Quick Question Give an example of each of

Quick Question: Give an example of each of Newton’s Laws of Motion. Explain how each of these laws are reflected in your examples.

Today’s Objective: I understand how energy travels through waves.

Mechanical Waves: Vibrating disturbance in matter that carries energy.

Medium: A material that energy travels through

Longitudinal Wave Rarefaction: Far apart Compression: Close together Direction of energy

Surface Wave Between two different media Energy moves in circles

Transverse Wave Crest: highest point above the resting place Trough: lowest point below rest Vibrates at right angle to motion

Frequency: the number of complete cycles in a given time Depends on how fast the object is vibrating

Measured in cycles per second Unit: hertz (Hz) 1 Hz 2 Hz

Reflection: waves bounce off a surface No change in speed or frequency

Refraction: So what’s happening here? Bending from entering a new medium Due to a change in speed

Outer wheel travels farther; Time is same for both paths. …speed of outer wheel is faster

Diffraction: Bending around an object

More diffraction if: * wave longer than opening * bigger obstacle

2 Kinds of Wave Interference: 1) Constructive 2) Destructive

Constructive interference: 2 or more combine greater amplitude

Destructive interference: 2 or more combine smaller or no amplitude