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Introduction

Introduction. The purpose of this lab is to decide what happened during the crash between the 3000kg Cadillac Escalade SUV, and the 2000kg Subaru Outback Wagon. The Auto Expert, Collision Expert, and the Investigator worked hard to combine each others data in order to make this decision.

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Introduction

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Presentation Transcript

  1. Introduction The purpose of this lab is to decide what happened during the crash between the 3000kg Cadillac Escalade SUV, and the 2000kg Subaru Outback Wagon. The Auto Expert, Collision Expert, and the Investigator worked hard to combine each others data in order to make this decision. Juliana Czekala, Chloe Shepard, and Madison Gordon

  2. Auto Expert (Juliana Czekala) • I determined, based upon accident site analysis, how fast the SUV and wagon were moving immediately following the collision. By doing this, I was able to see if either of the cars were breaking any laws. • The SUV is the one that rear-ended the Wagon. • The SUV was moving, while the wagon was stopped at a stop sign in a 35mph speed zone. • The acceleration of a Subaru Outback Wagon with the brakes locked is -3 m/s2, and the acceleration of a Cadillac Escalade SUV with the brakes locked is -2 m/s2. • Calculations: • SUV: • 0 = Vi^2 + (2)(-2m/s^2)(2m) • -Vi^2 = (-8 m^2/s^2) • Vi^2 = the square root of 8 m^2/s^2 • Vi = 2.828427125 m/s • Wagon: • 0 = Vi^2 + (2)(-3 m/s^2)(24m) • 0 = Vi^2 + (-144 m/s^2 x m) • Vi^2 = 144 m^2/s^2 • Vi^2 = the square root of 144 m^2/s^2 • Vi = 12 • I concluded that the SUV was moving at 2.828427125 m/s and the wagon was moving at 12 m/s. 

  3. Collision Expert (Chloe Shepard). • *Momentum* The product of the object's mass and the object's velocity, is measured in kg m/s. • *Law of Conservation of Momentum* States that the momentum of any closed, isolated system does not change. • In this situation, because kinetic energy was less the collision, so the collision was an inelastic collision. • The equation I used was the mass of the SUV+0= mass of the SUV( Velocity of the SUV after collision)+ Mass of wagon( Velocity of wagon after the collision). • I used this equation to figure out the initial velocity of the SUV. • (3,000 Kg)(Initial velocity of the SUV)=(3,000 Kg)(2.83 m/s)+(2,000 Kg)(12 m/s) • = 10.83 m/s • Once I found this out I was able to conclude that the SUV was not going over the speed limint of 35 km/h when he hit the wagon.

  4. Investigator (Madison Gordon). • Elastic Collision: Kinetic energy before and after collision remain the same. • Inelastic Collision: Kinetic energy after collision is less than kinetic energy before collision. • I also had to use the equation 1/2 mv^2 for the SUV before the collision: • 1/2 (3000kg)(10.8m/s)^2 = 174960 • I then had to use the equation 1/2 mv^2 for the Wagon after the collision. • 1/2 (2000kg)(12m/s) = 144000 • Then the equation 1/2 mv^2 for the SUV after the collision. • 1/2 (3000kg)(2.83m/s) = 12013.35 • I then added the last to calculations together to see if they would equal the first equation. • 144000 + 12013.35 = 156013.35 • 156013.35 does not equal 174960. Therefore, the collision was inelastic.

  5. Conclusion • In conclusion after all of our research and investigation we concluded that the SUV did not break any laws in the accident. • We also figured out that the collision was indeed a inelastic collision.

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