Wednesday, September 21st

Today in class we completed the Metric measurements handout and reviewed correct answers.  Use this to study for Friday's quiz!  Tomorrow we have a measuring activity for practicing using the ruler, graduated cylinder and triple beam balance.

You will be doing a peer review and editing your CER's for Friday turn in.  Make sure to add notes in a different color of pen.  Add in things you are missing in your CER, write answers in your own words after discussing and sharing out what you did in your teams.  As for revisions, there are new copies of the template so you can rewrite the work neatly and staple the edited copy on the back of the revised and rewritten CER handout.

NEW CER DUE ON FRIDAY MUST BE IN BLUE OR BLACK INK AND MUST BE NEATLY WRITTEN, IF I CAN NOT READ IT IT WILL BE GIVEN BACK AND WILL NOT BE SCORED UNTIL FIXED!!!



Notebooks are collected tomorrow, please work on organization, table of contents, and finishing all assignments for grading.

If you have time in class today, work on getting Notebook ready for turn in!

samples of Evidence and Reasoning:
E1:  a list of data, not explained or analyzed

with 2 ml of water rocket went 20 ft
with 10 ml of water rocket went 13 ft
with 15 ml of water rocket went 11 ft
with 5 ml of water rocket went 16 ft


R1:  explain what the data means in 2-3 sentences

In our experiment the data shows a consistent pattern.  The less water we used the higher the height the rocket flew.  We see that with 5 or 2 ml of water we had the best launches.  There may be a point where small amounts of water is not enough and there is not enough liquid to cause a powerful chemical reaction to make the rocket launch.  We need to investigate those small values in another test, but so far less liquid a better launch.




E2:  quote the article about the Rockets and discuss the chemical reaction and the physics behind the launch!  

In the article it states "the thrust, or push, of your rocket is related to how much pressure built up inside the canister before the top popped off".  

"Newton's third law:  For every action there is an opposite and equal reaction"



R1:  In order to get a high launch we want the rocket to have a lot of thrust.  When the alkaseltzer tablet mixes with water it creates carbon dioxide gas.  There needs to be a lot of pressure to build up and push the lid off so the rocket flies.  Newton's third law means that as the lid pushes down on the ground the rocket canister pushes up into the sky.





E3:  List out your  hang time and wait times of the rocket

20 ml:  .90 sec hang time, 1.1 sec wait time
15 ml: 1.71 sec hang time, 2.5 sec wait time
10 ml: 3.55 sec hang time, 3.4 sec wait time
5 ml: 2.16 sec hang time, 3.5 sec wait time


E3: 2-3 sentence explanation....Although the 5 ml rocket wasn't in the air the longest, it still went the highest  We see that at 10 ml there was a lot of time to build up pressure and gas.  This launch was one of our highest. We see that the wait time shows pressure built up the most in 5 ml of water, and the most force or push was for the 10 ml launch that stayed in the air for almost 4 seconds!!!