Rough surfaces create more friction than smooth surfaces. Thats why cars have tires. Its also why we use rubber mats in areas that might get wet. In your bathtub, you may even use No-Slip tape. No-slip is another way of saying the items has a lot of friction. In Figure 1.9, the blades of the skates are very smooth. Thats why you cant slide across ice with shoes. The soles of your shoes are much rougher than skates. The rougher surface of shoes causes more friction and slows you down. Heavier objects also have more friction. A heavy object presses down with more force. The surfaces are held together more tightly. This makes the surfaces harder to slide past each other. Did you ever try to push something heavy across the floor? Heavy objects are much harder to push than light objects.

Question: "Why do heavier objects have more friction?"

OPTIONS:
- no
- yes

Answer: "Held down with more force to a surface which holds them together more tightly"

Response: yes

Right after the Pentagon was hit, NEADS learned of another possible hijacked aircraft. It was an aircraft that in fact had not been hijacked at all. After the second World Trade Center crash, Boston Center managers recognized that both aircraft were transcontinental 767 jetliners that had departed Logan Airport. Remembering the "we have some planes" remark, Boston Center guessed that Delta 1989 might also be hijacked. Boston Center called NEADS at 9:41 and identified Delta 1989, a 767 jet that had left Logan Airport for Las Vegas, as a possible hijack. NEADS warned the FAA's Cleveland Center to watch Delta 1989. The Command Center and FAA headquarters watched it too. During the course of the morning, there were multiple erroneous reports of hijacked aircraft. The report of American 11 heading south was the first; Delta 1989 was the second. NEADS never lost track of Delta 1989, and even ordered fighter aircraft from Ohio and Michigan to intercept it. The flight never turned off its transponder. NEADS soon learned that the aircraft was not hijacked, and tracked Delta 1989 as it reversed course over Toledo, headed east, and landed in Cleveland. But another aircraft was heading toward Washington, an aircraft about which NORAD had heard nothing: United 93. United Airlines Flight 93 FAA Awareness. At 9:27, after having been in the air for 45 minutes, United 93 acknowledged a transmission from the Cleveland Center controller. This was the last normal contact the FAA had with the flight. Less than a minute later, the Cleveland controller and the pilots of aircraft in the vicinity heard "a radio transmission of unintelligible sounds of possible screaming or a struggle from an unknown origin." The controller responded, seconds later: "Somebody call Cleveland?"This was followed by a second radio transmission, with sounds of screaming.

Question: "Which flight was reported as hijacked although it never turned off its transponder?"

Response: "Delta Flight 1989"
OPTIONS:
- no
- yes

A: yes

Problem: In Meadowvale , California , on June 9 , 1970 , three babies are born at the height of a total eclipse . Due to the sun and moon blocking Saturn , which controls emotions , the babies develop into children who are heartless and uncaring , with no feelings of remorse for their awful offences . Ten years later , in 1980 , Curtis , Debbie and Steven begin to kill the adults around them and are able to escape detection because of their youthful and innocent fa ades . However , when Timmy and Joyce discover their crimes , they find themselves as the targets of the evil children . Their attempt to warn their neighbors about them are ignored . Soon enough , Beverly discovers Debbie 's horrible secret with the newspaper clippings as evidence as proof and learns that she , Curtis and Steven were responsible for the murders . She realizes that Joyce and Timmy were telling the truth all along and confronts her sister for it . Beverly and Mrs. Brody forbids Debbie from hanging out with Curtis and Steven . Debbie responds by killing her older sister in retaliation with a bow and arrow . They soon attempt to murder Joyce and Timmy . However , they fight back and manages to capture Steven and Curtis . While Timmy calls the police from a neighbor 's house , Debbie manages to escape from the backyard and gets inside her mother 's car . She manages to lie about Curits and Steven trying to set her up to take the fall for the attacks . At the end , Curtis and Steven are arrested by the police much to the shock and anger of the town .

Question: "On what day were Curtis, Debbie and Steven born?"

Answer: "June 9th, 1970"

OPTIONS:
- no
- yes
Answer: yes

Nine families displaced by a fire at Alamo Hills Apartments in March filed lawsuits Wednesday against the apartment complex. They allege that the complex could have done more to protect belongings they were forced to abandon in the aftermath of the blaze. Bernard Dempsey Jr., an attorney with Western Michigan Legal Services, the group that represents the tenants, said Alamo Hills gave the displaced families very limited opportunity to remove belongings. "They were given three days to get their stuff out, and if they couldn't get moved out in three days, their stuff was discarded," Dempsey said. "Alamo Hills just threw it out." Others, he said, lost possessions to looters after the March 23 blaze, which left 78 people temporarily homeless. According to the lawsuit, the tenants were prohibited from entering their apartments to retrieve possessions and were promised that the complex would provide security. A spokesperson for PM One, the company that manages Alamo Hills, could not be reached for comment. Nine separate suits were filed in 8th District Court, which handles civil claims of less than $25,000. "We're asking for the reimbursement of the value of their property and a small amount for stress -- $3,000 on top of their out-of-pocket expenses for their lost stuff," Dempsey said. "They're not looking to get rich off this. A lot of this is simply because they were treated so badly." Dempsey said most of the tenants who filed suits still live at the apartment complex, although many are trying to find homes elsewhere. "The new apartments (they were provided) were not in very good shape. That's actually one of the claims," he said.

Question: "What are the nine families asking for in their lawsuits?"

OPTIONS:
- no
- yes

Answer: "The tenants were prohibited from entering their apartments to retrieve possessions and were promised that the complex would provide security"

Response:
yes