I am testing my students' logic. What is the answer they should choose between "street" and "grass"? Logic test: Jacob worked up a sweat riding his bicycle across the grass in the park, but had an easier time when finally he came to the street. This was because the surface of the street had (A) less friction (B) more friction
street

I am testing my students' logic. What is the answer they should choose between "dry floor" and "wet floor"? Logic test: Sliding boots across a dry floor makes them heat up less then sliding them across a wet floor. This means that the _____ is smoother (A) wet floor (B) dry floor
wet floor

I am testing my students' logic. What is the answer they should choose between "kitchen table" and "kitchen floor"? Logic test: Rolling a penny roll on a kitchen table is rather fluid, but rolling it on a kitchen floor is rather rugged. This means the surface of the _____ has more friction (A) kitchen table (B) kitchen floor
kitchen floor

I am testing my students' logic. What is the answer they should choose between "waxed vinyl floor" and "vinyl floor, wax worn off"? Logic test: A girl noticed she could slide further while wearing her socks on the vinyl kitchen floor the morning after her mother waxed it then she could at the end of the week, when it had warn off. This is because the waxed kitchen floor had _____ then when the wax was worn off. (A) less friction (B) more friction
waxed vinyl floor