Lecture19-21_1p

# Lecture19-21_1p - Lecture 19: based on G: chapter 7...

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Momentum Conservation of Momentum Collisions and Impulse Lecture 19: based on G: chapter 7 155

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Momentum: Momentum is defined as: The rate of change of momentum of an object is equal to the net force applied to it: this can be shown using Newton’s second law the more momentum an object has, the harder it is to stop it it is a vector with the same direction as velocity! 156
Conservation of Momentum: During a collision , measurements show that the total momentum does not change: The total momentum of an isolated system of objects remains constant! 157

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158
Collisions and Impulse: During a collision, objects are deformed due to the large forces involved. Since the time of the collision is very short, we need not worry about the exact time dependence of the force, and can use the average force . We can write the total change of momentum as: and define the impulse : 159

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160
Conservation of Energy and Momentum in Collisions Elastic Collisions in One Dimension Inelastic Collisions Lecture 20: based on G: chapter 7 161

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## Lecture19-21_1p - Lecture 19: based on G: chapter 7...

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