Phys205A_Lecture22

# Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Lecture 22 Chapter 9 Linear Momentum and Collisions Linear momentum Conservation of momentum Impulse

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Linear Momentum z The linear momentum of a particle, or an object that can be modeled as a particle, of mass m moving with a velocity is defined to be the product of the mass and velocity: z z The terms momentum and linear momentum will be used interchangeably in the text v r m = pv r r
Linear Momentum, cont z Linear momentum is a vector quantity z Its direction is the same as the direction of the velocity z The dimensions of momentum are ML/T z The SI units of momentum are kg · m / s z Momentum can be expressed in component form: z p x = m v x p y = m v y p z = m v z

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Conservation of Linear Momentum z Whenever two or more particles in an isolated system interact, the total momentum of the system remains constant z The momentum of the system is conserved, not necessarily the momentum of an individual particle z This also tells us that the total momentum of an isolated system equals its initial momentum
Conservation of Momentum, 2 z Conservation of momentum can be expressed mathematically in various ways z z z In component form, the total momenta in each direction are independently conserved z p ix = p fx p iy = p fy p iz = p fz z

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Phys205A_Lecture22 - Lecture 22 Chapter 9 Linear Momentum...

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