Finding the Right Approach

This past week we had a lab task to develop and teach an interest approach activity to our peers. The activity I prepared and taught was Bernoulli principle using windbags. The purpose was to gain the interest of the principle before teaching about it. This would allow me to introduce a not so energizing topic with a fun activity to relate it too. 

To give this lesson some context, prior knowledge of the carburetor would be helpful for understanding the topic. The lesson started out well. I introduced the topic of the day, and led into the bellwork. I should have given the students more time to answer the bellwork question because I don't believe I gave them ample time to complete it. The activity went as planned. To quickly fill the windbag, the person has to keep the end that they are blowing into open and 10 inches away from their mouth. The student is not to know these things as it is to demonstrate the Bernoulli's equation of continuity. This would be taught further into the lesson. As the activity finished, I asked the students questions as to how and why my windbag filled before the other students. This is where it went down hill. 

My assumption is that I did not ask students in a clear way. My questions confused them more than the concept I was trying to teach. I am struggling to phrase questions in a meaningful way that doesn't confuse my students. What is the best practice to ask meaningful clear questions? How do you engage those students that don't want to participate or that are constantly confused? 

I feel like I am not performing well at all when things get difficult. I am not sure how to overcome. What are some strategies to overcome setbacks in performance?