I am testing my students' logic. What is the answer they should choose between "field" and "parking lot"? Logic test: Bob buys a new tractor. He drives it around a parking lot before he buys it. Later he is at home in his field driving his tractor in the field. He realizes that the tractor generates more heat while driving over the field. This is because there is less friction (A) on the road (B) in the field.
field