Note: The directions on this page reflect the Car Project (PBL) in reverse chronological order.

PART 3: DIRECTIONS FOR TURNING IN YOUR CAR PORTFOLIO
Regardless of how you turn it in, you must have it in your teacher's possession by Thursday, October 18.

Option A: Dropping it in your teacher's dropbox (can be done at school, but not from home)
1. Rename your project your first and last name
- Click once on the original title on the icon of your project.
- When the title is highlighted, delete the original title and type in your first and last name.
2. Open the "Share" icon on your desktop.
- Find the KMS folder.
- Find your science teacher's name (either carpenter_toby or sparks_meghan) and open it.
- The only folder in the teacher's folder will be "Dropbox."
- Drag your recently renamed project into the "Dropbox" folder.
- You will be shown a message that reminds you that you will not be able to access the project any longer. Click "Continue" or "OK."
3. Confirm that it is turned in with your teacher before the end of the class period on Thursday, 10/18.

Option B: Email your project to your teacher (can be done from home or from school)
1. Rename your project your first and last name
- Click once on the original title on the icon of your project.
- When the title is highlighted, delete the original title and type in your first and last name.
2. Open a new email.
- Add your recently renamed project as an attachment/enclosure
- Send your message to your teacher: carpenter_toby@dublinschools.net or sparks_meghan@dublinschools.net
3. Confirm that it is turned in with your teacher before the end of the class period on Thursday, 10/18.

Option C: Hand your portfolio to your teacher
1. Ensure your first and last names are on your project in a very obvious place.
2. Hand it directly to your teacher before the end of the class period on Thursday, 10/18.

Balloon Car Information

Mousetrap Car Information

Directions for Creating a Car Graph on Excel:


Car Data For Graphing:**
1st period
Time (s)
Distance (m)
Mean
16.93
10.3
Median
15.63
10
Mode
15.63
10

2nd period
Time (s)
Distance (m)
Mean
9.1
10.7
Median
10
10
Mode
10
10

5th period
Time (s)
Distance (m)
Mean
10.7
8.5
Median
11.1
10
Mode
12.5
10

6th period
Time (s)
Distance (m)
Mean
15.2
11.3
Median
12.5
10
Mode
10
10

7th period
Time (s)
Distance (m)
Mean
14.6
11.8
Median
10
10
Mode
10
10

PART 2: YOUR CAR PORTFOLIO!


Ultimately, I need evidence proving that you know and understand the physics content we cover in class. For this unit, some of that evidence will come from your CAR PORTFOLIO. This portfolio can be electronic (like a powerpoint, prezi, keynote, etc.) or an actual, tangible portfolio. Either way, each individual student will submit their portfolio containing proof of knowledge of each of the following statements… these will be applied to the motion of the cars we build in class.

Each entry must contain a written response as well as pictures or some sort of visual supporting your responses. All of the information you provide on each entry must prove that you completely understand how each of the listed indicators is demonstrated in your car. Students are encouraged to take pictures of their cars during the building stages to use in the portfolio.

Energy - Draft of this entry due September 10
Indicators:
• Describe how an object can have potential energy due to its position or chemical composition and can have kinetic energy due to its motion.
• Explain how energy can change forms but the total amount of energy remains constant.
• Trace energy transformation in a simple closed system.

How will you show you know those indicators?
--> Key Idea... Relate your car to the following five concepts: (1) Potential energy, (2) Kinetic energy, (3) Dissipated energy, (4) Transfer of energy, (5) Law of conservation of energy. Not sure what those terms mean? Check them out on our Quizlet set

Motion - Draft of this entry due September 14
Indicator:
• Describe how the change in position (motion) of an object is always judged and described in comparison to a reference point.

How will you show you know that indicator?
--> Key Idea... How do you know if you car moves (or doesn't)? Use the term reference point (what is the reference point for a race car?) in your entry.

Forces - Draft of this entry due September 21
Indicator:
• Explain that an unbalanced force acting on an object changes that object's speed and/or direction.

How will you show you know that indicator?
--> Key Ideas... (1) Name at least four forces acting on your car as it moves. (2) Explain how your car demonstrates balanced and unbalanced forces. (3) Make sure to include which of the forces is the strongest (when unbalanced) and how that affects the motion of the car at the beginning and at the end of its "race."

Speed - Draft of this entry due October 5
Indicators:
• Explain that motion describes the change in the position of an object (characterized by a speed and direction) as time changes.
• Include a distance vs. time graph of your car's speed compared to some of the others in class (more information will come during class about how to create this on Excel)

How will you show you know those indicators?
--> Key Ideas... (1) Calculate the speed of your car. Show how you got the average speed. (2) Include your Excel graph (we'll do these in class) and analyze the graph (your car's motion compared to the others on the graph). (3) Connect the change in speed of your car (speeds up at the beginning, slows down at the end) relates to either the forces acting on your can or the energy your car demonstrates.

Design - Draft of this entry due October 10
Indicators:
• Design and build a product or create a solution to a problem given more than two constraints (e.g., limits of cost and time for design and production, supply of materials and environmental effects).
• Evaluate the overall effectiveness of a product design or solution.

How will you show you know those indicators?
--> Key Ideas... (1) Describe the process you went through to design your final car. (2) Identify the issues you experienced when building your car and how you either solved them or attempted to solve them. (3) Include advice you'd offer someone taking on this challenge or something you wish you had thought of and would do differently if you had to build another car.

Vocabulary within Portfolio
There are some key vocabulary terms that must be included somewhere in the portfolio. Remember to check the Unit Vocabulary Quizlet for definitions of terms you don't quite know (yet!).
Dissipated EnergyScreen shot 2012-08-10 at 10.08.38 AM.png
Distance
Force
Friction or
Air Resistance
Gravity
Kinetic Energy
Law of Conservation of Energy
Motion
Potential Energy
Reference Point
Speed
Time
Unbalanced Force

Initial draft of final portfolio is due on October 16. We will peer review this draft in class. Final submission of the car portfolio is due October 18.


PART 1: BUILDING A WINNING DESIGN

Your next challenge in 8th grade science is to build a car… You and your group (if you choose to work with a group) will build one kind of car – either one powered by a balloon or one powered by a mousetrap. Regardless of the kind of car you choose to build, there are certain “rules” you must follow.

Screen shot 2012-08-10 at 10.00.56 AM.pngAll Cars Must…
• Have two axles (axles are what hold wheels in place);
• Use wheels that were not originally designed to be a wheel;
• Remain on the ground during its entire trip.

Balloon-Powered Cars Must…
• Be powered by 1-2 balloons only;
• Travel a distance of 3 meters.
...Here is a link to a Balloon Car Video

OR

Mousetrap-Powered Cars Must…
• Be powered by a “standard” mousetrap only;
• Travel a distance of 10 meters.
...Here is a link to a Mousetrap Car Video

Tentatively cars are due, ready to race, on October 2.

Note… if you have trouble getting your car to move the required distance, you will not fail this portion of the project. Even if it doesn’t move at all, you will still earn a 24/30 (80% B-). When combined with all of the other aspects of the project, there is plenty of opportunity to increase your overall grade on this project.

Here is how you will be graded on the construction of your car. It is worth 30 points total:
Screen shot 2012-08-17 at 6.39.46 PM.png
We will be using your cars to demonstrate several of the physical science concepts we are learning about... motion, speed, forces...


Here is a calendar of upcoming due dates for the car project:

Screen shot 2012-09-06 at 12.56.37 PM.png



Screen shot 2012-09-06 at 12.57.03 PM.png