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Recoil & Momentum

Recoil & Momentum. Recoil/Explosion: Action-Reaction. Example:. Before a cannon fires a cannonball, both are at rest, so total momentum is zero. Initial momentum of entire system is zero (neither object has KE – neither is moving). Recoil/Explosion: Action-Reaction.

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Recoil & Momentum

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  1. Recoil & Momentum

  2. Recoil/Explosion: Action-Reaction Example: Before a cannon fires a cannonball, both are at rest, so total momentum is zero Initial momentum of entire system is zero (neither object has KE– neither is moving)

  3. Recoil/Explosion: Action-Reaction After the cannon fires the cannonball, both have the same momentum, but in opposite directions, so the total momentum still is zero Note the velocity vectors – why does the cannonball have a greater magnitude of velocity than the cannon? Its mass is less, so its velocity has to be more, than the cannon’s The interaction between the two objects must be equal and opposite

  4. When the astronaut throws the ball, she goes in the opposite direction

  5. Recoil Formula 0 = m1v1f + m2v2f

  6. You Try It! Momentum Rocket = Momentum Exhaust 0 = m1v1f + m2v2f 0 = (2 kg)(5 m/s) + (1 kg)v2f v2f = = -10 m/s A 2 kg rocket zooms upward at 5 m/s. It is propelled by 1 kg of water shooting downward. How fast does the water shoot out?

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