Final answer:
The scenario with two billiards balls colliding in isolation is an example of a closed system with respect to momentum because the total momentum remains constant, even though kinetic energy is transferred from one ball to another.
Step-by-step explanation:
The question describes a scenario where a billiards ball of mass 0.2 kg traveling at 1 m/s strikes a second stationary ball of the same mass, and after the collision, the second ball travels at 1 m/s while the first comes to rest. This suggests a closed system since the billiards balls are the only objects considered, and the total momentum before and after the collision remains the same within the system, which indicates that no external forces are acting on the system. However, there is an implication of perfectly inelastic collision because the kinetic energy appears to be transferred entirely from the first ball to the second.
In our scenario, the total momentum before the collision for both balls is 0.2 kg * 1 m/s = 0.2 kg m/s, and after the collision, the momentum of the second ball is also 0.2 kg * 1 m/s = 0.2 kg m/s, with the first ball coming to rest, so momentum is conserved as per the scenario. Typically, in real-world scenarios, there are external forces such as friction and the interaction with the table, but these are not considered here as per the question's instructions. Therefore, the system is closed with respect to momentum.