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Unformatted text preview: 1 / 9 Physics 131 Lecture 9b If you can find a path with no obstacles, it probably doesnt lead anywhere. Frank A. Clark Impulse Impulse Question Collisions Question Elastic Collisions Example 2 / 9 When applying a force to an object to change its motion, the time in which the force is applied is important in determining the end results Impulse, vector J , is a vector that measures how much force has changed motion vector J = vector F t (1) We can also represent it as how much the momentum has changed vector J = vector p f vector p i (2) This is the ImpulseMomentum Theorem , that impulse is equivalent to the change in momentum Impulse Impulse Question Collisions Question Elastic Collisions Example 3 / 9 The impulsemomentum theorem basically states that your momentum will change if you apply a net force over any time period If vector F is not constant, sometimes we use the average force vector J = vector p = vector F avg t (3) Example: A . 15kg baseball pitched at a speed of 40 m/s is hit straight back to the pitcher at a speed of 60 m/s. What average force was exerted by the bat if it was in contact with the ball for 5 . 10 3 s? Question...
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 Winter '08
 Madrid
 Force, Momentum

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