Here's a short story: Mike discovered that pavement had less friction than a grassy yard when riding his rollerblades spare time. He moved faster over (A) pavement (B) grassy yard.  What is the most sensical answer between "pavement" and  "grassy yard"?
pavement

Here's a short story: Morgan rides his bike into town and slowly takes a pebbled path. On the way back, he takes a paved path and the trip is much faster. The trip is faster because the paved path had (A) more friction (B) less friction..  What is the most sensical answer between "paved path" and  "pebbled path"?
pebbled path

Here's a short story: A toilet paper roll sliding along a living room floor gets hotter then one sliding across a bathroom floor. Which surface has the most friction? (A) bathroom floor (B) living room floor.  What is the most sensical answer between "living room floor" and  "bathroom floor"?
bathroom floor

Here's a short story: A steel bearing falls onto a garage floor. It rolls across the floor and out the door onto the gravel driveway. The bearing produces more heat as it rolls over the gravel. This is because the _____ is more smooth. (A) garage floor (B) gravel driveway.  What is the most sensical answer between "gravel" and  "garage floor"?
gravel