Experiment on the Conservation of Momentum in College Physics; Under what circumstances will the initial momentum be less than the final momentum?

If the air cushion guide rail is absolutely horizontal, this will not happen. Only the final momentum is less than or equal to the initial momentum.

If the air cushion guide rail is not horizontal and inclined to the direction of the slider movement, the situation you mentioned may occur.

Because we measured the speed of the slider before the collision. After the slider passes through the photoelectric gate, it continues to accelerate and then collides with the touched slider. In this way, the actual speed of the collision is greater than the speed we measured. The measured final momentum is greater than the measured initial momentum.

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