Ok, maybe this is simple and I'm overthinking it... The question asked "Which cart would be easier to push" Four carts were shown. They are basic flat carts on four wheels. Cart 1: All four wheels small (4" diameter) Cart 2: Front wheels small (4" D), back wheels large (12" D) Cart 3: Front wheels large (12" D), back wheels small (4" D) Cart 4: All four wheels large (12" D) This isn't a question asking any specifics - just asks which would be easier to push. I don't want to overthink the weight of the wheels, and the difference between getting the load started versus maintaining momentum. My thought was that the larger wheels front and back would be "easier to push" since a larger radius would require less effort. Am I nuts? Been out of college for 10 years now and can't think of the right formula or principle that applies.