Question: Choose between "tabletop" and  "tablecloth". Question: Jack and Jill are sliding a cellphone back and forth along the tabletop very easily. Their mother puts a tablecloth over the tabletop and it's not as easy to slide the phone anymore. Which surface has less friction? (A) TABLETOP (B) TABLECLOTH
Answer: tabletop

Question: Choose between "metal pipe" and  "plastic pipe". Question: A saw will produce more heat because of friction when sawing through (A) a metal pipe or (B) a plastic one.
Answer: metal pipe

Question: Choose between "sidewalk" and  "boardwalk". Question: Steve notices that when he skateboards over the sidewalk there is less resistance than when he skateboards over the boardwalk at the beach. Steve will move faster when he skateboards over the (A) boardwalk. (B) sidewalk
Answer:
boardwalk