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Agenda 04-01-2014

Agenda 04-01-2014 . Introduction Homework Activity 85: “Crash Testing”. Force and Deceleration (Negative Acceleration). F = m x a. Minor injury (passenger) Minor damage (vehicle). Greater injury (passenger) Greater damage (vehicle). F = m x a. Activity 85: Objective.

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Agenda 04-01-2014

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  1. Agenda 04-01-2014 Introduction Homework Activity 85: “Crash Testing”

  2. Force and Deceleration (Negative Acceleration) F = m x a Minor injury (passenger) Minor damage (vehicle) Greater injury (passenger) Greater damage (vehicle) F = m x a

  3. Activity 85: Objective Students will be able to: • Design a “crash-test dummy” based on their knowledge about the physics of collisions..

  4. Activity 85: Purpose Students will be able to: • Apply their knowledge about the physics of collisionsto real life situations and decision making.

  5. Homework • Analysis Question 1, Activity 85, p. E57 • Work on “Recycled Car” Project Note: Thursday April 3rd bring materials to work on your project.

  6. Activity 85: Crash Testing • Set up Activity 85, pp. E55-E57. • PRE-LAB: acceleration, engineer, force, crash dummy, sensor. • Read Introduction, p. E55.

  7. Crash Testing “A Dummy’s Business”

  8. Vehicle-Crash Tests • Used by automobile and safety engineers • To find out how well each kind of car keeps people safe in an accident.

  9. Importance of Crash Tests • Show whether the car meets government safety standards; • Help consumers evaluate and compare the safety of different kinds of cars.

  10. Standard Frontal or Front-End Crash Test The car travels down a track at 35 MPH and smashes into a barrier. http://www.youtube.com/watch?v=pG9h4XMJv6Y

  11. Standard Side-Impact Crash Test A barrier moving down a track at 31 MPH crashes into the side door of a stationary car. http://www.youtube.com/watch?v=vsyvhA-8QYs

  12. Rollover Testing • http://www.youtube.com/watch?v=Ah93KsfQdaU

  13. Crash-test Dummies • Life-sized dolls • Measure possible: • occupants’ movement during a crash, • injuries during crash. So engineers can design safer vehicles.

  14. The “50th-percentile Hybrid III” Family Represents people of different sizes and genders Mr. Hybrid III (made its first appearance in 1976) • 175 cm (5'9") tall and mass of 77 kg (170 lb) • He occupies the driver's seat in all the Insurance Institute for Highway Safety (IIHS) frontal crash tests • Has a "big brother", the 95th percentile Hybrid III, at 188 cm (6 ft 2 in) and 100 kg (223 lb) Ms. Hybrid III • The 5th percentile female dummy • 152 cm (5 ft) tall and 50 kg (110 lb) Three Hybrid III child dummies • A ten-year-old, 21 kg (47 lb) • A six-year-old • A three-year-old, 15 kg (33 lb) • The child models are very recent additions “50th-percentile Hybrid III” Family Vacation

  15. Dummy’s Body Parts Bones • made of steel and aluminum. Soft tissue • muscles, organs and skin made of vinyl and foam. Joints • made with different types of connectors (bolts).

  16. Dummy’s Sensors • Placed on various parts of dummy‘s anatomy • Record information about the impact during the test • Most common location • Head • Neck • Arms • Chest • Upper legs • Lower legs • Feet and ankles

  17. Activity 85: Crash Testing • Follow Procedure (p. E56), Steps 1-3, to design a car-crash dummy • For Step 4 you will prepare a colorful poster to present your team’s design, include: • Labels and explanations of the different parts • Materials you would use to make the dummy • Size and mass • Sensors • At least five sensors • Location (use an “X”) • What they should measure

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