WordNet
conservation of momentum
n. the principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system
Usage examples of "conservation of momentum".
Teleportation obeyed the Laws of Conservation of Energy and Conservation of Momentum.
This affects conservation of momentum, statements about kinetic energy, and even the law of gravity.
The principle was the conservation of momentum, in this case angular momentum or spin.
Occasionally, propelled by a gust of wind, they make abrupt changes in direction, uncharacteristic of aircraft and in seeming defiance of the conservation of momentum - if you don't realize they're hollow and weigh almost nothing.
Johnny explained to me that there was something about conservation of momentum involved here.