Microscopes and Cells

Hello everyone!




On the 13th and 14th of May in Science class we have showed our cell project to our classmates and we have worked on an assignment in order to discover the mycroscope!

For the cell project we were supposed to find a common object from our house that meets the function of the organelles (little organs) within the cell and with it make a 3D diagram of a cell!






As for the Microscope project we learned what the different parts of a Microscope are as you can see on the left:

• Ocular Lens (Eyepiece)
• Body Tube
• Revolving Nosepiece
• Arm
• Objectives (there are 3 or 4 of them on a normal microscope)
• Stage
• Stage Clips
• Diaphragm
• Light Source
• Coarse Adjustment Knob
• Fine adjustment knob
• Base

What we did was partner up with someone and cut the letter "e/E" from a magazine. After that we took a microscope, a beaker with water, a pippete, two glass slides and two cover slips. We put the "e/E" on the glass slide and put a drop or two on it. We then dropped the cover slip from a vertical position onto the "e/E" in such a way that no air or water bubbles will remain. After that we looked trough the eyepiece of the microscope trough the smallest objective (4x, but with the eye piece = 40X). We then saw that the "e/E" was seen upside down because the light refracts trough 5 lenses. If hte number is even then you will see the "e/E" as it is but if the number is odd you will see it upside down. Then we made a formula to find out the magnification power of a microscope.

Here it is:

Magnification of eyepiece (e.g. 10 x) multiplied by Magnification of objective (e.g. 100 x) = Total magnification (1000 x)







Lastly, Ms. D told us what homework we have which is the blog comment, to read chapter one in our book and take notes from it.







The next scribe is Alix

Reflection Post

What I liked in this quarter about blogging is that we got to scribe about very interesting stuff. We also commented on the 8th grade's blog. The hardest thing in blogging this quarter was writing for the Canadian blog because we had to be very formal and also because we had to read their posts which were extremly long and complicated. What I din't like was the fact that we had to make so many posts.

THE MUDDIEST POINTS IN BLOGGING

Blogging was a whole new thing for all of seven grade and even though it was a lot of fun I had encountered several problems during this quarter. First of all, it took a long time to put the movies or pictures on and you couldn't arrange them anywhere you wanted. Secondly, you couldn't add pictures or movies to the comments you made and it made it harder for us to improve the person's post. Even though we had a few problems the project itself was extremly fun and I strongly agree on another quarter full of blogging!

Hello 7th graders! I want to start the post with a picture of us today (because we were outside in the freezing cold).











Today we started the class with the checking of our homework. The homework was a sheet of paper with acceleration problems. A type of an acceleration problem (and the answer) would look like this:

A cyclist began from a rest point at the top of the hill, then he starts downward and reaches the bottom with a speed of 50m/s in 20s. What was the acceleration of the cyclist? The problem would be solved like this:

Formula: acceleration = (Final velocity-Initial Velocity) /time

Plug: acceleration = (50m/s - 0m/s) / 20s

Chug: acceleration = 2.5 m/s/s or 2.5 mps 2(the two shows that "s" is squared)
or 2.5m/s 2(the two shows that "s" is squared)




After this we worked on a lab called Acceleration/Deceleration Testing". We first went outside into the main courtyard where we tested our capability of timing and the exactity of the timing. After several minutes of trying we were good enough. After this, we went outside and we arranged the whole class in a line at one meter intervals. There we each took our stopwatches and measured the exact time it took the ball to reach each one of us from the starting point. A very smart idea was using the gutter which had the sides tilted and that way the ball didn't follow another path. We measured 3 different kinds of balls, a ping pong ball, a tennis ball and a soccer ball. I, for example stayed at the four meters mark and collected the following data:

• ping pong ball: distance= 4 meters, time= 2.83 seconds, therefore speed= 1.41 mps
• tennis ball: distance= 4 meters, time=2.23 seconds, therefore speed=1.79 mps
• soccer ball: distance=4 meters, time =2.43 seconds, therefore speed=1.64 mps

For homework we reiceved the task of calculating the average speed of the time it took the three balls to reach us and also the speed of the three balls.





I also choose a movie about a peculiar Mr. Willard that might help you guys with the accleration problems. It's also kinda cool because it uses Ms. D's symbol for change (the triangle). These two movies were (in my opinion) clearl and understandable.

Before you comment look at the movies please

Next scribe is Alix