Phase change

A phase change is a change from one state to another. One phase change that I saw outside of class was when an ice cube turned into water, I placed one ice cube on the table and I saw that it was slowly turning into water. This happens because the ice cube wants to be the same temperature as the table. The table is giving its heat to the ice cube so the ice cube's molecules will start to move faster, and when the molecules move faster they have harder time holding on to each other, so the ice cube becomes less solid and more liquid. The heat is being removed from the table and adder to the ice cube. The ice cube changed from a solid to a liquid, this transition his called melting.

Too Hot/ Too Cold

        Three things that heat up at different rates are: water, metal and glass. This is because some substances requiere less heat energy to increase their temperature, this is called "Specific Heat". Also since metal is a conductor and glass an insulator it would be easier for the energy to go through the metal so it will get heated up faster. 🔥

Doppler Radar

    I think that waves are used to show what is happening on the weather by showing when there's storms, huracanes or other natural disasters. Probably when the waves have a higher frequency is when the storms are getting closer to us and when the frequency is lower it means that it is far away.

   After some reacher I know that the basics of radars is that a beam of energy, called radio waves, is emitted from an antenna. As they strike objects in the atmosphere, the energy is scattered in all directions with some of the energy reflected directly back to the radar.

Interferences

The difference between constructive and destructive interference is that contructive interference is when the crest of a wave has been combined  with the crest of another wave to increase its amplitude while a destructive iterference is when the crest of a wave is combined with the trough of another wave to decrease the amplitude they are the opposite of each other.

Constructive interference 

 An example of constructive interference is when someone is on a swing because the person keeps adding force on the swing to make the swing go higher. An exaple of destructive interference is whan you drop 2 drops of water in a pool (or anything that is holding a liquid) at different times.                                     
 
           

Destructive interference

   

Standing wave

Today we did a lab in class that was about making waves with different wavelenghts, we wanted to find out the frequency of the waves in 10 seconds. From this lab I learned that the more wavelength there is in a wave the less frequency it has. This means that if you have a wave with a wavelength of 6m its frequency is going to be small and if you have another wave with a wavelength of 1.2m the frequency will be higher, and an the end when you calculate the speed of both waves the 2 waves will have a similar speed.

No effect

I thought that the weather affected people's feelings but it really doesn't because some people might like rainy days but not sunny days and other might be the opposite or like both or none.

I also thought that the louder we talked the fastests we will ear but how loud or how low you talk doesn't affect how fast or slow we hear. I learned this because the teacher explained us.

Simple harmonic motion

You know that something is simple harmonic motion if it goes up, down or back and forth. An example of simple harmonic motion is a slinky because it goes up and down, another example is a pendulum because it goes to the sides and the last example is a guitar this is simple haemonic motion because when a musician strums a guitar the vibration of the string creates sound waves that we ear as music.