Thanks guys, I actually figured it out. I watched a video on KhanAcademy, which explained exactly what I was not understanding.
If anyone else wants to check it out go to khanacademy's website- scroll down to Physics - then click "Centripetal Force and Acceleration Intuition".
Homework Statement
Based on your observations of the behavior of your computer model of a planet orbiting a star, and on your reading in the textbook, which of the following statements about an elliptical orbit are true?
At any instant the momentum of the planet is tangent to the planet's...