Q: Question: Kevin rolled his ping pong ball over a sheet of paper and over a bathtub. He figured out that the sheet of paper is rougher than his bathtub. This indicates that the _____ has less friction (A) sheet of paper (B) bathtub Do not use A and B to answer the question but instead, choose between "sheet of paper" and "bathtub".
A: bathtub

Q: Question: Sue wrapped saran wrap over the bowl of her toilet and dropped a potato in the middle of it. The potato fell straight through. She then put down the toilet lid and conducted the experiment again, and the potato bounced harmlessly off the lid. That's because (A) the saran wrap is thinner (B) the toilet lid is thinner Do not use A and B to answer the question but instead, choose between "saran wrap" and "toilet lid".
A: saran wrap

Q: Question: An elephant has escaped from the zoo and is on a rampage through the streets of the city! Employees armed with tranquilizer guns find the elephant and take shots at its thick hide, while one stray dart hits a person right in the arm. Who has more resilient protection against the darts? (A) The human (B) The elephant Do not use A and B to answer the question but instead, choose between "elephant's hide" and "person's arm".
A: person's arm

Q: Question: James is riding his scooter on the sidewalk. The sidewalk ends and he decides to try riding the scooter on the grass. It's harder to push the scooter on the grass because of the rough surface. James is able to ride faster on the (A) sidewalk (B) grass. Do not use A and B to answer the question but instead, choose between "grass" and "sidewalk".
A: grass