Homework for 11/29/11 -


7th Gr. -
A) Study for your vocab quiz. Vocab words on the quiz are: control, circulatory system, indicator, pulse, regulate, respiratory system, and Recovery Time (defined in book as "the time it takes for your pulse to return to within 20% of your resting pulse". Be sure to add this to your vocab section.  If you are missing any of the other definitions, I'll rewrite them at the bottom of this entry, after the 6th graders' assignments).



B) write a Hypothesis about an activity you could use to cause your pulse rate to increase.


C) Also write or print the following notes on a separate piece of paper and insert it into your science notebook after the Nov. 1, 2011 lesson "Support System: Bones, Joints and Muscles":


"Simple machine - a machine that makes work easier. It takes the effort that you put into the machine and changes its size, direction, or speed. Six types of machines (the "Classical Simple Machines") have been studied since the Ancient Greeks and are still built into our devices today, including the:
1. Lever – a bar that is free to turn around a fixed point; the fixed point is called a fulcrum; 3 classes. Ex: scissors.
2. Wheel & axle – 2 different sized wheels that turn together around the same point, called an axle. Ex: pencil sharpener, wrench & bolt.
3. Pulley – rope wrapped around a wheel. Ex: motor belt; bike chain around the gears (sometimes called a "derailleur").
4. Inclined plane – slanted surface, or ramp. Ex:Truck ramp.
5. Wedge- a double inclined plane. Ex: knife blade; fire axe.
6. Screw- an inclined plane wrapped around a cylinder.


D) Tomorrow at the beginning of class, I will check your Simple Machine notes, as well as your Reflection and 5 STAR note questions from yesterday.
 
6th Gr. Per. 2- For those who are taking the vocab quiz tomorrow, study your vocab homework.  All students should work on their project re-write.  Due Friday, no further extensions. 


6th Gr. Per. 3 -
a) For the vocab quiz tomorrow, study your vocab homework.
b) Bring in a piece of plastic with a number in a triangle on the bottom. 
c) ON A SEPARATE PIECE OF PAPER, answer Analysis Questions 1 & 2 on pg. B-37:
    1. Using evidence from your table, "Properties of Plastics", identify the plastics which were scratched.  How will this property affect their use? 
   2. Below is a scale (If I can't completely reproduce it here, you need to check the electronic version of the book using your Resources for Students half-sheet that you are supposed to keep in your science notebook) showing the relative density of the four liquids you used to determine the density of the plastics. 
      a. Which plastic sample was the most dense?  Explain your evidence. 
      b.  Which plastic sample is the least dense?  Explain your evidence.

 7th graders: your vocab term definitions are:

• control- A standard of comparison for checking the results of an experiment. In the  experimental group,  a single variable is changed. The results are compared to the control in order to see if the one changed variable had any effect.
• circulatory system- system of organs and tissues, including the heart, arteries, veins, and capillaries that transports nutrients, oxygen and waste around the body.
• indicator- A chemical that indicates the presence, absence, or concentration of a particular substance.
• pulse - rhythmic stretching of arteries caused by blood being forced through the arteries by contractions of the heart.
• regulate - the process of keeping chemicals and conditions in the body balanced.
• respiratory system -  The system of organs that work together to take oxygen into the body and to remove carbon dioxide from the body.