Magnets are able to place a force on certain materials. This force is called a magnetic force. The force a magnet exerts is a little different from the forces you may normally think about. You exert a force on a book when you lift it. You also exert a force on the pedals of your bicycle. In both those cases, those forces cause a change. The change you see in both these cases is called motion. Magnets, too, can produce change. They can produce motion just like you do. Unlike you, magnets do not have to touch something to exert a force. A magnetic force is exerted over a distance. Thats right, a magnet can push or pull certain items without ever touching them. Thats how the maglev train works. Do you know another type of force that does not require objects to touch? These forces are known as non-contact forces. Another type of non-contact force you may be familiar with is gravity. Gravity too can cause changes in motion. Gravity holds our moon in orbit without touching it.

Question: "How do magnets exert force?"

Response: "They exert force without coming into contact with certain material"

A: no

When 74-year-old Penny Sweat was evicted from the HUD-subsidized Glendale Senior Housing in Salt Lake City last month, she moved to a nonsubsidized apartment at five times her previous rent because she was unaware of her rights. It turns out the manager of the seniors complex, its attorneys and government overseers were unaware, too. Lee Kemp, a hearing-impaired World War II disabled vet, also was evicted, but he contacted Utah Legal Services and was told to stay put. Attorney Marty Blaustein then notified Utah Nonprofit Housing Corp., the building's owner, that Kemp's eviction was not legal and that he had a right to a hearing. That didn't stop Utah Nonprofit Housing's attorneys from then sending Kemp a summons to show cause why he had not moved out. Meanwhile, Sweat's granddaughter called Salt Lake City housing officials, federal housing officials, state officials and several agents of Utah Nonprofit Housing to find out about her grandmother's rights. Nobody knew. Blaustein then took Sweat's case along with Kemp's and demanded her ousting be rectified. Utah Nonprofit Housing President Marion Willey returned from an out-of-town trip and learned HUD procedures were not followed. The eviction was activated because of ongoing personality conflicts among seniors in the complex, he said, and the new building manager decided the problems were with Sweat and Kemp. Several tenants blame other neighbors as perpetrators of the rift, however. Willey said when his building manager called attorneys retained by the company, they erroneously told her she could go ahead and kick out the tenants. When she called HUD to make sure, the inquiry got bogged down in bureaucracy and nobody called her back. Willey says he has offered Sweat and Kemp apartments in another complex operated by his company at their old rates. He also is retaining new attorneys.

Question: "Who were the two tenants that were being evicted?"

Response: "Kemp"

A: yes

Living things need non-living matter as well as energy. What do you think matter is used for? One thing is to build bodies. They also need it to carry out the processes of life. Any non-living matter that living things need is called a nutrient. Carbon and nitrogen are examples of nutrients. Unlike energy, matter is recycled in ecosystems. You can see how in Figure 3.11. Decomposers release nutrients when they break down dead organisms. The nutrients are taken up by plants through their roots. The nutrients pass to primary consumers when they eat the plants. The nutrients pass to higher level consumers when they eat lower level consumers. When living things die, the cycle repeats.

Question: "What happens so plants can take nutrients in through their roots?"

Response: "Decomposers release nutrients"

A:
yes