Lecture15 - Where would prefer to be at the moment of...

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Where would prefer to be at the moment of collision? Newton 2 nd Newton 3 rd law Need another way to express Newton’s law! How can we describe this explosion?
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Linear Momentum Newton 2 nd Newton 3 rd law Linear Momentum Conservation Linear Momentum How to define momentum? F = ma = m dv/dt m dv = F dt v 1 v 2 t 1 t 2 F = m dv/dt F dt = m dv m v 2 – m v 1 = t 1 t 2 F dt Definition: LINEAR MOMENTUM p = mv
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p = mv p x = mv x In terms of components p y = mv y p z = mv z The linear momentum of a particle of mass m and velocity v is a vector Magnitude Direction (always // v) [p] = [Kg m/s] Units The concept of momentum provides a quantitative distinction between heavy and light objects p truck = Mv truck p car = mv car If v truck =v car p truck >> p car
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The rate of change of momentum of a body is equal to the net force acting on it Newton 2 nd law in terms of momentum p = mv taking the derivative of both sides d t d p = m d t d v = F net F net = F i = d t d p a
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Newton 2 nd law in two forms:
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Lecture15 - Where would prefer to be at the moment of...

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