Advice:
1) On an anonymous message board, I don't want to know that your survey knows my gmail account. Turn this off if you can.
2) Grammar check your intro. Why is user capitalized? Why is this one long sentence and not multiple sentences? Give us a little more understanding of who you are. Are you studying to be a designer? Do you want to do UXR? What is your major? What school is this for? You mention some of this in your post, but it isn't on the actual survey.
3) Question 1 and 2 : What good are hypothetical attitudinal questions? What can you use this data for? How is it different than behavioral data? I claimed that I was going to ollie a 10 stair one time. I jumped down it a few times but I never went down with it. What I think I will do and what I do are two separate things.
4) Question 2: is confusing. Are you talking about on flat? On a quarter pipe? Down a set of stairs? Also, even if we limit the question to being about skating flat... what might change someone's willingness to try a trick more than once? Also, why is this friend asking me to try this trick? Is this a survey question or is this better for observations?
4) Should the forgotten letter question be followed up with a likert question?
5) What is the purpose of the app? What is the purpose of the survey? How should these two questions frame the questions that you ask your sample? What will the data from these questions help you know about your sample? What will you still want to know? Surveys are hard as you get one chance and it has to be done right the first time.