Can you explain to me in detail the process of verifying the conservation of physical momentum with air cushion guide rail in high school? I probably understand a little.

1. Install two photoelectric gates (timers) at proper positions on the air cushion guide rail, so that the light parts of the slider can pass through the photoelectric gates to realize light blocking and timing.

2. Ventilate the air-cushion guide rail and adjust the air-cushion guide rail to keep horizontal (mainly meeting the momentum conservation condition of zero resultant force). The verification method is to let the slider move still or at a uniform speed on the guide rail.

3. Use two sliders with known mass to make them move towards each other, passing through two timing gratings before collision and two gratings after collision. Record the time when the two sliders pass through the photoelectric gate before and after collision.

4. Measure the length of the light shield, and divide this length by time to get the speed.

5. Calculate the total momentum before and after the collision. Please verify that they are equal.