Choose between "painted concrete" and "plain concrete". Question: Painted concrete is less sticky then plain concrete. This means that a hand ball rolled along which surface will create less heat? (A) plain concrete (B) painted concrete
plain concrete

Choose between "kitchen counter" and "office desk". Question: Jill found that her mug had a more silky glide when moved across the kitchen counter versus doing the same thing across the office desk. Clearly there was considerably less friction on (A) the office desk. (B) the kitchen counter
office desk

Choose between "dance floor" and "living room floor". Question: Jim's dress shoes slide around more on a dance floor then on his living room floor. This means his dress shoes move faster over the (A) dance floor (B) living room floor
dance floor