understand:
1.  Momentum and angular momentum conservation laws are connected with such properties of space as homogeneity and isotropy.
2. Total momentum of interacted bodies constituting the system remains constant only when the sum of all external forces acting on the system equals zero.
3. Total angular momentum of a system remains constant only when the total torque of all external forces equals zero.
4. Angular momentum remains constant not only if a considered system is closed but if the direction of a force is parallel to axis of rotation or if the force is applied to the point lying on the axis of rotation.
5. As angular momentum depends on angular velocity and moment of inertia it is possible to change angular velocity due to change of mass distribution.
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6.
|  know:
Formulation of conservation laws.
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Formulas:
 — momentum of a material point;
 is the total momentum of a system;
 is coordinate of centre of masses;
 is equation of Meshchercky;
 is reactive force;
 is the formula of Tsiolkovskiy;
 is angular momentum of material point;
 is angular momentum of a system;
 is angular momentum of a body.
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 get skills:
1. To write formulas,
2. To determine the modulus and direction of momentum and angular momentum of a body;
3. To determine total momentum and angular momentum of the system of bodies;
4. To solve problems using momentum and angular momentum conservation laws.
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