An isolated rail car of mass M is moving alon | vedclass

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(C) To determine if momentum is conserved,we analyze the external forces acting on the system consisting of the rail car and the bowling balls.$1$. In

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Only the momentum component parallel to the track is conserved.

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(C) To determine if momentum is conserved,we analyze the external forces acting on the system consisting of the rail car and the bowling balls.$1$. In the horizontal direction (parallel to the track),there are no external forces acting on the system because the track is frictionless and the rail car is isolated.$2$. According to Newton's Second Law,if the net external force on a system is zero,the total linear momentum of the system remains constant.$3$. Therefore,the horizontal component of the momentum is conserved.$4$. In the vertical direction,there is an external force acting on the system: the gravitational force (weight) and the normal force from the track. As the balls are dropped,the system experiences a change in vertical momentum due to gravity and the impact with the car floor.$5$. Since the horizontal component of the net external force is zero,the momentum component parallel to the track is conserved.

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