lecture17

# lecture17 - Linear Momentum and Second Newtons Law 2nd...

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Linear Momentum and Second Newton’s Law Definition of momentum: Change in momentum: 2 nd Newton’s Law for any object: Definition of acceleration: a m F dt v d a v m p We can write 2 nd Newton’s Law as: Second Newton’s Law in terms of momentum: dt p d F dt v d m F v md p d p d dt F dt ) v d(m F or or

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p d dt F Impulse p p p p d dt F J p p t t 1 2 2 1 2 1   p t F t t F J ev ev 1 2 The impulse tells us that we can get the same change in momentum with a large force acting for a short time, or a small force acting for a longer time.
Collisions and Impulse The impulse tells us that we can get the same change in momentum with a large force acting for a short time, or a small force acting for a longer time. This is why you should bend your knees when you land; why airbags work; and why landing on a pillow hurts less than landing on concrete .

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A. It decreases the change in momentum B. It decreases the impulse C. It decreases the force on the egg Example: In an egg-tossing contest, two people toss a raw egg back and forth. After each successful toss, each person takes a step back. Catching the egg without breaking it becomes harder and harder. Usually the trick is moving your hand down with the egg when you receive it.
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lecture17 - Linear Momentum and Second Newtons Law 2nd...

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