I've never played Super Metroid, when I saw your post, I glanced at one of the 50 FAQs for the game on
GameFAQs to see how you used the Morph Ball and saw mention of acquiring the power up first. I'd suggest looking there for any game play help you need.
The only Metroid game I've played is the original for NES but even in it you had to acquire the Morph Ball, it's just that it was within a few feet of where you start.