Material preparation

8 marbles of the same size, 2 thick books, and 1 piece of paper.

Experimental steps

1 As shown in the picture below, put a white paper between two books, put 7 marbles into the groove formed by the white paper, and arrange them A row, close to each other.

2 Use the remaining marble to hit this row of marbles.

3 Then try to hit two at the same time, and then use 3 to hit at the same time.

Phenomenon

When hitting with 1 pinball, the last one in the row will be bounced away. If 2 pinballs are hit at the same time, 2 pinballs will be bounced away. analogy.

Answer to the reason

The momentum of the initial pinball was transferred from one to the next and all the way to the last one when it hit. There was no obstacle in front of this pinball. It uses the momentum it gains to move out. When there are two or more impacting balls, their momentum is greater and will be transferred to more balls.