Momentum/Impulse

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Momentum/Impulse
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Momentum Recap

• Momentum The product of the mass and velocity of
  an object
• How hard it is to stop something
• Equation p mv
• Units p kgm/s m kg v m/s
• Vector When describing the momentum of an
  object, the direction matters.

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Momentum Recap
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Would you rather

• Would you rather?

1 m/s
100 m/s
http//www.youtube.com/watch?vJK81Ej5hm8s
http//www.youtube.com/watch?viMq0Wyl-3ho
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• Would you rather?

10 m/s
10 m/s
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• Would you rather?

100 m/s
5 m/s
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Momentum Recap

• Collision When 2 objects interact and exchange
  momentum
• 2 Moving (Bounce off)
• 1 Moving (bounce off)
• 1 moving (stick together)
• Explosion

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Momentum Recap

• Conservation of Momentum The sum of the total
  momentum BEFORE a collision, is the same as the
  sum of the total momentum AFTER a collision
• Momentum Before Momentum After
• pi pf
• p1i p2i p3i p1fp2f p3f

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Momentum Recap

• Conservation of Momentum The sum of the total
  momentum BEFORE a collision, is the same as the
  sum of the total momentum AFTER a collision

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Real Deal

• Step 1 Separate BEFORE and AFTER
• Step 2 Make a table (p,m,v) for each object
• Step 3 Eqtn to sum up total momentum BEFORE
• Step 4 Eqtn to sum up total momentum AFTER
• Step 5 Set the equations equal to each other.

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Impulse

• IMPULSE A change in momentum
• Fnet?t ?p m?v
• Units Ns

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Whiteboards

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Impulse

• Super Challenge I Ft