Hello everyone!!

Today we worked with our K'nex constructions.

The teams are:

• Omega 8 ( Vance, Erik, Viktor, Bryce, Kat, Me, Antonia, Iva)


• K'nex Squad ( Emilie, Laura, Cip, Reza, Julia, Alix, Noam, Fabi)

The credits are:

• Omega 8 ( 4 credits)


• K'nex Squad ( 4credits)

This was mainly all we did in class, good luck for the rest of the project.

Gio, Scribe Post

March 19th Class

Today in class we finally got our Super Heroes back!!!! Some of us posted pictures of our Super Heroes on the bulletin board right outside the Science classroom.

After doing that we went over the Work & Power Math 2 Problems we had for homework.

Some of the questions we did were.....

Question 2.

If 562.3 J of work are used to move a smart car 15.1m, what is the amount of force applied to that smart car?

Formula: W=Fd or F= W/d

Plug: F= 562.3 J/15.1 m

Chug: F= 37.24N

While going over our homework, we also did a quick review on our units and formulas for our quiz on Tuesday.

Here are the units and formulas for Work and Power!

Work = Force x Distance

Power = Work/Time

Work = J (joule)

Force = N (Newton)

Distance = m (meter)

Time = s (second)

Power = W (Watts)

After doing that we went to the computer lab to test another Gizmo. This time was also about inclined planes, however it was harder from what we did last time. We were changing the angle of the inclined plane and the weight of the object falling down the inclined plane to find more about the inclined plane.

So this is what we did in class on Friday. And.........

DON'T FORGET TO STUDY FOR THE QUIZ!!!!!

Study Textbook 108-118, 124-133, also practice solving the worksheet.

If you have questions you should ask Ms.D on Monday.

Be sure to bring your CALCULATOR on the Tuesday.

The next person to scribe is...................

GIO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Cigarettes, Pulleys, and Zippers

Today, we had a very SPECIAL guest come to our even more WONDERFUL seventh grade class. She came to talk about being addicted to...........cigarettes! (For anyone out there who smokes, know that cigarettes also contain chemicals found in whale vomit, make-up, and poison used by the Nazis.) She told us how smoking ruined her private life. She could not do the things she loved like singing and dancing, and how her loved ones constantly worry about her health. Smoking also has the side affects of lung cancer, heart diseases, and many other forms of deadly illnesses. She also mentioned that cigarettes had taken over her life and that when she tried to quit, she would lie to herself, to her husband....




Our class had many questions ???? about smoking, quitting smoking, cost of smoking, well, basically plain old smoking. Even after our guest left, we continued discussing smoking. Here is a wonderful picture showing us a few of the chemicals in something more than 1.3 billion people smoke around the WORLD every day.




Next we had JULIA and GIO teach us about the SIMPLE MACHINE called the PULLEY! Some things that we learned where:

• a pulley consists of a wheel and a rope



• the pulley changes the direction and amount of force needed



• there are 3 types of pulleys; the fixed pulley (most common), the movable pulley and the block and tackle (a combination of both, an example is the crane)



• for a fixed pulley the input force and the output force act in different directions, and the mechanical advantage is 1



• the output and input force of a movable pulley act in the same direction and the mechanical advantage is 2



• a block and tackle's mechanical advantage is 3



• some places pulleys can be found include, flagpoles, wells, garage doors (fixed pulleys), and a crane (block and tackle)

The input force is the rope being pulled down and the output force is the object moving up.





The answer to Tuesday's RaNdoM SciEncE QuEsTIon (Who invented the zipper?) is......Whitcom Judson (clasp locker, a zipper that would be pulled apart), Gideon Sundback (improved it), and Elias Howe (the actual zipper as we know it today).


DO NOT FORGET! DO NOT FORGET! DO NOT FORGET!

Math Sheet due tomorrow! How does Ms D know you tried? The formulas are written down.

There will be a quiz next Tuesday, March 23rd. It will be about WORK, POWER, and SIMPLE MACHINES.



The unlucky person to be the next scribe is .....*drum roll please*................JULIA LEE!





"He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying. "
--------Friedrich Nietzsche

Science Class Tuesday 16th

Hello Seventh Grade!!!

On Tuesday Ms. D reminded us that we only have three weeks left for blogging, so everyone has to make sure they are ontop of their comments. All blog entries must be completed by April 1st at 4 p.m. Don't forget that you have to post two comments on the seventh grade blog, one on the eight grade blog, and one on the Canadian blog!

Next, we had a couple minutes to prepare for our presentations on the six simple machines! We went through every machine exept for the pulley. During the presentations, the students that were watching had to take notes!!!

After the presentations, Ms. D let us know that there is quiz coming! The quiz is going to be on work, power and simple machines, so don't forget to study and brush up on your formulas!

Toward the end of the class, we got our homework assignment, which is random science question number eight. We have to find out who invented the zipper, and write the answer in our lab notebook!

Bellow you can find a video about simple machines. Instead of width the creator of the movie calls it "thickness". I hope it helps you understand the simple machines!

http://www.youtube.com/watch?v=ca1h6f2hcz8&feature=related

HaVe A gReAt St. PaTrIcK's DaY!!!

Thursday 11, Friday 12,2010

On Thursday our class started 15 minutes later. There was so much snow that the whole school started at 10. We did not have Ms. D on Thursday because she was in Kiev. Our substitute for Thursdays lesson was Mr.Tim.

For the simple machine project, all the groups had to either make a poster, prezi or a powerpoint with a visual presentation of the simple machines. The presentation is due Tuesday March 16th.

Here is the link to the simple machines direction sheet:

http://zagreb.ceesa.net/course/view.php?id=105

Groups:

Pulley - Gio & Julia
Wheel & Axle - Viktor & Alix
Lever - Erik, Reza & Vance
Inclined Plane - Laura & Antonia
Screw - Cip & Bryce
Wedge - Kat & Emilie; Fabi & Iva

On Friday our class continued working on our projects. Mr. Tim also mentioned that there is going to be a quiz on work, power and simple machines. The quiz is going to be on Thursday March 18, but the date might change. Most of the presentations were close to being done. A reminder don't forget blogging!!!

The Next scribe is .......... KaT

Scribe post for Friday 5th and Tuesday 9th

Last Friday we went over our homework that was due, which was a math sheet including work and power problems. The questions and answers to the math problems were:

1. How much work is done to move a box if the force applied to that box is 65.7N and it is moved a distance of 12.1 m?
W= Fd
W= 65.7N × 12.1 m
W= 794.97 J

2. If 75 J of work are used to move a motorcycle 3.64 m, what is the amount of force applied to that motorcycle?
F= W ÷ d
F= 75 J ÷ 3.64 m
F= 20.60N

3. If I have used 0.37 N on a marble and it has a work amount of 0.16 J, what is the distance that marble has gone?
d= W ÷ F
d= 0.16 J ÷ 0.37N
d= 0.43 m

4. A skateboarder does 438.84 J of work. If this occurs over a period of 21.8 seconds, how much power does that skateboarder use?
P= W ÷ t
P= 438.84 J ÷ 21.8 s
P= 20.13

5. A construction worker uses a running saw that weighs 35.28 N on a board that is 3.6 m long. If the power output of the saw is 6.35 W, what was the amount of time the saw was used?
W= Fd
W= 35.28N × 3.6 m
W= 127.01 J

t= W ÷ P
t= 127.01 J ÷ 6.35 W
t= 20s

6. How much work is applied to your backpack if 11W of power are used for 681 seconds?
W= P × t
W= 11W × 681 s
W= 7491 J


7. a. A soccer ball weighs 17.3N and can be kicked a distance of 7.5 m. What is the work applied to the soccer ball?
b. If the ball travels that distance in 2.4 seconds, what is the soccer player’s power?

a. W= Fd
W= 17.3N × 7.5 m
W= 129.75 J

b. P= W ÷ t
P= 129.75N ÷ 2.4s
P= 54.06 W

8. a. If a car’s motor weighs 12289.7 N and works at 530893.44 J, what is the distance the car has been moved?
b. Using the above number for work if the car is used for 15 minutes (!!!), how much power has the car used?

a. d= W ÷ F
d= 530,893.44 J ÷ 12,289.7 N
d= 43.2 m

b. P= W ÷ t
P= 530,893.44 J ÷ 900 s
P= 589.88 W

Afterwards, we were handed a project or visual presentation in relation to simple machines. The directions of the visual presentation are on Moodle and the attachment to the directions is under the 15th March-21st March called, Simple Machines Visual Representation Directions. The link to the Science page on Moodle is:

http://zagreb.ceesa.net/course/view.php?id=105

Every group was assigned one of the six simple machines. The groups are:
Pulley - Gio & Julia
Wheel & Axle - Viktor & Alix
Lever - Erik, Reza & Vance
Inclined Plane - Laura & Antonia
Screw - Cip & Bryce
Wedge - Kat & Emilie; Fabi & Iva



On Friday Ms. D Also reminded us that there will be a quiz coming up soon but it will surely not be until Thursday 18th. Our homework was to Finish our Superhero’s by Tuesday. That was all we covered in class on Friday, March 8th.

On Tuesday’s class we began by shortly and basically presenting our Superheroes that were due. All of the Superheroes looked terrific and interesting and so Ms. D announced that she will be hanging then outside in the hallway. After this we went to the upper computer lab and complete an activity Mr. Hays had asked us to check out and play around with. The website we explored was about Gizmos and it was called, Ants on a Slope! We did not only play with the website, we had a packet that we had to complete regarding friction and inclined planes! We had some hypotheses to answer and other activities! This is what we covered in class Friday 5th and Tuesday the 9th.

On the right is an idea of how Ants on a Slope looked like!

The next scribe is Antonia!!! :)

Thursday,March 4th,2010

Today in class we started simple machines, work and power! Yey a new unit!

We took notes on google docs. here are the links:

http://docs.google.com/Doc?docid=0AVp9yP1m8dXjZGdtcDdiNzhfNGRxZG1nOGNt&hl=en&pli=1 By Viktor

https://docs.google.com/Doc?docid=0ASuy_6wKQThjZGY2eDg3Y3FfMWc3ZDN4OGd4&hl=en By Noam

https://docs.google.com/Doc?docid=0AQB2bJ97_6fzZGM0dnM2emZfMGRkOTN2Y2N0&hl=en By Julia

Julia,Viktor, and Noam were our laptop-note takers for the day.

We learned the formulas and simple definitions of these things.

The formula for work is W=Fd be sure to make the W capital because the lower case one s for weight.

For homework we had a worksheet with work & power math problems.

For example one problem looked like this: How much work is done to move a box if the force applied to that box is 65.7 N and it is moved a distance of 12.1 m?

Formula=W=Fd

Plug=65.7N x 12.1 m

Chug=794.97J

Homework for tomorrow is to finish math problems sheet.

THE NEXT SCRIBE ISS IVA!!!!!

Tuesday, March 2, 2010

Today, in science, we started something completely unorthodox, but very fun. We created superheros on this site: http://www.ugo.com/channels/comics/heromachine2/heroMachine2.asp
This is a very easy site to use and has thousands of combinations. In a couple of minutes, you can bang out a character. The lab was to make a science superhero with 5 powers, and to make him save the day with four of them. This was a really great class.
The next scribe is Laura.

Friday, February 26, 2010

Hi everybody! Last Friday, we spent most of the time doing the retakes for the back and forth rockets. All the back and forth rockets from last class didn't work, so the participants were allowed a retake. They didn't work the second time either. After that, we worked on the questions for the lab with our groups. The questions were on the back of the sheet. Afterwards, we learned about our next lab, to design a superhero with the program here: http://www.ugo.com/channels/comics/heromachine2/heroMachine2.asp

That's it. Thanks for listening/reading!