1. The problem statement, all variables and given/known data K, i've been sick from school for 2 weeks and now that im back, my teacher Wont help me, thinking i was skipping because i'm not one of his best students -.- anyways, he gave me this lab and i have no clue what to do. i've read the unit in the textbook but these questions seem impossable to me. Someone please help. the lab was to pull a cart up a ramp using a spring scale. I can do the calculations fine with the formulas in the text book, but the theory i guess i dont understand. (1) "A ramp is used to raise objects a height above the ground. What kind of energy is the "useful energy" that a ramp wishes to achieve?" I know KE and PE but, how are those what the ramp wishes to achieve? (2) "What would be the energy input of a ramp, and how would you determine this value?" i don't know how to determine this, i dont even understand how a ramp can "input" energy. i guess the other 3 questions are common sence, but these 2 have confused me, i don't know if it's the wording of them but if anyone can clear things up, and help me work out an answer, not give me answers, it would be greatly appreciated. Thank's in advance, Justin.