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Types of Collisions

Elastic Collisions Inelastic Collisions. Types of Collisions. In a closed system, the total momentum of all objects in the system will remain constant In other words…the total momentum in the system right before an “event” will be equal to the total momentum right after the “event”.

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Types of Collisions

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  1. Elastic Collisions Inelastic Collisions Types of Collisions

  2. In a closed system, the total momentum of all objects in the system will remain constant In other words…the total momentum in the system right before an “event” will be equal to the total momentum right after the “event” Reminder: Conservation of Momentum

  3. Kinetic Energy (K) • The energy a body has because it is moving • If a cheetah has a mass of 47.0 kg, andaccelerates from rest to a speed of 26.8 m/s in 6.00 s, what is her change in kinetic energy? Click picture for source site

  4. Collisions TYPE Kinetic Energy Momentum Elastic: Objects bounce off each other undamaged Conserved Conserved NOT conserved Conserved Inelastic: Objects impact and separate, but there has been damage done to each Objects impact and STICK TOGETHER as one larger mass with the same, slower velocity NOT conserved Conserved Perfectly Inelastic:

  5. Collisions TYPE Kinetic Energy Momentum Elastic: Conserved Conserved NOT conserved Conserved Inelastic: NOT conserved Conserved Perfectly Inelastic:

  6. Example problem: • A freight train is being assembled in a switching yard. Boxcar #1 has a mass of 6.5 x 104 kg, and Boxcar #2 has a mass of 9.2 x 104 kg. If car 1 is moving with a velocity of +0.80 m·s-1, and car 2 hits it from behind with a velocity of +1.2 m·s-1, with what velocity will the two cars move with together after coupling?

  7. Example problem: solution

  8. Starting from rest, two ice skaters push off against each other on smooth, level ice. Skater 1 has a mass of 54 kg and moves away from her friend (mass = 88 kg) with a velocity of 2.5 m/s. Find the “recoil” velocity of the second skater. Problem 2:

  9. Problem 2: Solution

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