ch07 - Chapter 7 Impulse and Momentum 7.1 The...

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Chapter 7 Impulse and Momentum
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7.1 The Impulse-Momentum Theorem There are many situations when the force on an object is not constant.
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7.1 The Impulse-Momentum Theorem DEFINITION OF IMPULSE The impulse of a force is the product of the average force and the time interval during which the force acts: t = F J Impulse is a vector quantity and has the same direction as the average force. s) (N seconds newton
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7.1 The Impulse-Momentum Theorem t = F J
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7.1 The Impulse-Momentum Theorem DEFINITION OF LINEAR MOMENTUM The linear momentum of an object is the product of the object’s mass times its velocity: v p m = Linear momentum is a vector quantity and has the same direction as the velocity. m/s) (kg nd meter/seco kilogram
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7.1 The Impulse-Momentum Theorem t - = o f v v a a F = m t m m - = o f v v F ( 29 o f v v F m m t - =
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7.1 The Impulse-Momentum Theorem ( 29 o f v v F m m t - = final momentum initial momentum IMPULSE-MOMENTUM THEOREM When a net force acts on an object, the impulse of this force is equal to the change in the momentum of the object impulse
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7.1 The Impulse-Momentum Theorem Example 2 A Rain Storm Rain comes down with a velocity of -15 m/s and hits the roof of a car. The mass of rain per second that strikes the roof of the car is 0.060 kg/s. Assuming that rain comes to rest upon striking the car, find the average force exerted by the rain on the roof. ( 29 o f v v F m m t - =
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The Impulse-Momentum Theorem Neglecting the weight of the raindrops, the net force on a raindrop is simply the force on the raindrop due to the roof. o
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ch07 - Chapter 7 Impulse and Momentum 7.1 The...

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