So what is gravity? A typical definition of gravity is that it is a force. It causes an attraction between two masses. According to this definition, anything that has mass exerts a force. Any object exerts gravity on other objects. It does not matter how small it is, it has gravity. The more matter an object has, the more gravity it has. Your pencil has a tiny bit of gravity, but far too little to notice. What about a planet? It would have a lot of gravity. An objects gravity exerts a pull on other objects. Friction only occurs between objects that are touching. Gravity can act between objects that are not touching. In fact, gravity can act over very long distances. Where else can you feel gravity?
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QUESTION: What does the standard definition of gravity indicate?

If you build a campfire, you start with a large stack of sticks and logs. As the fire burns, the stack slowly shrinks. By the end of the evening, all that is left is a small pile of ashes. What happened to the matter that you started with? Was it destroyed by the flames? It may seem that way. What do you think happened? The truth is that the same amount of matter still exists. The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases. The gases floated off into the air, leaving behind just the ashes. Although matter was changed, it was not created or destroyed. Because the same amount of matter still exists, we can say that matter is conserved. You may wonder how it can be conserved if something is now missing? Assume you had measured the mass of the wood before you burned it. Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes. What would you find? The ashes and gases combined have the same mass as the wood you started with. This example illustrates the law of conservation of mass.
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QUESTION: What is left when the stack shrinks?

Roberta Adams skipped the thick how-to guide on child-custody forms and sat down at a computer at the Lamoreaux Justice Center in Orange on Wednesday. The Garden Grove woman answered a series of questions to create and print a form to file with the court. "It's easy," said Adams, 25. "I thought I'd have all kinds of questions and have to take the forms home." A University of California, Irvine, study released Wednesday found an interactive computer system effectively helps people fill out paperwork for restraining orders, eviction defense, small-claims cases and requests for filing-fee waivers. Not only does the system make life easier for people who can't afford a lawyer, but it also might improve efficiency in the courts because the forms, which are printed out when completed, are easy to read and are being filled out correctly, the study found. Since the program started in 2000, more than 6,000 people have used the free system, located in public buildings throughout Orange County. The system was developed by the Legal Aid Society of Orange County with about $800,000 in grants. The program avoids legal jargon, offers a courthouse video tour and sticks to a fifth-grade vocabulary. Users can choose English, Spanish or Vietnamese. Kiosks are in courthouses in Fullerton and Orange, the district attorney's family-support office, the Legal Aid Society in Santa Ana, Irvine City Hall and the San Juan Capistrano Library. The program is also available online. Bob Cohen, executive director of Legal Aid, said the study should clear the way for expansion throughout California. Locally, a program for divorce petitions will be added this summer. Cohen said the system proves the benefit of technology tailored to those who aren't computer-savvy. He said much of the technology now available requires Internet skills and access. Low-income people, however, have less access to computers and less experience using them. "Our clients have to catch up, and they have to become a part of the mainstream," Cohen said.
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QUESTION: What are two benefits of the system?

Tim had always a red bike. His birthday party was coming up and he hoped that his parents would finally get him the bike. When his friends came over for the party, Tim was very worried that he wouldn't get the bike. He looked at all the presents and none of them seemed big enough to have a bike in them. Tim was sad. When it was time to open the presents he opened them one at a time. The first present was not a bike. The second present was not a bike. The third present was the biggest one. Tim knew if the bike was going to be in any of the presents it was going to be in this box. Tim opened it and there was no bike inside. Just as Tim tried not to look too upset, his Dad brought in the biggest present of them all. His Dad had been hiding the present all along. Tim opened it and his new bike was inside the box. Tim put the bike together with his Dad's help.
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QUESTION:
Why was Tim sad?