Free Fall Investigation, 1st Session.

Isabel and Mnauel have been paired together and we are going to work on Manuel's experiment about how the height from which the ball is dropped affects the distance the ball manages to travel into the jelly.
We have been working on the list of materials:

• Jally powder
• Glass Marble
• Water
• Notebook
• Videocamera
• Video analysis Logger Pro.

Our hypothesis is that the higher the ball is dropped from, the more distance the marbel will travel into the jelly as it will acquire more velocity during he freefall.

24/March/2014

FREE FALL INVESTIGATION, 1st session 

Today in the lab the teacher has explained to us how we are going to work in the following sessions and the criteria evalutaed.

María and me are going to work together but each of us with her own experiment. Eventhough the marks and the work will be individual, we are going to help each other and we have some common materials (as both of us are measuring the deformation of plasticine).

Materials (common ones): 
Camera
Plasticine
Ruler
Logger Pro
Notebook

Materials (my own ones):
7 balls of different materials, and therefore different mass and weight

Today, I did some changes to my experiment as it is easier to work with some different materials than the ones I thought. So I looked for the balls I am going to use (a marble, a plastic ball, 2 balls made out of wood but with different sizes, etc). 

We are very happy witht he group and the work we are going to be doing.

Buthanol Graphs

Here we can see the table, the graph and the conclusion from the experiment of buthanol. To see the rest of the lab report go to previous pages (Wednesday, 19th February post).

Table showing how pressure in kPa varies with time in s.
Buthanol Graph

Time (s) (x)	Pressure (kPa) (y)
335.8	11.6
290	11.6
285	11.2
242.9	10.8
233.2	10.8
224.4	11.2
204.6	11.6
180.6	11.6
167.4	11.5
144.6	10.8
136.7	10.5
122.7	9.7
117.4	7.9
109.5	7.9
100	7.9
70	7.1
0	5.6

Graph showing how pressure in kPa varies with time in s.

Conclusion:According to the results of the table and the graph we can conlude that as time increases, the pressure of buthanol does too. At 0ºC, the pressure was of 5 kPa, after a determined time (increase of time) and with higher temperature (16ºC), the pressure increased to 7 kPa. As we increassed temperature and time passed by, the variation in temperrature continued until it reached 11.6 kPa. This is the maximum pressure of this substance. We continued increasing the temperature and time passed but the pressure started to decrease and then it increased again with 40ºC. As time passes the pressure of buthanol rises because as it is volatile, it goes from liquid to gaseous state, so particles spread and hit against walls more often, there was a slight decrease between second 150 and second 200, maybe due to a change in the temperature or human error. Observing the table and graph we can conclude that as time changes pressure does too. As time increases pressure increases. However, pressure reaches its maximum point in 11.6 kPA. It is a "barrier", because despite the fact that time continues to increase, pressure remains constant. Furthermore, it even decreases to 10.8 kPA, though after 40 seconds it increases again.