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We did a lab where we leveled a horizontal track and used a massless frictionless pulley...

We did a lab where we leveled a horizontal track and used a massless frictionless pulley system with a weight to pull a cart and measured the potential vs kinetic energy of the closed system to find a slope of -1 when graphed. Why is leveling the track so important? How and why would your results be affected if the track were not level? If we did the experiment again and at the time that the cart is being pulled by the falling mass on the pulley you also push the cart with your finger for the entire motion. Youexamine the values for velocity and deltaH and calcualte the kinetic and potential energy. Would mechanical energy still be conserved? Why or why not?

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