RACE CARS (Compressed Air Cars)

1. RACECARS (Compressed Air Cars) 8th Grade Ind. Tech Miss Check

2. Table of Contents Unit 1- Understand the Problem Unit 2- Gather Information Unit 3-Develop Solutions Unit 4-Implement a Solution Unit 5-Test and Evaluate Unit 6-Redesign and Communicate

3. Unit 5- Test And Evaluate In this activity you will: --Test the weight and alignment of your solution for the CO2 Race Car Design project. --Race your prototype car. --Evaluate your solution.

4. Measuring Weight Measurement is using numbers to describe something. People measure things to learn more about them. And they measure to compare one thing to another. One type of measurement is weight. Weight is how heavy an object is. It is the measure of how much of Earth’s gravity pulls down on an object.

5. How To Measure Weight Use a scale or balance to measure weight. Some scales automatically calculate weight. To use an automatic scale, set the object to be weighed on the scale. Read the weight.

6. How To Measure Weight (contin.) To use a balance scale, use the following steps: -Set the balance to zero by sliding all riders back to the zero point. -Check the pointer on the right to make sure that it swings an equal distance above and below. -If the swing is not equal, find and turn the adjusting screw until the swing is equal. -Set the object to be weighed on the balance pan. -Slide the rider with the largest mass along its beam until the pointer drops below zero. -Move the rider back notch by notch until the pointer rests at or above the zero point. -If needed, move the other riders along the beam until the pointer lines up at the zero point. -Then total the number of masses on each beam to find the mass of the object.

7. Two Systems There are basically two standard systems to communicate measurement- the English system and the metric system. The metric system is used in most of the world. This system uses the milligram, gram, kilogram, and metric ton to measure weight. In the metric system, everything is based on the number 10. The English system is used mainly in the United States. This system uses the ounce, pound, and ton to measure weight. 1 ounce 16 ounces = 1 pound 2000 pounds = 1 ton 1 milligram 1000 milligrams=1 grams 1000grams= 1 kilogram 1000 kilograms=1 metric ton

8. Complete Questions Numbered One And Two

9. Summary Measurement is using numbers to describe something. People measure things to learn more about them. And they measure to compare one thing to another. Weight is how heavy an object is. It is the measure of how much Earth’s gravity pulls down on an object. Use a scale or a balance to measure weight. Some scales automatically calculate weight.

10. Weight The Car DO: Get the Form 5-1: Test and Evaluate. DO: Take turns weighing each fully assembled car. DO: Write each student’s name, the car name, and the car weight on your form.

11. Test the Car Recall that you checked the wheels and axles. You made sure they had good rolling friction. Now, you can test the rolling friction. If a car’s wheels and axles are not aligned, or line up straight, they will cause additional friction. DO: At the test area, hold the car launcher stand firmly on the floor. DO: Place the end of the plunger at the rear of your car. DO: Pull the launch arm back to its furthest point and then release it. DO: Measure how far the car veers off the middle line. DO: On the test and evaluate form, write the measure of how far the car veered to the side under Alignment. 90 degrees

12. Complete Questions Numbered Three Through Five

13. Race The Car Each student will race a prototype race car. Before each student races, write each student’s name and car name on the test and evaluate form. After the race, record the race time on the form. Make sure to document all of the race times.

14. Complete Questions Numbered Six Through Eight

15. System Model A system is a combination of parts that work together to achieve a desired goal. Systems can be simple or complex, small or large. Examples of technology systems are a plow, a space shuttle, a personal computer, and an automobile plant.

16. Complete Question Number Nine

17. System Model A system model is used to better understand how a system works. A system model has inputs, resources, processes, outputs, and feedback. Resources Outputs Inputs Processes Feedback

18. Systems Model Glossary Resources- Resources are what is available to produce the outputs. Resources include people, information, materials, tools and machines, energy, capital (money), and time. (Coal, people to mine the coal, tools needed to mine the coal, money to pay workers, etc.) Inputs- Inputs define the system, its components, and its method of operation. (How coal is used to make electricity through a generator)

19. Systems Model Glossary Processes- Processes combine the inputs and resources to produce the outputs. (Coal + Generator = Electricity) Outputs- Outputs are the measurable results. (Watts of electricity) Feedback- Feedback is information about the outputs. Feedback can be used to adjust the inputs to produce more desirable outputs. (Electricity Bill)

20. Complete Question Number Ten

21. Evaluate the System DO: Get Form 5-2: System Evaluation. DO: Under Inputs, list the inputs that went into your car. (car parts) DO: Under Resources, list the people, information, materials, tools and machines, energy, capital, and time that were involved. DO: Under Process, list the steps you used to create your car. (6) DO: Under Outputs, list the measurable results. DO: Under Feedback, list the information you learned.

22. Congratulations! You have completed Unit 5- Test and Evaluate. You will now move onto Unit 6. The power point is titled “Unit 6 – Redesign and Communicate”.