We've decided that the positive direction should be pointed downward because the direction of motion of the eyelid is downward. Now, let's try to identify as many variables as possible and located them, if necessary, on the diagram of the eye.
What Does the Bracket Represent? Self-Quiz
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!