Physics Chapter Index

Linear Momentum

What Is Linear Momentum?	Impulse	Conservation of Momentum
Collisions	Center of Mass	Key Formulas
Practice Questions	Explanations

Linear Momentum

The concept of linear momentum is closely tied to the concept of force—in fact, Newton first defined his Second Law not in terms of mass and acceleration, but in terms of momentum. Like energy, linear momentum is a conserved quantity in closed systems, making it a very handy tool for solving problems in mechanics. On the whole, it is useful to analyze systems in terms of energy when there is an exchange of potential energy and kinetic energy. Linear momentum, however, is useful in those cases where there is no clear measure for potential energy. In particular, we will use the law of conservation of momentum to determine the outcome of collisions between two bodies.

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