Here's why:

* Momentum is a measure of how much motion an object has. It depends on both the object's mass and its velocity (speed and direction).

* Formula for momentum: Momentum = mass x velocity

* Since the bowling ball has a significantly greater mass than the soccer ball, even at the same speed, it will have a much higher momentum.

Think of it this way: it would take more force to stop a bowling ball rolling at a certain speed than it would to stop a soccer ball rolling at the same speed. This is because the bowling ball has more momentum.