ch25_pswc

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 * __Vibrations and //Waves//__ **

-A wave is wiggle in space and time**
 * -A vibration is known as a wiggle in space

__**Vibration of a pendulum**__- Pendulum swing so consistantly they have been used for clock fors centurys __**Frank oppenheimer**__- showed the pendulum back and forth it produces a sine curve. this show that it moves at a constant speed.



> > > **__Transverse waves__**- wave created bu shaking a rope or object of a diffrent object > the medium is at a right angle to which way it travels > > > **__Longitudinal waves__**- more back and forth called compression waves > > **__Inferance pattern__**- when two wave overlap > > __**Constructive pattern**__- is where they combng and dont interfer. > > **__Destructive interferace__**- cancalles out or disrupts > > **__Standing waves__**- have nodes that stay still and anti-nodes that are in between > > **__Doppler Effect__**- when a police car speeds past and you hear the siren change pitch, This happens because the sound waves coming from he siren are effected by the speed of the police car and which direction it is travleing in.
 * **__Crest__**- high points
 * __**Troughs**__- low points
 * __**Amplitude**__- distance from the mid point to the top
 * __**Wavelength**__-distance of the wave crest to crest


 * __Bow waves__**- when the speed of medium is the speed of the wavesh

__**Shock waves**__- produces an overlapping effect