1. 14.1 Types of Waves I CAN: -I CAN RECOGNIZE THAT WAVES MAY BE ABSORBED BY OBJECTS AND BE TRANSFORMED INTO ANOTHER ENERGY.

2. What is a wave?  Wave: disturbance that carries energy through matter or space.  Most waves travel through a medium.  Medium: physical environment in which phenomena occur  Solid, liquid, gas (any matter)  All waves are mechanical or light.  Mechanical: wave that requires a medium through which to travel.  Electromagnetic (light): consists of oscillating electric and magnetic fields, which radiate outward at the speed of light.

4. Example  A pebble falls into a pool of water and ripples form.  Because it is moving, the falling pebble has energy.  As it splashes into the pool, the pebble transfers some of its energy to nearby water molecules, causing them to move.  What you see is energy traveling in the form of a wave on the surface of the water.

5. Waves transfer energy  Energy is the ability to do work.  Water waves can do work on a leaf or boat.  Sound waves can do work on your ear drums  Light waves can do work on your eye.  Approaching waves bump against your boat, but they don’t carry it along with them as they pass.  All waves have this property—they carry energy without transporting matter from place to place. (rope w/ribbon)

6. Energy may spread out as a wave travels  Why is it that standing too close to a speaker can harm your ears, or looking into a light bulb closely can harm your eyes, but when standing far away, the speaker and light bulb are harmless?  Each circle is called a wave front.  Circle gets larger, so energy is more spread out.

7. Vibrations and waves  Most waves are caused by vibrating objects.  Electromagnetic waves may be caused by vibrating charged particles.  In mechanical waves, the particles in the medium also vibrate as the wave passes through the medium.  Vibrations transfer energy.  Potential vs. kinetic.  Simple harmonic motion.

8. Damped harmonic motion: vibration fades out as energy is transferred from one object to another. Other examples of dampening devices? Leaf springs & shock absorbers.

9. Transverse and Longitudinal (compressional) Waves  https://www.youtube.com/watch ?v=akbv_VJFSLk https://www.youtube.com/watch ?v=akbv_VJFSLk  Transverse wave : a wave in which the particles of medium move perpendicular to the direction the wave is traveling.  Longitudinal wave : matter in the medium moves back and forth along the same direction that the wave travels.

10. In a surface wave, particles move in circles.  Surface waves: occur at the boundary between two difference mediums such as water and air.  Water waves