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Lecture070

# Lecture070 - Momentum Impulse and Collisions Linear...

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Momentum, Impulse and Collisions

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Linear momentum The linear momentum of an object is the product of the object’s mass times its velocity. Linear momentum is a vector quantity and has the same direction as the velocity. The units of linear momentum are kilogram.meter/second.
There are many situations  when the force on an object is  not constant.  The Impulse-momentum theorem

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Impulse: The product of the average force and the time interval during which the force acts. The impulse is a vector quantity Units are Newton seconds (N s) The Impulse-momentum theorem
There are many situations when the force on an object is not constant. The Impulse-momentum theorem

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The Impulse-momentum theorem
When a net force acts on an object, the impulse of this force is equal to the change in momentum of the object! The Impulse-momentum theorem

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You are testing a new car using crash test dummies. Consider  two ways to slow the car from 90 km/h (56 mi/h) to a complete  stop: (i) You let the car slam into a wall, bringing it to a sudden stop. (ii) You let the car plow into a giant tub of gelatin so that it  comes to a gradual halt. In which case is there a greater  impulse  of the net force on the  car?  A. in case (i) B. in case (ii)  C. The impulse is the same in both cases. D. not enough information given to decide
You are testing a new car using crash test dummies. Consider  two ways to slow the car from 90 km/h (56 mi/h) to a complete  stop: (i) You let the car slam into a wall, bringing it to a sudden stop. (ii) You let the car plow into a giant tub of gelatin so that it  comes to a gradual halt. In which case is there a greater  impulse  of the net force on the  car?  A. in case (i) B. in case (ii)  C. The impulse is the same in both cases. D. not enough information given to decide

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A. 20 kg • m/s to the right B. 20 kg • m/s to the left  C. 4.0 kg • m/s to the right D. 4.0 kg • m/s to the left E. none of the above A ball (mass 0.40  kg) is initially  moving to the left at  30 m/s. After hitting  the wall, the ball is  moving to the right  at 20 m/s. What is  the impulse of the  net force on the  ball during its  collision with the  wall?
A ball (mass 0.40  kg) is initially  moving to the left at  30 m/s. After hitting  the wall, the ball is  moving to the right  at 20 m/s. What is  the impulse of the  net force on the  ball during its  collision with the  wall?

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Lecture070 - Momentum Impulse and Collisions Linear...

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