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Conservation of Momentum

Conservation of Momentum. The net momentum of an isolated system cannot change . Isolated  no net external force is applied. Momentum before equals momentum after. p i = p f. Rockets are able to move in the nothingness of space because of this.

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Conservation of Momentum

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  1. Conservation of Momentum

  2. The net momentum of an isolated system cannot change. • Isolated no net external force is applied. • Momentum before equals momentum after. • pi = pf

  3. Rockets are able to move in the nothingness of space because of this. • Gas is expelled at high velocity, causing the rocket to move forward.

  4. m1vi1 + m2vi2 = m1vf1 + m2vf2

  5. Example 1 • A 76 kg boater, initially at rest in a stationary 45 kg boat, steps out of the boat and onto the dock. If the boater moves out of the boat with a velocity of 2.5 m/s to the right, what is the final velocity of the boat?

  6. Inelastic Collisions • The objects stick together after the collision. • Ex: guy jumping on skateboard, tackling someone.

  7. Kinetic energy IS NOT conserved in an inelastic collision. • Usually goes into thermal energy…i.e., HEAT.

  8. Elastic Collisions • Bounce off each other, no loss in kinetic energy.

  9. Realistically, there are no purely elastic or inelastic collisions. • They’re ideals.

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