We do: The objects in the video both have a mass of 1.5 kg. Explain, using the idea of momentum, why the two objects stop moving after they collide.
In a closed system, the total momentum _________ an event is _____________the total momentum ___________ an event.
Therefore, the total momentum _____________ the objects collide is ________________the total momentum ________________ the objects collide.
Before the objects collide, they have _____________ but opposite momentums, so total momentum is ____________.
After colliding, they are at rest, so total momentum is still ___________, and momentum is ______________.