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Conservation of Momentum

Conservation of Momentum. IDS Physics: Unit 03 M. Blachly. Review. Review. If a tennis racquet applies a force of 200. N on a 0.15 kg tennis ball, which goes from -15 m/s to +20. m/s as a result, how long did the collision last?. Conservation of Momentum.

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Conservation of Momentum

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  1. Conservationof Momentum IDS Physics: Unit 03 M. Blachly

  2. Review

  3. Review • If a tennis racquet applies a force of 200. N on a 0.15 kg tennis ball, which goes from -15 m/s to +20. m/s as a result, how long did the collision last?

  4. Conservation of Momentum • If there is no net external force on a system, then the momentum of the system is conserved.

  5. Conservation of Momentum • If a system can be identified on which there is no net force, then momentum is conserved for that system. • Internal forces do not change the total momentum of the system.

  6. Demo • http://www.physics.umn.edu/outreach/pforce/circus/

  7. Example 1 • A 85 kg. boy holding a 5.0 kg. ball is at rest. If the boy throws the ball at 3.0 m/s to the left, what is his velocity after throwing the ball?

  8. Collisions • There are two special types of collisions: • Perfectly Elastic Collisions • Momentum is conserved • Energy is conserved • Completely inelastic collisions • Momentum is conserved • The colliding objects join and have a common final velocity • Third type: inelastic collisions are any collision that are not Perfectly Elastic or Completely inelastic

  9. Example 2 • A 1 kg. block of wood is sliding to the right with a speed of 10. m/s when a 100. g arrow going -85 m/s hits it. What is the final velocity of the pair after the collision?

  10. Example 3: Hollywood Physics? • A 500. kg. tiger is charging some nefarious bad-guy at 8.0 m/s. The bad guy shoots the tiger with a huge, 500. gram bullet that exits the gun at a whopping 400. m/s. Assuming that the bullet lodged in the tiger, what is the final velocity of the beast/bullet combination? • Disclaimer: IPS, ATHS, The Magnet Academy and Mr. Blachly do not condone cruelty to animals nor do we endorse violence as a solution to the problem of charging tigers. This problem is used solely to demonstrate the impossibility of the projected Hollywood reality.

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