8 th and 7 th Grade Design and Analysis Packet

Transcription

1 Name: 8 th and 7 th Grade Packet Part 1: Rubric (1 page, use this page) Here is a guide to the grading of your project. Refer to it often! This will be the Front Cover of your Packet. Grade: Creativity and Design Reliability and Performance Packet: Part 2 Research (due Friday, February 27 th, 2015) Packet: Part 3 Design and Calculations (due Friday, February 27 th, 2015) Packet: Part 4 Pre-Test and Analysis (due Friday, February 27 th, 2015) Name Mousetrap car appears well constructed AND shows evidence of detailed work, craftsmanship, innovation WOW! Should we patent Mousetrap car appears Mousetrap car appears well poorly constructed or constructed Parts are well slipshod. Parts are a chosen and integrated kludge but somehow manage effectively. to work together. this? Mousetrap car moves at least 2m powered only by the mousetrap(s). No throwing, pushing, or slingshot method Mousetrap car is invisible or non-existent Mousetrap car moves at least Mousetrap car moves at least 1m powered only by the 10cm powered only by the mousetrap(s). No throwing, mousetrap(s). No throwing, pushing, or slingshot method pushing, or slingshot method All designs have 3 Pros and 3 Cons. Pictures and captions for each of 3 designs. Complete and clear explanation on choice of Most of Research section complete, accurate, and clear. Less than half of Research section complete, accurate, and clear. Mousetrap car does not move. Design packet not handed in. design. 30 Complete materials list, all calculations are accurate and Most of Design and Less than half of Design and show work. Explanation Calculations section Calculations section Design packet not handed in. paragraph is clear on simple complete, accurate, and clear. complete, accurate, and clear. machines Data and Calculations are accurate and show work. Most of Pre-Test and Analysis section is accurate and work is partially shown. Less than half of Pre-test and Analysis section is accurate and work is not shown. Design packet not handed in Name on mousetrap car and design packet No name on mousetrap car or design packet Three neatly drawn scale drawings (top, side, front) BONUS/PENALTY: showing scale key, title; Using a kit consistent with mousetrap car Total 200 Total with Bonus 220

2 Part 1b: Design Parameters 1) The car must be powered by one or two Victor brand mousetraps (1 ¾ x 7/8 ). Other brands may be used by they must be of the defined size. (No Rat traps) 2) Cars should be primarily made out of objects found around the house. Apart from the mousetrap, no materials need to be purchased. 3) The mousetrap cannot be physically altered except for the following: 4 holes can be drilled only to mount the mousetrap to the frame and the locking mechanism can be removed. 4) By definition, a vehicle is a device with wheels or runners used to carry something. Therefore, launching a ball from the mousetrap will be ruled illegal. 5) Vehicles must be self-starting. Vehicles may not receive a push in the forward direction or side direction. 6) The vehicle must steer itself. 7) Distance will be measured from the front of the starting line where the front of the car will line up on to the front of the car after it has stopped. 8) Racers cannot receive a running start. 9) The racing officials (Mrs. Rooney and Mr. Dalzell) have the final decision as to the appropriateness of any additional items that might be used in the construction of the car. Please check before adding. Part 2: Research (1 page) A) Research at least 3 distinctly different mousetrap car designs (at a quick glance, the designs are different enough to notice). B) For each of the three designs: Provide a picture and a one-sentence caption describing the design. List (in bullet points or complete sentences) three Pros and three Cons of the design. C) Below your three designs, determine which design will be your base design. Your base design is the starting point of your design or the one most similar to your design. State in 1 brief paragraph (4-5 sentences) why you chose this design.

3 Part 3: Design and Design Calculations (1 page) A) First, provide a list of materials (bullet points) used in the construction of YOUR mousetrap. B) Measure the Wheel and Axle diameters in centimeters. Round to the nearest tenth of a centimeter (millimeter). C) Calculate the Ideal Mechanical Advantage of the Wheel and Axle you are using. Show the initial formula/equation used (with descriptions), the formula/equation with your wheel and axle measurements in it, and finally the Ideal Mechanical Advantage (rounded to nearest hundredth). D) Calculate the Ideal Force Output. Show the initial formula/equation used (with descriptions), the formula/equation with your calculated values included, and finally the Ideal Force Output. E) Calculate the Ideal Distance traveled while force is being applied. This is based on the length of string and circumferences of your wheel and axle. Show the initial formula/equation used (with descriptions), the formula/equation with your calculated values included, and finally the Ideal Distance while force is applied. F) Describe in 1 brief paragraph (4-5 sentences) why using a simple machine (wheel and axle) with a Mechanical Advantage greater than 1 is important for the Mousetrap car to travel larger distances. Hint: include friction and traction. Example of what is expected for C, D, and E: Let IMA = Ideal Mechanical Advantage (diameter of wheel) IMA= (diameter of axle) =(15.6cm) (1.5cm) =10.4

4 Part 4: Pre-Test and Analysis (1 page, use this page) For the Trials, pick one distance in meters (therefore, the distance column should be the same for all three trials). Measure out the distance and mark your start and end lines. Time how long it takes your car to travel the distance (to the nearest hundredth of a second). Note: any computer with internet access or any smartphone can work as a stopwatch. Calculate the average speed (round to nearest hundredth of m/s) for each trial. Once all trials are finished, Calculate the Mean Average Speed of the three trial average speeds (round to nearest hundredth of m/s). Based on the Mean Average Speed, calculate how much time your car will take to travel 2 meters. This is your Expected Time based on Mean Average Speed. Trial 1 Distance (m) Time (s) Average Speed (m/s) Trial 2 Trial 3 Mean Average Speed (m/s) Expected Time based on Mean Average Speed (s) Give example calculations for: Average Speed, Mean Average Speed, and Expected Time below.

5 Part 5: Extra Credit (optional) To earn the extra credit, you must draw on graph paper three scale drawings of your car. It should include a Top, a Side, and a Front view. It can be in either Customary or Metric units. It must include three accurate and neat drawings on graph paper (use a ruler), the measurements, and a scale (the same scale must be used for all drawings. The drawings must be accurate so that a person can recreate the car based solely on the drawings and materials list. Graph paper can be found here: If you need a refresher on how to draw Top, Side, and Front scale drawings, look here: or try googling or finding on youtube another resource. Part 6: Final Thoughts and Advice In your Packet, you must have: Page 1: Part 1- Rubric (use attached page) Page 2: Part 2- Research (your own page, typed) Page 3: Part 3- Design and Design Calculations (your own page, typed. Formulas and calculations can be neatly written instead) Page 4: Part 4- Pretest and Analysis (use attached page) Pages 5-7: Extra Credit scale drawings (optional) Leave room for error. Your design may not work exactly the way you want to begin with. Try changing one thing around at a time and see how that affects the outcome. And finally, some inspiration from Thomas Edison: Many of life's failures are people who did not realize how close they were to success when they gave up. - Thomas A. Edison