse waves, longitudinal waves, and surface waves.

Transverse Waves Link a wave that causes the medium to vibrate at right angles to the direction in which the wave travels. Crest Direction of wave Rest position Rest Position Direction of vibration Trough

Transverse Waves The highest point of the wave above the rest position is the crest. The lowest point below the rest position is the trough (TRAWF). Before the wave starts, every point on the rope is in its rest position, represented by the dashed line.

Longitudinal Waves Link2 Link is a wave in which the vibration of the medium is parallel to the direction the wave travels. Compression Push Pull Direction of wave Rarefaction Rest position

Longitudinal Waves An area where the particles in a medium are spaced close together is called a compression An area where the particles in a medium are spread out is called a rarefaction (rehr uh FAK shun).

Surface Waves Link a wave that travels along a surface separating two media. A Combination Wave Wave direction As the ocean wave moves to the right, the bobber moves in a circle, returning to its original position.

Reviewing Concepts 1. Describe how mechanical waves are produced. 2. List the three main types of mechanical waves. 3. For each type of wave, compare the vibration of the medium to the direction of the wave. 4. Name one example of each type of wave.