You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Q: Paragraph- Sent 1: Friction is a force that works against motion.
Sent 2: It occurs between two surfaces that are touching.
Sent 3: Friction can be good and bad.
Sent 4: How can this be?
Sent 5: Think about some common things we do.
Sent 6: For example, we put rubber tires on our cars.
Sent 7: The tires cause friction against the road.
Sent 8: Without rubber tires, the car would slide around.
Sent 9: Think about the bottom of your bathtub.
Sent 10: Do you have tape that has a sandy texture?
Sent 11: Maybe you use a rubber mat.
Sent 12: Both materials prevent you from slipping.
Sent 13: If you live in a really cold place, you have probably seen icy sidewalks.
Sent 14: Perhaps you have put sand on the frozen surface.
Sent 15: The sand increases friction.
Sent 16: It helps to keep you from slipping and falling.
Sent 17: Is friction always a good thing?
Sent 18: Too much friction can also be harmful.
A:
What can be done to prevent falls on icy sidewalks?