Monday, March 20, 2017

8th Grade Study Guide and Video

The 8th Grade will have a test over Work, Energy and Simple Machines on Thursday, March 23.  The study guide is due the day of the test for full credit (25 points).

The study guide may be copied and printed from here.

Work, Energy and Simple Machines Test


Name_________________________


Study guide is due the day of the test.  


  1. What do Newton’s laws of motion tell you?
  1. What is Newton’s third law?
  1. What is the definition of energy?
  1. What is radiation?
  1. State the law of conservation of energy.
  1. Define what is meant by the word work in science.
  1. What is an inclined plane and what does it do?
  1. Which form of energy is not carried by waves?
  1. What is the relationship between a 2 kilogram and a 4 kilogram block?
  1. What is the difference in mass of an object on Earth and on the moon?
  1. How many newtons of force would it take to keep a sliding 10 kg mass moving on a frictionless surface?
  1. What is a vector quantity?
  1. A player hits a ball with a bat.  The action force is the impact of the bat against the ball.  The reaction force is the
  2. What is another name for a change in velocity?
  1. What is inertia?
  1. Explain the energy conversion in a car that is being slowed using the brakes.
  1. A 1000 kg car and a 2000 kg car are hoisted the same distance on a lift.  The more massive car requires
  1. Which requires more work: lifting a 50 kg sack 2 meters or lifting a 25 kg sack 4 meters?
  1. What is kinetic energy?
  1. If one person pushes to the left with 100N of force and another person pushes the same object to the right at the same time with 150N of force, what is the net force and in which direction?
  1. Describe all three classes of lever.
  1. What does velocity tell you?
  1. How far would a car traveling at a constant speed of 80 mph go in 4 hours?
  1. What is friction?
  1. What class of lever is a pair of scissors?


The video assistance is also available here. (I promise I am not yelling)



The Week of March 20

The 8th Grade has completed a study of Work, Energy and Simple Machines. We will have a test on Thursday March 23.  The study guide and video will be available later this week.

The vocabulary words for the week are as follows:

Monday:
     Pulley
     Complexe machine
     Efficiency

Thursday:
     No words, test.

The 7th Grade will continue a study of the Earth's Atmosphere.  We will be looking at global wind patterns and Air Quality.

Vocabulary words for the week are as follows:

Tuesday:
     Polar easterlies
     Jet stream

Friday:
     Sea breeze
     Land breeze

Wednesday, March 15, 2017

8th Grade for the Week of March 13

Students will continue to study Work, Energy and Simple Machines.  Vocabulary words for the week are as follows:

Tuesday:
     Simple machines
     Inclined plane
     Screw

Thursday:
     Wedge
     Lever
     Pulley

Vocabulary Words for 7th Grade Vocabulary Quiz 3/17

The following words will be on the vocabulary quiz on Friday 3/17

subduction zone
divergent boundary
asthenosphere
osmosis
chlorplast
proteins
lipids
homeostasis
troposphere
convection
observation
species

The definitions may be found using the class Quizlet here: Quizlet

Monday, March 13, 2017

The Week of March 13 7th Grade

First day of FOURTH QUARTER!!!

The 7th Grade students will continue to study the atmosphere.  On Monday we looked at Bernoulli's principle.  We finished the Prezi over Atmosphere in class and completed the notes.  We will continue the study with a section on Energy Transfer in the Atmosphere and then look at Global Wind Patterns.

Vocabulary for the week is as follows:

Monday: 
     Convection
     Stability

Wednesday:
     Temperature inversion
     Wind

Friday:
     Trade wind
     Westerlies

There will be a vocabulary quiz on Friday, words will be posted later this week.

The Prezi may be viewed here: Atmosphere Prezi

Prezi Notes:

Earth's Atmosphere

The atmosphere is a thin layer of gases that forms a protective covering around the planet.
Earth's atmosphere maintains a balance between the amount ___________________
______________________________________________________________________
Earth's atmosphere was very different 3.8 billion years ago.
The early atmosphere did not contain free Oxygen, the air was mostly _____________
_______________________________________________________________________
Archaebacteria used the materials in the atmosphere to produce food through a process called ___________________________.
About 2.8 billion years ago a new group of organisms began using energy from the sun to do a process called photosynthesis.
Photosynthesis released Oxygen into the ocean water which caused the oceans to "rust" for several million years.
The organisms that started this change are called Stromatolites.
Evidence for the rusting oceans is ___________________________________________.  Each layer represents a period of time when "rust" precipitated from the ocean water and settled to the bottom.
It was not until all the iron dissolved in the oceans had reacted with the oxygen and settled that the oxygen levels in the atmosphere started to increase.
Once oxygen levels started to increase in the atmosphere, the ozone layer could form.  Without the ozone layer, no life could live above the water.
The atmosphere became oxygen rich and stabilized about 544 million years ago...the beginning of the Cambrian.

Modern Atmosphere

The atmosphere today contains __________________________________________.  
The majority of gas present in the atmosphere is ___________________ (about 78%)
The rest is trace gasses such as Carbon Dioxide, Neon, Helium, Methane and so on.
The atmosphere is broken down into 5 layers
1. ______________________
2. Stratosphere
3. ______________________
4. Thermosphere
5. ______________________
The Troposphere is _______________________________________________________.
The Troposphere extends to about ___________________________ (8 miles) up.
Commercial aircraft fly in the upper level of the Troposphere (35000 feet)
Military aircraft fly much higher and faster.
The Stratosphere extends from about ________________________________________.
The _____________________ _______________________ is located within the Stratosphere.
The Ozone layer is a layer of O molecules that filters out Ultra violet radiation.
Without the ozone layer, life could not exist on the surface of Earth.
Above the Stratosphere are the ___________________, Thermosphere and exosphere.
Within the Mesosphere and part of the Thermosphere is a layer of electrically charged particles that make up what is called the _________________________.
The Ionosphere is responsible for producing the brilliant Northern and Southern lights (____________________________________________________________)
The ionosphere also "bounces" radio waves all over the world.
At night AM (amplitude modulated) radio waves will travel great distances across the country.  
During the day, solar radiation ________________________________________.
AM radio waves then can be bounced all over the world.  HAM radio operators take advantage of this.
Because FM (frequency modulated) radio waves do not travel as well, FM radio is called a "__________________________________________" communication.
Cell phones use what is called UHF FM signals. (ultra high frequency, frequency modulated)
The thermosphere is an area where the temperature greatly "increases".  The molecules in the thermosphere are moving with a great deal of speed due to _________________
__________________________________________.
If you were able to stick your hand outside in the thermosphere, it would not feel "hot" because the molecules are so far apart.  (kind of like how the sparks from a sparkler do not really feel hot)
The temperature continues to increase as you get into the exosphere but the molecules are so far spread that you could not measure the temperature if you tried.
The ____________________ blends into space and is where the space shuttle flew.

Atmospheric Pressure

The pressure exerted on a body or object by the atmosphere.
We live under an ocean of air.  The atmosphere is much like water, it exerts pressure __________________________________________________.
At sea level, the pressure exerted by the atmosphere is right around ________ (pounds per square inch).
This is referred to as "______________________________________________".
So why do we not feel the pressure on us?
The reason is that the pressure within our bodies is the same as the pressure surrounding us.  There is __________________________________________________.
In 1654 a man by the name of Otto von Guicke, (burgomaster of Magdeburg Germany) invented _________________________________________________.
Otto placed two copper hemispheres about .5 meters in diameter together with a leather gasket between them.  Otto then used the vacuum pump to _______________________________________.  He challenged two teams of horses to pull the spheres apart.
What is holding the spheres together?
If you said a _________________, consider this...what is inside the sphere?
What is a "_________________________"?
A vacuum is defined as ___________________________, ______________________________________.
Is vacuum a force?
If there is no matter inside the sphere, how can nothing hold two spheres together?
Just as water has pressure the deeper you go, so does air.  
Unlike the density of water, the density of air ___________________________.
The pressure of the atmosphere is not uniform.  
Besides altitude variations, there are variations in atmospheric pressure at any one locality due to moving air currents and storms.
Changes in air pressure are used in the _________________________________.
Changes in air pressure can be used to predict storms and weather changes.
Air pressure is measured using a ____________________________
A simple ___________________________________ is made from a glass tube, longer than 76 centimeters and closed at one end, kind of like a long test tube.  
The tube is filled with ________________________ and then turned upside down in a pool of mercury.  The mercury in the tube will run out the bottom, into the pool until the level falls to about 76 centimeters.  The empty space at the top is a ______________________________________.  
Why does this happen?
Why doesn't the mercury run out the bottom of the test tube?
What is holding the mercury up in the tube?
__________________ __________________ is pushing down on the liquid mercury.  If atmospheric pressure increases, the mercury rises in the tube.  If pressure decreases, the mercury ________________.
If a barometer were to be made out of water, the glass tube would have to be _____________________________________.
What happens in a barometer is similar to what happens when you drink through a straw.  
You lower the pressure at one end and the atmosphere ______________ the liquid up the straw.
As long as you understand these ideas, you understand why there is a limit of 10.3 meters on the height water can be lifted with a vacuum pump.
Bernoulli's Principle, how airplanes fly.
Does air pressure increase in a hurricane, tornado or very strong wind?
If you answered "_____________" to the previous question, you are ___________________.
A strong wind may blow the roof off of your house, but the pressure within the wind is actually _________________________________________________________ density inside the house.
A Swiss scientist by the name of Daniel Bernoulli studied the relationship of fluid speed and pressure.  When a fluid flows through a narrow constriction, ___________________________
__________________________.  The fluid must speed up in the constricted region if the flow is to be continuous.
Bernoulli wondered where the fluid gets is extra speed.  He reasoned _______________________________________________________________________.
Bernoulli's principle states
"____________________________________________________________________________."
It is easy to confuse the difference between the pressure within a fluid and the pressure exerted by the fluid when it encounters anything in its path.

The water within a fire hose has relatively low pressure.  The water itself however can exert massive pressure upon anything in its way.

Sunday, March 5, 2017

Atmosphere Prezi for 7th Grade

Following is a link to the Prezi being used in the 7th Grade classes.  Atmosphere Prezi

Here is a link to the notes that are also being used.  Notes