Momentum and Impulse

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Momentum and Impulse

• 6-1

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Liner Momentum

• Examine how force and the duration of the
  collision between objects affect their momentum.

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Momentum describes an objects motion
SI units are the Kg?m?s-1
Vector or scalar?
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• The bowling ball and the dodge ball.
• Moving at the same velocity, which has more
  momentum?

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Attempt Practice 6A, p. 209

• Answers
• 2.5 x 103 Kg?m?s-1 to the right
• a. 1.2 x 102 Kg?m?s-1 to the NW
• b. 94 Kg?m?s-1 to the NW
• c. 27 Kg?m?s-1 to the NW
• 46 m?s-1

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A change in momentum takes force and time
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A change in momentum takes force and time

• Stopping the dump truck and the toy truck moving
  down the same hill.
• From these examples we see that momentum (p) is
  closely related to force (F).

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A change in momentum takes force and time

• In simple terms
• Small force over long time can produce the same
  change in momentum as a big force over a _______
  time.

Follow-through in sports?
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Stopping time and distance depends on the
impulse-momentum theorem

• If truck has twice the mass.
• And, the brakes are assumed to apply the same
  force.
• What affect does this have on stopping time and
  stopping distance?

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Empty Truck
Truck w/ Load (2m)
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A change in momentum over a longer time requires
less force