Standing waves photo Mara Stephen

We determined the speed of the wave on the string by using the speed=frequency times wavelength formula. We got the frequency to be 30.2 Hz and the wavelength to be 113 centimeters. We then converted 113 centimeters to be 1.13 meters. We multiplied 30.2 Hz by 1.13 meters to get 34.13 m/s to be the speed. We alos determined that there were 6 antinodes becasue there were 2.5 waves.

Standing Wave Photo Terry and Cassidy

Terry and Cassidy

We used the frequency generator and were able to make a standing wave and then we got the camera and took a snapshot of the standing wave. We measured the string which was 2.5 meters long. In our picture we had 6.5 waves. We divided 6.5meters by 2.5meters and got the wave length which was .38 meters for each wave. We then got the speed of the wave by multiplying
the frequency of the wave which was 72.9Hz and the wave length which was .38 meters long which gave us our speed of 27.7 m/s

Standing Waves Photo

After playing around with the frequency generator I was able to find some standing waves and then I took a picture of the standing wave with my phone . After taking the picture I was able to find the speed of the wave by multiplying the frequency of the wave which was 18.13Hz and the length of the wave which was .96 meters long. After multiplying the two I found out the speed which was 17.56m/s.

Decibel Levels Around The School

The decibel for the clock was 46.3 decibels.

The decibel for the fire alarm was 49.8 decibels.

The decibel for the light was 53.6 decibels.

The decibel reading for the tv was66.52 decibels.The decibel reading for the tree was 52.2 decibels.

A decibel is the unit used to meassure sound and the electrical signal that come from it. It also meassures loudness. You meassure deciebels by using a decibel meter to meassure the electrical signals and the sound that comes from an object. Each thing has their own decibel so nothing else can have the same number.

Energy Skate Park Challenge-Morgan

http://screenr.com/1L3s

After completing the energy skate park challenge I concluded that when we say that energy is conserved we are saying that there is never Kinetic(KE) or Potential Energy(PE) that excell the Total Energy(TME). Just as it shows the bar graph on the side when there is less KE there is more PE to make TME. And if there is less PE there has to be more KE to also make TME. Then KE can also equal PE to make TME. That is what is meant when we say energy is conserved!

Energy Skate Park Challenge

After compleating all the challenges we concluded that when it says conserved energy it means that the object or person isn't using all of it's energy it's just using some of it. For the third challenge we concluded that you can predict the velocity of the skater by using a few equations, but first you have to find out the masses the height then use those numbers and the gravity in an equation. For the second challenge we found out that friction greatly affects conservation of energy, because when there was no friction the skater had no problem going up and then coming back down without using all of it's energy, but when we added friction we had use all of the skaters energy to get up the track.

Energy Skatepark Challenge

http://www.screenr.com/yYos

I did the first challenge for this extension. Which made me think "What does it mean when we say energy is conserved." Energy that is conserved can be explained multiple ways in this situation. The TME bar on the right side of the bar graph stays the same throughout the time the skater is on the track. On the curve graph, It shows that the KE and PE repeat itself throughout. They never go higher than the TME. Whenever the KE is low and PE is high, TME stays the same. Vice versa with TME being the same. But throughout the skaters ride, the TME never changes which shows that energy is conserved.