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Chapter 9
Moment and Impulse
Momentum is
a vector quantity
kg m/s or N s.
The area under the impulse graph J
x
= Delta P
Note F avg = J
x
/ Dt
For these probs.
Sketch the situation. Use two drawings, labeled “Before” and “After,” to show the
objects before they interact and again after they interact.
•
Establish a coordinate system. Select your axes to match the motion.
•
Define symbols. Define symbols for the masses and for the velocities before and
after the interaction. Position and time are not needed.
•
List known information. Give the values of quantities known from the problem
statement or that can be found quickly with simple geometry or unit conversions.
Beforeandafter pictures are usually simpler than the pictures you used for
dynamics problems, so listing known information on the sketch is adequate.
Law of conservation of momentum:
Momentum before and after is the same.
2
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This note was uploaded on 04/28/2008 for the course PHY 2111 taught by Professor Johnevans during the Summer '07 term at Georgia Perimeter.
 Summer '07
 JohnEvans
 Momentum

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