You attach a strong rope or steel cable to a light pole and a car parked on a downhill incline. If you have a student lift, pull, or push perpendicularly on the rope in the center it will be easier to move the car than if you were to push it. Why? Prove this mathematically.
The Attempt at a Solution
I know it has something to do with the tension, but I can't figure out exactly how it works.