The video is being made. Until it arrives, here is what it will say (117 words, about 58 seconds):

Here's Miss Fischer's class in the gym with a plastic bowling set.

Camden rolls the ball toward the pins. The pins stand still.

Then the ball hits the pins. The pins fly, you hear a loud clatter, and the ball slows down.

A moment ago, the pins were still. So what started them flying, and where did that clatter come from?

And if Camden rolls the ball faster next time, what will the pins do?

To find out, we will look at what a moving thing hands over when it hits something, and what happens to both things after the hit.

Okay, so are you ready to find out what happens when things bump into each other?

It ends with a ready line. Then pick a reply below — any reply counts.