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For example, a 1 kg model airplane, traveling due north at 1 m/s in straight and level flight, has a momentum of 1 kg⋅m/s due north measured with reference to the ground. Many particles The momentum of a system of particles is the vector sum of their momenta.
The units and nature of each generalized momentum will depend on the corresponding coordinate; in this case p z is a translational momentum in the z direction, p s is also a translational momentum along the curve s is measured, and p φ is an angular momentum in the plane the angle φ is measured in. However complicated the motion of the system ...
Euler's second law states that the rate of change of angular momentum L about a point that is fixed in an inertial reference frame (often the center of mass of the body), is equal to the sum of the external moments of force acting on that body M about that point: [1] [4] [5]
Newton's laws are often stated in terms of point or particle masses, that is, bodies whose volume is negligible. This is a reasonable approximation for real bodies when the motion of internal parts can be neglected, and when the separation between bodies is much larger than the size of each.
Hamilton's equations give the time evolution of coordinates and conjugate momenta in four first-order differential equations, ˙ = ˙ = ˙ = ˙ = Momentum , which corresponds to the vertical component of angular momentum = ˙ , is a constant of motion. That is a consequence of the rotational symmetry of the ...
Using similar arguments, this can be generalized to a system with an arbitrary number of particles. In general, as long as all forces are due to the interaction of objects with mass, it is possible to define a system such that net momentum is never lost nor gained. [4]: ch.12 [5]
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The third term on the right is the net acceleration of the mass within the volume due to any body forces (here represented by f body). Surface forces, such as viscous forces, are represented by F surf, the net force due to shear forces acting on the volume surface. The momentum balance can also be written for a moving control volume. [3]