Momentum, also linear momentum, in physics, fundamental quantity describing
the motion of any object. Momentum is a vector quantity, meaning
that it has both amount and direction, and it is the product of
the mass times linear velocity of a moving object. For an isolated
system, total momentum remains unchanged over time. This conservation
of momentum is one of the most important and universal of the conservation
laws of physics. It holds true even when relativity must be used
for systems moving with velocities that approach the speed of light,
and even when quantum theory is used to describe atomic and nuclear
events and forces. According to Newton's second law of motion—named
after English scientist Sir Isaac Newton—a force acting on an object
in motion is equal to the rate of change of momentum over time.
I: Lecture based on text Vector Mechanics for Engineers,
(Statics and) Dynamics - Buy
the Relativistic Energy-Momentum Relationship
- Momentum - The momentum of a particle is defined as the product of
its mass times its velocity. It is a vector quantity. The momentum
of a system is the vector sum of the momenta of the objects
which make up the system. If the system is an isolated system,
then the momentum of the system is a constant of the motion
and subject to the principle of conservation of momentum.
Momentum and Collisions: Now lets extend our understanding
of translational motion by defining a new term, "linear momentum".
Physics/Topics 110 Labs
to Physics Demonstrations: all about physics
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