A Physical Impact on the Motion of a Cart

A cart is accelerated as it moves along a track by force applied to it via a rope attached to a hanging mass. What factors might have an impact on the motion of the cart?

Which factors are not quantifiable or over which you have little or no control? Of the factors you consider, which directly relate to each other? Can you identify independent and dependent variables? Predict how changes in the force applied to the cart will affect the kinetic energy of the cart. Also, predict how the kinetic energy of the cart depends on the distance the cart has moved. State not only what you think each relationship is but also why you think so.