WAVES in MOTION When you think of waves you probably think of waves that surfers ride in the ocean But water waves are just one type of wave Light waves create the colors you see with your eyes Sound waves make the sounds you hear with your ears Waves are vibrations or disturbances that travel through a medium or an empty space They transfer or move energy from one place to another in regular patterns HOW ARE WAVES MADE Matter is anything that takes up space and has mass Mass is the amount of material in an object Orange juice your television and the air around you are all forms of matter When a force is applied to matter it vibrates This changes the matter from its rest position by making it move up and down or side to side This creates waves Waves carry energy from the force They travel away from the source in the form of a wave The matter returns to its original position once the energy passes through it When the waves run out of energy they stop
When you knock on a door the place you hit vibrates The vibration makes the air around the door vibrate too The sound waves created by the vibrations carry the knocking sound to your ears When you stop knocking the vibrations stop too Without vibrations there are no sound waves You stop hearing the sound iiiiiiiiiiiiiiiiii WAVES TRANSFER INFORMATION There are many types of waves that transfer energy But did you know that some waves can also transfer information from one place to another Information is any type of data that can be put into a message national LLNL East or observed such as phone calls or text messages Telephones televisions and radios all use waves to send and receive
PATERNS of INFORMATION Waves are regular patterns of motion They have specific properties that create patterns of movement These properties include amplitude wavelength and frequency Wavelength Amplitude Amplitude Frequency Amplitude is the height of a wave from its center or resting point to its tallest point or crest It can also be measured from the resting point to its lowest point or trough Wavelength is the length from one point on a wave to the same point on the next wave It is usually measured from crest to crest or trough to trough Frequency is the number of waves that pass through a certain place in a specific period of
TYPES of WAVES There are two types of wave patterns transverse and longitudinal Transverse waves move up and down Think of a rope tied to a tree If you move the free end of the rope up and down you can make a transverse wave Transverse wave Longitudinal waves move horizontally or from side to side If you move a Slinky toy back and forth you are representing the movement of a longitudinal wave Longitudinal wave COMMUNICATING INFORMATION WHATDO Doyon THINK Think about the world Waves are repeating patterns A pattern is around you How many anything that regularly happens over and over patterns can you spot again We can predict and interpret patterns Can you think of any and use them to communicate ways you use codes Some patterns are easy to see We and symbols in a know the sun rises in the east and sets in pattern to communicate the west each day Using the alphabet we with others create patterns of letters that form words and phrases Other patterns use codes and symbols that we need to interpret In order to decode the pattern both the sender and the receiver need to know the code To decode means to figure out the meaning of a coded message Can you figure out the code used to write this sentence Eht уks si
