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Advanced concepts in momentum

Advanced concepts in momentum. Pictures and notes. 2-d momentum. We are still working with Momentum. Conservation of momentum in one direction Conservation of momentum in 2 dimensions. Collisions. All collisions between objects that conserve momentum are divided into 3 categories

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Advanced concepts in momentum

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  1. Advanced concepts in momentum Pictures and notes

  2. 2-d momentum

  3. We are still working with Momentum • Conservation of momentum in one direction • Conservation of momentum in 2 dimensions

  4. Collisions • All collisions between objects that conserve momentum are divided into 3 categories • Completely Inelastic: object stick together after collision • Inelastic: object bounce off each other • Elastic: objects bounce off each other AND Kinetic energy of the system is conserved

  5. Grenade problem

  6. How does it do damage • A small explosive charge is surrounded by metal filings, spheres, nails…. • When the charge explodes, it transfers energy to each piece of shrapnel, with move in all directions from the core.

  7. The story of the grenade and Brandywine High True tale

  8. Connection • Sum of momentum of all parts before explosion must equal sum of all parts afterward. • Smaller shrapnel move at high speeds

  9. Back to grenades and conservation of momentum • Draw free-body diagrams • Calculate momentum • Determine components of momentum • Solve for unknowns (or their components)

  10. Other 2-deminsional problems • Collisions • Pool • Questions 22-25 pg 243

  11. How do grenades connect to momentum?

  12. How does a grenade work

  13. Example of auto accident • A 1209 kg car traveling north at 12.7 m/s strikes a 2378 kg Truck traveling 10.3 m/s east. The ground is extremely icy and level. • If the wreckage sticks together, how fast will it move and in what direction • If car and truck stay intact, and the truck moves 11.0 NE, what speed and direction will the car move?

  14. Conservation of angular momentum

  15. Similar to linear conservation • IN a closed system, the amount of rotational momentum is conserved, but can be transformed or transferred

  16. Angular momentum

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