Student Exploration: Crumple Zones 2021 -ALL ANSWERS CORRECT-GRADED A

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Vocabulary: acceleration, airbag, collision avoidance system, crash test dummy, crumple zone, force, kinetic energy, Newton’s laws of motion, safety cell, seat belt, work, work-energy theorem Prio... r Knowledge Questions (Do these BEFORE using the Gizmo.) Two burglars run down an alley at night, trying to escape the cops. Jack is carrying a rigid metal safe. Jill is carrying an armful of antique quilts. In the pitch dark, they both collide headlong into a concrete wall. 1. Who do you think will be hurt more in the collision, and why? Jack because F=ma so the bigger the mass is the bigger the force in which the impact will occur. 2. During a car crash, what features of the car might act like either Jack’s safe or Jill’s quilts? The weight of the car and all of it posterior structure is going to be Jack’s safe and Jill’s quilts is going to be the air bags. Gizmo Warm-up When cars were first invented, the safety of passengers was not a great concern. As vehicles grew larger and faster, accidents became more deadly. Safety features went from being a rare luxury to a legal requirement. In the Crumple Zones Gizmo, you will design cars that will help a crash test dummy survive a collision. 1. To begin, do not make any changes to the DESIGN tab of the Gizmo. Select the CRASH TEST tab, and click Play ( ). After the crash, click Slo-mo replay. What happens? Slo-mo replay shows what’s happening to the dummy and the car when it crashes. 2. Select the RESULTS tab to read about the results of the crash. Do you think a passenger would have survived this car crash? Explain. He wouldn’t survive because he decelerate2019 much faster than the car did and max force was a lot, therefore he would’t survive due to trauma to head and torso because it would hit its head very hard against the steering wheel. Activity A: Surviving a crash Get the Gizmo ready:  Click Reset ( ).  On the DESIGN tab, check that Sedan is selected. Introduction: Modern vehicles contain features designed to keep passengers safe in a crash. The crumple zone in the front of the car slows the car gradually and increases stopping time. The safety cell is a rigid cage that prevents passengers from being crushed. Inside, seat belts and airbags prevent the driver from hitting the windshield, steering wheel, or dashboard. Question: How does a crumple zone help protect a passenger? 1. Make a hypothesis: On the DESIGN tab, look at the parameters you can control. What settings do you think will make the safest car? Set up the Gizmo, and then fill in below. Crumple zone length: 120cm Crumple zone rigidity: 200kN Safety cell rigidity: 4000kN Seat belt present? Yes, If present, seat belt stiffness: 75kN/m Air bag present? Yes, If present, air bag rigidity: 40kN 2. Test: On the CRASH TEST tab, check that the Car 1 speed is 16 m/s, or about 35 miles per hour (mph). Click Play. After the crash, select the RESULTS tab. A. By what percentage did the crumple zone deform? 100% Safety cell? 2% B. Did the dummy hit the steering wheel? No C. What was the maximum force on the dummy? 17.29kN D. How likely was the dummy to survive? 100% In this simulation, forces are measured in kilonewtons (kN). One kilonewton is equal to 1000 newtons, or the force of a 225 [Show More]

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