This picture is about momentum because when you throw a bowling ball the harder you throw it, the more momentum it has. If it has a lot of momentum it goes really fast and hits all the pins. (As long as you throw it in the right direction.)
One time, on my very last turn, a little kid in the other lane accidentally threw his ball into my lane and hit a pin! I was very disappointed that he took my last turn, but at least he hit a pin down and didn't throw it into the gutter.