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Chapter 9

# Chapter 9 - Chapter 9 Moment and Impulse Momentum is a...

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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. Before-and-after 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 1 2 1 ( ) t x x x x t p p p F t dt = - = 2 1 "impulse Defi " niti ( on: ) x t x t J F t dt x = (area under force curve)

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