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Collisions and
Impulse
Section 7.3
• How do measure an impulse?




Collisions and Impulse
• Large forces occur
  during collisions
• These forces deform
  objects
• Deformation occurs
  because huge jumps
  in forces happen over
  a short amount of
  time




Collisions
• Time of collisions is
  very short
• We need not worry
  about the exact time
  dependence of the
  force
• We can use average
  force




Collisions
•




Impulse
• Can have the same
  change in momentum
• A large force acting
  for a short time
• A small force acting
  for a longer time
• Bend your knees
  when you land



Impulse
• If I drop an egg…
• http://www.youtube.c
  om/watch?v=C08JBiq
  2eJ4




Why does it matter?
• Driving along, suddenly a brick wall appears in front of
  you and you crash. Your mass is 60 kg and you were
  driving 25 m/s. With no airbag, your body comes to rest
  in 3 x 10-4 s. An airbag can extend the time to rest by a
  factor of 100. Calculate the two impulses.




Why airbags?
•   Read Section 7.3
•   Do Problems # 15 – 19, Page 188
•   Bonus # 21
•   Egg Drop Challenge




Homework

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Advanced/Notes 7.3

  • 2. • How do measure an impulse? Collisions and Impulse
  • 3. • Large forces occur during collisions • These forces deform objects • Deformation occurs because huge jumps in forces happen over a short amount of time Collisions
  • 4. • Time of collisions is very short • We need not worry about the exact time dependence of the force • We can use average force Collisions
  • 6. • Can have the same change in momentum • A large force acting for a short time • A small force acting for a longer time • Bend your knees when you land Impulse
  • 7. • If I drop an egg… • http://www.youtube.c om/watch?v=C08JBiq 2eJ4 Why does it matter?
  • 8. • Driving along, suddenly a brick wall appears in front of you and you crash. Your mass is 60 kg and you were driving 25 m/s. With no airbag, your body comes to rest in 3 x 10-4 s. An airbag can extend the time to rest by a factor of 100. Calculate the two impulses. Why airbags?
  • 9. Read Section 7.3 • Do Problems # 15 – 19, Page 188 • Bonus # 21 • Egg Drop Challenge Homework