You know that friction also causes heat. Think about when you rub your hands together. It is friction that makes them warm. But why does this happen? Friction causes the molecules on rubbing surfaces to move faster. Faster moving particles have more heat energy. Heat from friction can be useful. Can you think of other places where you might find friction? Friction also lets you light a match. Heat from friction can also cause problems. It can cause a car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts. This coating of oil makes them slippery. When things are slippery there is less friction. Have you ever seen a sign that says, slippery when wet? This too has to do with friction. Water, like oil, can reduce friction. The wet surface may allow your shoes to slide more easily.

Question: "What can happen in a car when there is too much friction?"

OPTIONS:
- no
- yes

Answer: "The car can overheat"

Response: yes

Recommendation: Congressional oversight for intelligence-and counterterrorism-is now dysfunctional. Congress should address this problem. We have considered various alternatives: A joint committee on the old model of the Joint Committee on Atomic Energy is one. A single committee in each house of Congress, combining authorizing and appropriating authorities, is another. The new committee or committees should conduct continuing studies of the activities of the intelligence agencies and report problems relating to the development and use of intelligence to all members of the House and Senate. We have already recommended that the total level of funding for intelligence be made public, and that the national intelligence program be appropriated to the National Intelligence Director, not to the secretary of defense. We also recommend that the intelligence committee should have a subcommittee specifically dedicated to oversight, freed from the consuming responsibility of working on the budget. The resolution creating the new intelligence committee structure should grant subpoena authority to the committee or committees. The majority party's representation on this committee should never exceed the minority's representation by more than one. Four of the members appointed to this committee or committees should be a member who also serves on each of the following additional committees: Armed Services, Judiciary, Foreign Affairs, and the Defense Appropriations subcommittee. In this way the other major congressional interests can be brought together in the new committee's work. Members should serve indefinitely on the intelligence committees, without set terms, thereby letting them accumulate expertise. The committees should be smaller-perhaps seven or nine members in each house-so that each member feels a greater sense of responsibility, and accountability, for the quality of the committee's work. The leaders of the Department of Homeland Security now appear before 88 committees and subcommittees of Congress. One expert witness (not a member of the administration) told us that this is perhaps the single largest obstacle impeding the department's successful development. The one attempt to consolidate such committee authority, the House Select Committee on Homeland Security, may be eliminated. The Senate does not have even this. Congress needs to establish for the Department of Homeland Security the kind of clear authority and responsibility that exist to enable the Justice Department to deal with crime and the Defense Department to deal with threats to national security.

Question: "What are some of the problems Homeland Security faces right now?"

Response: "They don't have the authority to actuate change"
OPTIONS:
- no
- yes

A: no

Problem: Electric charge is a physical property. It occurs between particles or objects. It causes them to attract or repel each other. They do not even have to touch. This is unlike the typical push or pull you may be familiar with. All electric charge is based on the protons and electrons in atoms. A proton has a positive electric charge. An electron has a negative electric charge. Forces on Charged Objects Most atoms are balanced electrically. They have the same number of positive and negative charges. Therefore, the number of protons equals the number of electrons. Neutrons do not matter as they have no charge. When an object loses some electrons, it becomes positively charged. There are now more protons than electrons inside the atom. The lost electrons may remain free. Or, they may attach to another object. The new object now has more electrons than protons. It then becomes negatively charged.

Question: "What kind of charge does an atom with more electrons than protons have?"

Answer: "Electrons have a negative charge"

OPTIONS:
- no
- yes
Answer: yes

Question:
Flowing water causes sediment to move. Flowing water can erode both rocks and soil. You have already learned that materials can dissolve in water. With enough time, even rocks can be dissolved by water. This process happens really slowly. It may take over a million years to dissolve a rock. It doesnt matter how big the rock is. With enough time, flowing water can dissolve it. Moving water also has the ability to move small pieces of rock and soil. How can water move a rock? Doesnt it need energy? Of course, water gets its energy because it is moving. Moving water has kinetic energy. Things that have more energy can do more work. When water stops moving it will have no energy. It will no longer be able to move the rock and soil. When this happens the rock and soil will settle to the bottom of the calm water. Scientists call this process deposition. After reading the above, is "Yes" the correct answer to the question "Does moving water have kinetic energy?"? OPTIONS:
- no
- yes

Answer:
yes

Earths magnetic field helps protect Earth and its organisms. It protects us from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles. This is where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole. Knowing this helps them tell direction. Many animals have natural 'compasses' that work just as well. Birds like the garden warbler in Figure 1.36 use Earths magnetic field. They use it to guide their annual migrations. Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern.

Question: "Why do few organisms live on the North and South poles?"

OPTIONS:
- no
- yes

Answer: "There is very little sunlight"

Response:
no