We claim that momentum is conserved. Yet most moving objects eventually slow down and stop. Explain.
The reason that most moving objects eventually slow down and stop.
Answer to Problem 1Q
The reason that most moving objects eventually slow down and stop is because the net external forces action on the system is not zero.
Explanation of Solution
According to Newton’s third law momentum of any closed system is conserved, that is, the system should not have any net external forces acting on it. The net external forces acting on the system must be zero.
But in reality, consider the object is sliding on a slope and stops. The net external force acting on the object is not zero as the friction between the surface and the object is not zero and it is an unbalanced force. Momentum is not conserved in this case.
Conclusion:
Therefore, the reason that most moving objects eventually slow down and stop is because the net external forces action on the system is not zero.
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