Systems, and a project.

Systems, and an individual project.

Remember everyone if you are having trouble understnading what I am saying please refer to my previous post if you STILL have trouble go to Mr.Foster early or after school, and everything will be dandy.

Ok so firstly here are some notes you need to remember.

-Undersired outputs are called side effects.
-All systems evolve when humans are impacting the system.
-An example of this is global warming.
-Human input may change the outputs and/or side effects

Good Effects that we do:

-Energy use reduction
- Hybrid Cars
- Sierra Club/ and WWF

Bad Effects:

-Water overus
-food waste
-cars and pollution
-Habitat destruction

These and good effect affect something called Global Climate Change.

Individual Project:
For those who missed the class you will be given a page with information on the porject which involves surveying people you know unless you really want to survey people you aren't familliar with, and so get the page tomorrow morning if you missed the class.

Systems: Open? or Closed?

What is a system? A system is a group of mechanisms that is used to do a function (lifting someting off the ground, or pulling snow off the ground, etc.In the world of systems we have learned about two. These are called open and closed. An open system means that at the end of the system there is a opening where a liquid, fluid or substance... pretty much anything, will eventually come out. Examples of this are: A car, because the exhaust comes out the back, the digestive system...if you know what I mean. Whatever comes in must come out, these systems never let the materials inside of them circulate.

Closed System:

This system has no start or stop button. These systems usually run in a circular motion allowing nothing to escape. An example of this is your body's ciculation. Heart pumps oxygen into cells, cells come back to get more oxygen, it is a continuous cycle.

Feedback:
The problem with any system is that without feedback you cannot know whether or not everything is going well. If you are at one end of a conveyor belt you can't see what's coming off of the other side, so it is wise to get FEEDBACK! You're brain is constantly getting feedback from the rest of your body.

The Five Simple Machines You Need To Know.

Hello FI8D!

In this blog I will be talking to you about two different simple machines.

(FOR LEVERS REFER TO A BLOG POSTED 2 WEEKS AGO)

The Wedge:

The wedge is similar to an inclined plane but is of course different. A wedge is usually used to keep something in place or separate two different objects. A door stopper is a wedge because it keeps a door from moving.
How do you find the MA of a wedge? divide the slopes length by its length at the end that is thickest.

The Pulley:
Do you remember when you were little, and maybe had a tree house? Well for me I would take a rope, attach something like a sandwich to the end of it and pull it up into my tree house, but a pulley is slightly different because instead of pulling the rope yourself you have to install a fixed pulley which is a way of saying a circle with a piece of metal that is attached.

If you are having trouble visualizing GOOGLE: FIXED PULLEY and it will be very easy to find on google images.

NO SCIENCE!

Hello Everyone,
Today we didn't have science class due to the RESPONSIBILITY ASSEMBLY. Congratulations to Hannah McMillan (sorry if I spell your name wrong). Remeber to try to go over your notes for any future pop quizzes. Review:
-MECHANICAL ADVANTAGE.

Important dates:
November 3rd: web outline+ materials (toy story project)
November 9th: Web outline+ technical drawing (toy story project)
November 17th: Calculation, research report, construction.

Hope you have a nice review of everything!