Energy skate park (homework)
Due Date: May 19, 2010
Build-a-Park .you know like build-a-bear ..
You can submit electronically on classjump or print.
- Apply the properties of kinetic and potential energy
- Identify and describe the transfer of potential energy to kinetic energy
- Predict the role of friction
- Describe the effects of gravity
START THE SIMULATION: http://phet.colorado.edu/new/simulations/sims.php?sim=Energy_Skate_Park
Click on Run Now (Green button)
As the skate park opens on your screen, observe the movements of the skater in the half pipe.
1. Does the skater hit the same height on the opposite sides of the track? (Use the pause button and the measuring tape or turn on the grid to help you determine this!)
Now, turn on the energy Pie Chart, Energy vs. Position Graph, and Bar Graph. (You may need to move things around a little to see everything.)
2. On all three visual aids, what color represents potential energy and which is kinetic energy?
3. When does the skater have the highest amount of kinetic energy? Potential energy? When does the skater have the lowest amount of kinetic energy? Potential energy?
4. Describe how the bar graph changes as the skater moves along the track (i.e. what happens when the skater is high on the track? Low on the track?).
5. Explain which visual aid (the pie, energy vs. position, or bar graph) helps you understand conservation of energy better, and why.
You just hired to design a skate park for your community. Your park needs to be fun and exciting, yet safe. There should be at least 3 different features in your park. You can open different tracks by using the track drop down menu in the top left. The challenge is to ensure your features are safe, and that your skaters will not fly off the ramps. Make sure you have friction turned on, as there is friction in the real-world. (Put on the second line in from the none side).
Have fun designing!!!
1. Sketch your new park:
2. Identify 3 variables or factors you had to consider when making your features?
3. On your sketch in number 1, label all the points of maximum kinetic energy in red, and all points of minimum kinetic energy in blue.
4. On your sketch in number 1, label all the points of maximum potential energy in green and minimum potential energy in orange.
5. How does the potential energy relate to the kinetic energy at these points you labeled?
6. Also on your sketch, label all points where kinetic energy is exactly equal to potential energy in pink.
Now lets make some adjustments to your park:
7. Predict what do you think would happen if you took friction off?
8. Try it, and record what happened.
9. Would this park be more or less safe on the moon? Why?
10. Would this park be more or less safe on Jupiter? Why?
12. Make an advertisement for your park. Ideas/things to include:
-Why should people come?
- Why is it better than others?
- What features does it have?
- Who should come skate there? (age, weight, ability level)
JFF Just for fun
1. See if you can have the skater do two loops. Draw your track.
2. See if you can have the skater go airborne, but land on another track.
3. See if you can have the skater say cow-a-bunga.
4. See how many times you can get a skateboarder to go around a loop. Shoot for infinite. (Hint: think about gravity and friction)
Answer the acid rain background questions electronically and post them to classjump.
Look at the lab sheet and come up with a proposal for study for tuesday.
What is acid rain?
What chemicals make rain acidic, and how does it happen?
Where do these chemical come from?
How do we measure the acidity of rain?
What is ph?
Describe the ph range and list various things that correspond to the various ph levels.
What is the ph of normal rain, and at what level does the ph become dangerous?
What effect does acid rain have on trees and soil?
How does the effect of acid rain on trees and soil affect us?
What happens when lakes and aquatic systems become acidic?
How does acidic water systems affect us?
Are the acquatic systems in our area being affected by acid rain? If yes, to what extent?
What are the danger signs of the effect of acid rain on aquatic systems?
How does acid rain affect humans?
What are some of the direct effects of acid rain on humans? Are there any health problems associated with acid rain?
What are some of the indirect effects of acid rain on humans? Does acid rain affect our sources of food, water, and air.
What are the consequences of the effects of acid rain on people?
Does acid rain affect building materials? Look at the list of building materials provided for the lab and find sources that talk about each.
Does acid rain have an effect on architecture?
What does acid rain do to our roads, highways, and bridges?
What is the effect of acid rain on things made from metal such as automobiles, trains, buses, and other means of transportation?
What does the effect of acid rain cost us in terms of money?
What are the economic consequences of acid rain on fisheries, forestry, and agriculture?
Acid Rain US EPA
Acid Rain Students Site Home grades 4-6, but a good simple starting point.
Acid rain's effect on plants and wildlife
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Water/FreshWater/acidrain.html - building materials description down the page
Acid rain is a major environmental issue throughout Connecticut and much of the United States. Acid rain occurs when pollutants, such as sulfur dioxide from coal burning power plants and nitrogen oxides from car exhaust, combine with the moisture in the atmosphere to create sulfuric and nitric acids. Precipitation with a pH of 5.5 or lower is considered acid rain.
Acid rain not only affects wildlife in rivers and lakes but also does tremendous damage to buildings and monuments made of stone. Millions of dollars are spent annually on cleaning and renovating these structures because of acid rain.
Your town council is commissioning a new statue to be displayed downtown. You and your lab partner will conduct an experiment to investigate the effect of acid rain on various building materials in order to make a recommendation to the town council as to the best material to use for the statue. In your experiment, vinegar will simulate acid rain.
You have been provided with the following materials and equipment. It may not be necessary to use all of the equipment that has been provided.
Proposed building materials:
containers with lids limestone chips
graduated cylinder marble chips
vinegar (simulates acid rain) red sandstone chips
pH paper/meter pea stone
safety goggles access to a balance
Designing and Conducting Your Experiment
1. In your words, state the problem you are going to investigate. Write a hypothesis using an If then because statement that describes what you expect to find and why. Include a clear identification of the independent and dependent variables that will be studied.
2. Design an experiment to solve the problem. Your experimental design should match the statement of the problem and should be clearly described so that someone else could easily replicate your experiment. Include a control if appropriate and state which variables need to be held constant.
3. Review your design with your teacher before you begin your experiment.
4. Conduct your experiment. While conducting your experiment, take notes and organize your data into tables.
Safety note: Students must wear approved safety goggles and follow all safety instructions.
When you have finished, your teacher will give you instructions for cleanup procedures, including proper disposal of all materials.
Communicating Your Findings
Working on your own, summarize your investigation in a laboratory report that includes the following:
A statement of the problem you investigated. A hypothesis (If ... then because statement) that described what you expected to find and why. Include a clear identification of the independent and dependent variables.
A description of the experiment you carried out. Your description should be clear and complete enough so that someone could easily replicate your experiment.
Data from your experiment. Your data should be organized into tables, charts and/or graphs as appropriate.
Your conclusions from the experiment. Your conclusions should be fully supported by your data and address your hypothesis.
Discuss the reliability of your data and any factors that contribute to a lack of validity of your conclusions. Also, include ways that your experiment could be improved if you were to do it again.
Notebook check (homework)
Due Date: March 31, 2010
projects are still due March 31, 2010
If you do not have contact info for your group, you can use the message board(at the top of the page) to discuss the project. I will be at school from 12-3 today. If anyone is needing help and wants to show up from 12-3 email me and let me know you are coming.
Have your ideas and experimental deisign ready so that I can approve them.
Mystery October 15, 2009
Here is where we left at the end of class. The 3 (Al, Ike and Archie) were caught Blue, green and Red handed respectively. You were allowed to start the process of determining who is guilty. You will be given 10 minutes to finish this at the start of Monday's class. You will then be required to prosecute the criminal.
Bonus - figure out who they are.
Archie is much older than Ike who is much older than Al. The police ran DNA samples and only Al is in the system. He is from Austria originally and none of the police can believe the DNA analysis. Even though the other 2 are not in the DNA data base, there is some information that could be determined. Ike is British and Archie is Greek.
The idea for the 3 came to me when my son was watching Bill and Ted's excellent adventure last weekend.
Density packet (homework)
Due Date: October 13, 2009
Chapter 2 packet (homework)
Due Date: October 5, 2009
Homework packet given out in class
Coloring October 1, 2009
Answer the questions on mixtures and color the sheet.
lab report due (homework)
Due Date: September 29, 2009
Your lab report is due. It can be handed in or posted by today
Questions on pages 44 and 51 (homework)
Due Date: September 24, 2009
Lab report (homework)
Due Date: September 18, 2009
Please use the lab report format to start a rough draft of a lab. Please bring books on 9/18.
In class on Friday September 18, 2009
Use the computer time to write your rough draft of the lab report. When you are done save the document on Classjump. If you have extra time, complete the bookwork.
quiz today September 14, 2009
The pictures may not show up on this practice test, but at least you have an idea of what the questions will be like. After you have answered all questions, the button on the bottom left will give you your score and the correct answers. Good Luck