Q:I am testing my students' logic. What is the answer they should choose between "sidewalk" and "grass lawn"? Logic test: Eric is trying out his rollerblades. He puts them on on the grass lawn and has a hard time skating. When Eric skates on the sidewalk, he can go fast and it is easy. The surface with the most resistance is the (A) grass lawn (B) sidewalk.
A:
sidewalk