AP Physics B - Impulse and Momentum

AP Physics B - Impulse and Momentum - Impulse and Momentum...

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AP Physics B Impulse and Momentum
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Impulse = Momentum Consider Newton’s 2 nd Law and the definition of acceleration Units of Impulse: Units of Momentum: Momentum is defined as “Inertia in Motion” Ns Kg x m/s
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Example A 100 g ball is dropped from a height of h = 2.00 m above the floor. It rebounds vertically to a height of h'= 1.50 m after colliding with the floor. (a) Find the momentum of the ball immediately before it collides with the floor and immediately after it rebounds, (b) Determine the average force exerted by the floor on the ball. Assume that the time interval of the collision is 0.01 seconds. s m gh v mv mgh K U E E o o o A B / 26 . 6 2 * 8 . 9 * 2 2 2 1 2 = = = = = = s m gh v U K E E o A B / 4 . 5 5 . 1 * 8 . 9 * 2 2 = = = = = s m kg p s m kg p v m p after before / * 54 . 0 ) 4 . 5 ( 100 . 0 / * 626 . 0 ) 26 . 6 ( 100 . 0 = = - = - = = N F F v v m v m Ft o 6 . 116 )) 26 . 6 ( 4 . 5 ( 100 . 0 ) 01 . 0 ( ) ( = - - = - = =
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Impulse is the Area Since J=Ft, Impulse is the AREA of a Force vs. Time graph.
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How about a collision? Consider 2 objects speeding toward each other. When they collide ......
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