There are two kinds of acceleration that can occur in rotational motion - tangential and centripetal.

What best describes these two kinds of acceleration?

1. Tangenital acceleration is always constant, while centripetal is always changing
2. There is no difference - they are two names for the same things
3. centripetal acceleration is always towards the center, while tangential is along the edge
4. Centripetal acceleration is always constant, while tangential is always changing
5. centripetal acceleration is due to forces, whereas tangential is due to motion
6. centripetal acceleration is along the edge of the circle, while tangential is toward the center