In what situations is momentum not conserved?

Momentum is not conserved if there is friction, gravity, or net force (net force just means the total amount of force). What it means is that if you act on an object, its momentum will change. This should be obvious, since you are adding to or taking away from the object’s velocity and therefore changing its momentum.

How is momentum connected with the law of conservation of mechanical energy?

In this case, the conservation of mechanical energy can be expressed with the following equation. An elastic collision is defined as one in which the kinetic energy is conserved (as well as the momentum). If the collision is inelastic, then the only conservation law that is applicable is the conservation of momentum.

How do you know if momentum is conserved or not?

Momentum is conserved when the mass of the system of interest remains constant during the interaction in question and when no net external force acts on the system during the interaction.

Does conservation of momentum mean conservation of energy?

Conservation of Energy: the total energy of the system is constant. Conservation of Momentum: the mass times the velocity of the center of mass is constant. Conservation of Angular Momentum: The total angular momentum of the system is constant. The acceleration of the center of mass is zero.

Can momentum be conserved for a system if there are external forces acting on the system?

Conservation of momentum is violated only when the net external force is not zero. But another larger system can always be considered in which momentum is conserved by simply including the source of the external force.

What must be true for momentum to be conserved in a collision?

A system must meet two requirements for its momentum to be conserved: The mass of the system must remain constant during the interaction. As the objects interact (apply forces on each other), they may transfer mass from one to another; but any mass one object gains is balanced by the loss of that mass from another.

Can momentum be conserved for a system if there are external forces acting on the system if so under what condition if not why not?