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Ch.8: Momentum

Last updated

Mar 8, 2021
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- 1.7.4: Supplements
- 1.8.1: Illustrations

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It turns out that $\sum\mathbf{F}_{\text{net}}=m\mathbf{a}$ is a special case of Newton's second law. Newton determined that a net force was something that caused a time rate of change of momentum, $\Delta\mathbf{p}/\Delta t$ or $d\mathbf{p}/dt$ , where momentum is defined as $\mathbf{p} = m\mathbf{v}$ . The two descriptions are the same if the mass of the object in question does not change. Therefore, if there is no net force acting on an object or a system of objects, the momentum does not change. This statement is called conservation of momentum. Conservation of momentum, along with conservation of energy, is used in analyzing collisions between objects.

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