Mechanical energy is a combination of the energy of motion or position. This type of energy describes objects that are moving or could move. A moving ball can have energy from motion. An arrow can also have the energy of motion. Both are types of mechanical energy. Can you think of some other examples? Where does the energy of motion come from? It comes from the energy created by position. This energy is stored energy. This means it is not moving yet, but it has the potential to move. How can you store energy? The arrow gains energy from the drawn bow. As the arrow is released, the bow releases its stored energy and puts the arrow into motion. Can you think of some other ways to store energy using position?
What question would one ask from this paragraph?
Answer: Why is it possible for a moving ball to still have energy of position?

Billy and Sally are brother and sister. Billy is seven and Sally is eight. Their mother, Deborah, likes to have Billy and Sally dress up in costumes and play a game where they are answering the telephone. Usually when they play the game, Billy answers the telephone in a loud voice, and Sally answers the telephone in a quiet voice. On Tuesdays, Billy answers in a quiet voice, and Sally answers in a loud voice. On Fridays, Billy answers in a loud voice and Sally in a quiet voice. Billy has blonde hair. Sally has brown hair. Deborah has blonde hair, and Billy and Sally's father, Bob, has brown hair. He tells them to eat lettuce every time that he sees them, so that they grow big and strong like he is. Deborah likes to add some sugar with the lettuce so that Billy and Sally know what it is like to have sweet tastes in their life. One day, a Wednesday, Billy throws some lettuce into Sally's hair. Deborah laughs an grabs some straw from their farm and puts it in Billy's hair. Billy and Sally live on a farm. They have a goat, named Joey, and a duck, named Quack. They sometimes play a game with the goat where they chase him around the farm. Other times, they play a game with Quack where they wave at Quack and laugh. They have a fun life growing up on the farm.
What question would one ask from this paragraph?
Answer: What type of voice does Sally use while playing?

Reducing resource use means just what it says using fewer resources. There are lots of ways to reduce our use of resources. Buy durable goods. Choose items that are well made so they will last longer. Youll buy fewer items in the long run, so youll save money as well as resources. Thats a win-win! Repair rather than replace. Fix your bike rather than buying a new one. Sew on a button instead of buying a new shirt. Youll use fewer resources and save money. Buy only what you need. Dont buy a gallon of milk if you can only drink half of it before it spoils. Instead, buy a half gallon and drink all of it. You wont be wasting resources (or money!) Buy local. For example, buy local produce at a farmers market, like the one in Figure 2.20. A lot of resources are saved by not shipping goods long distances. Products bought at farmers markets use less packaging, too! About a third of what we throw out is packaging.
What question would one ask from this paragraph?
Answer: How is it a win-win to buy durable goods?

These experiments in political Islam faltered during the 1990s: the Iranian revolution lost momentum, prestige, and public support, and Pakistan's rulers found that most of its population had little enthusiasm for fundamentalist Islam. Islamist revival movements gained followers across the Muslim world, but failed to secure political power except in Iran and Sudan. In Algeria, where in 1991 Islamists seemed almost certain to win power through the ballot box, the military preempted their victory, triggering a brutal civil war that continues today. Opponents of today's rulers have few, if any, ways to participate in the existing political system. They are thus a ready audience for calls to Muslims to purify their society, reject unwelcome modernization, and adhere strictly to the Sharia. Social and Economic Malaise In the 1970s and early 1980s, an unprecedented flood of wealth led the then largely unmodernized oil states to attempt to shortcut decades of development. They funded huge infrastructure projects, vastly expanded education, and created subsidized social welfare programs. These programs established a widespread feeling of entitlement without a corresponding sense of social obligations. By the late 1980s, diminishing oil revenues, the economic drain from many unprofitable development projects, and population growth made these entitlement programs unsustainable. The resulting cutbacks created enormous resentment among recipients who had come to see government largesse as their right. This resentment was further stoked by public understanding of how much oil income had gone straight into the pockets of the rulers, their friends, and their helpers. Unlike the oil states (or Afghanistan, where real economic development has barely begun), the other Arab nations and Pakistan once had seemed headed toward balanced modernization. The established commercial, financial, and industrial sectors in these states, supported by an entrepreneurial spirit and widespread understanding of free enterprise, augured well. But unprofitable heavy industry, state monopolies, and opaque bureaucracies slowly stifled growth. More importantly, these state-centered regimes placed their highest priority on preserving the elite's grip on national wealth. Unwilling to foster dynamic economies that could create jobs attractive to educated young men, the countries became economically stagnant and reliant on the safety valve of worker emigration either to the Arab oil states or to the West. Furthermore, the repression and isolation of women in many Muslim countries have not only seriously limited individual opportunity but also crippled overall economic productivity. By the 1990s, high birthrates and declining rates of infant mortality had produced a common problem throughout the Muslim world: a large, steadily increasing population of young men without any reasonable expectation of suitable or steady employment-a sure prescription for social turbulence.
What question would one ask from this paragraph?
Answer:
What year did high birthrates and declining rates of infant mortality begin?