Roller coaster Physics

Thinking back to our roller coaster build, how would Newton's Laws be applied?  Explain how at least one of Newton's Laws would apply.  Also, how does Potential and Kinetic Energy vary as a cart moves along a roller coaster's path?  Be sure to answer these questions in your original post and post a response to at least one classmate. 
*Don't just agree or disagree with their response, add something additional to their post. 
*Remember  to post your initials and class period to receive full credit

So, is the force still with you? Thinking back to Forces and Motion, how would you define a force? What happened to the force when we pulled on our elastic bands? How do we measure force? Use these questions to stimulate your thinking as you write your response. Also, respond to at least one classmate to keep the discussion going.