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Tuesday, November 25, 2014

Monday, November 17, 2014

Lab #3 – Calculating Work

Lab #3 – Calculating Work

Work = Force x distance
Work = (Force)(Distance)
W = Fd

Problem
How can a ramp help us pull a heavy object up to a greater height?

Hypothesis
Skip 3 lines here

Materials
Ruler, chair, ramp (inclined plane), weights, spring scale, various metallic objects








Procedure

Results
A.Work done without ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight
__N
__cm
___J
50 g Weight



100 g Weight



200 g Weight



500 g Weight



 Metal Object








B. Work done with ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight
 N
cm 
50 g Weight



100 g Weight



200 g Weight



500 g Weight



Metal Object











Make another Hypothesis: Use your hands to feel the wool blanket and the plastic maps.  Which of these will cause more work to be done on the weights? 

C.Work done with plastic map and ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight



50 g Weight



100 g Weight



200 g Weight



500 g Weight



Metal Object





D.Work done with wool blanket and ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight



50 g Weight



100 g Weight



200 g Weight



500 g Weight



Metal Object





ANALYSIS
1)   Construct a line graph for results A, B, and C on the same coordinate plane.  Label the x-axis weights (grams) and label the y-axis work (Joules). 
2)   How did the weight (force pulling down) affect the amount of work done on the object?
3)   Compare/Contrast the trial with the least amount of work to that with the most amount of work.
4)   Part 1 (A,B): What is your Independent Variable?
5)   Part 1 (A,B): What is your Dependent Variable?
6)   Part 1 (A,B): What are your Constants?
7)   Part 2 (B,C): What is your Independent Variable?
8)   Part 2 (B,C): What is your Dependent Variable?
9)   Part 2 (B,C): What are you Constants?

10)               Make an inference: Which would increase the friction of the object you are pulling, adding oil to the ramp or glue?  Why would you expect this?


Conclusion

 What was your problem?
 Restate your hypothesis.  Was it right? wrong?  why or why not?
 What did you learn in this lab?
 What did you like about this lab?
 What were some challenges you had to deal with?
 What could you do next with this problem?  What other tests could you perform?
 Write down any other additional thoughts, observations, inferences, etc.

Tuesday, November 4, 2014

Chapter 2 Review


Energy transforms...

from www.dictionary.com:
energy  (ěn'ər-jē) Pronunciation Key
The capacity or power to do work, such as the capacity to movean object (of a given mass) by the application of force. Energycan exist in a variety of forms, such as electrical, mechanical,chemical, thermal, or nuclear, and can be transformed from oneform to another. It is measured by the amount of work done,usually in joules or watts.
 A. Types of Energy:
     1) Potential Energy is the energy of position.  An object's mass andheight give an object its potential energy.  The greater the mass or the higher an object is, the more P.E. an object has.
  Potential Energy = (mass)(gravity)(height) or P.E. = mgh

     2) Kinetic Energy is the energy of movement, motion.   An object's massand speed/velocity determine its kinetic energy.  The greater the mass and the more speed an object has, the more K.E. an object has. 
Kinetic Energy = 1/2(mass)(velocity)(velocity) or K.E. = 1/2 mv2     




B. Forms of Energy
Energy can come in a variety of forms.

1. Atomic/Nuclear Energy is produced when you split atoms. 
Examples:Atomic bombs, nuclear power plants, and the sun.




2. Chemical Energy - is really a form of potential energy and is the energy stored in food, gasoline or chemical bonds.
Examples: Striking a match, food, batteries.  


3.  Electrical Energy - Energy produced by electrons moving through a substance is known as electrical energy. We see evidence of electricity in household appliances, electric outlets, phone chargers, electric wires.
Examples: MP3 players, computers, video games, holiday light wires.


4. Mechanical Energy - is the energy of movement. All moving objects have mechanical energy. Examples: bicycles, machine parts, subway trains, wheels, us!
M.E. = P.E. + K.E.
  

5. Sound Energy- is produced when a solid, liquid or gas vibrates. Sound energy travels out as waves in all directions.
Examples: Voices, sirens, horns and musical instruments.





 6. Radiant Energy - is light energy, that when absorbed by an object, gets converted to thermal/heat energy. 
 Examples: A light bulb, the glowing coils on a toaster, the sun, and even headlights on cars. 




7. Thermal Energy - is the energy of molecular movement.  The faster the molecules move, the more thermal energy is present.  Heat is the transfer of thermal energy i.e. when thermal energy moves from object to object, we feel it as heat.




C. Generating Electricity!!!
- Electrical energy is needed in our daily lives.  Imagine what life would be like if all those appliances that you plug in on a daily basis were to disappear...   No refrigerators, no MP3s, no television, no hot water, etc.

Power plants use a generator to generate electricity.  A turbine turns the generator.  Mechanical energy is needed to turn the turbine, usually in the form of steam pushing against its blades.  Now, all we need is a source of thermal energy to boil the water into a gas.
  


Tuesday, October 28, 2014

*** Energy Bonus Project ***

*** Energy Bonus Project ***

1. You are going to complete a Science Project/Demo/Experiment at home.

2. Use the Scientific Method, like we use in class, as a guide for your project.
a. Title
b. Problem
c. Hypothesis
d. Materials
e. Procedure
f. Results
g. Analysis (Independent Variable, Dependent Variable, Constants)
h. Conclusion

3. Do your project on a display board, power point, MS Word Document, or written NEATLY on loose-leaf paper.

4. Include pictures of your project and pictures of yourself working on it.

5. This is a solo project; we will work on other projects with partners in the future.

I suggest using the following website.
http://www.energyquest.ca.gov/projects/index.html

Here are some additional websites to find projects:
 http://www.sciencebuddies.org/science-fair-projects/recommender_interest_area.php?ia=Energy&d=all&p=1

http://www.pinterest.com/stevespangler/fall-halloween-science/

http://kidsactivitiesblog.com/60117/halloween-home-science

http://chemistry.about.com/od/halloweenchemistry/a/halloweensci.htm

http://www.sciencebob.com/blog/?p=360

http://www.babble.com/crafts-activities/spooky-science-10-experiments-for-halloween/


If you need any help, please come to room 407 after school. 

**Due Date 11/5/14**

- Mr.Considine

Friday, October 24, 2014

Potential Energy vs. Kinetic Energy
*Task*
You have seen many examples of PE/KE.  Your task is to create your own illustration of Potential and Kinetic Energy in action. 

Your illustration must include the following: Maximum KE, Minimum KE, Maximum PE, Minimum PE, Increasing KE, Decreasing KE, Increasing PE, Decreasing PE
*Include an explanation for each label*