One of the struggles we have been having so far with our project, and we encountered it a lot today, was when we used double sided tape to stick the tube that the marble goes in, onto a pipe, it would create little bumps in the bottom of the tube. And then, when the marble hit those bumps, it was traveling at such a hig velocity from the incline, it would just shoot off the tube instead of turning, subject to Newtons First Law, "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force." We fixed our problem by placing strips of cardboard underneath the tube in between the tube and the pipe, that allowed for a smooth ride down.
Here is a picture of our roller coaster after working on it today.
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