Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Input: Consider Input: Context: Assume that a school bus, like the one in Figure 12.2, passes by as you stand on the sidewalk. Its obvious to you that the bus is moving. It is moving relative to you and the trees across the street. But what about to the children inside the bus? They arent moving relative to each other. If they look only at the other children sitting near them, they will not appear to be moving. They may only be able to tell that the bus is moving by looking out the window and seeing you and the trees whizzing by. This example shows that how we perceive motion depends on our frame of reference. Frame of reference refers to something that is not moving with respect to an observer that can be used to detect motion. For the children on the bus, if they use other children riding the bus as their frame of reference, they do not appear to be moving. But if they use objects outside the bus as their frame of reference, they can tell they are moving. What is your frame of reference if you are standing on the sidewalk and see the bus go by? How can you tell the bus is moving? The video at the URL below illustrates other examples of how frame of reference is related to motion. MEDIA Click image to the left or use the URL below. URL: Did you ever go to a track meet like the one pictured in Figure 12.3? Running events in track include 100-meter sprints and 2000-meter races. Races are named for their distance. Distance is the length of the route between two points. The length of the route in a race is the distance between the starting and finishing lines. In a 100-meter sprint, for example, the distance is 100 meters. The SI unit for distance is the meter (1 m = 3.28 ft). Short distances may be measured in centimeters (1 cm = 0.01 m). Long distances may be measured in kilometers (1 km = 1000 m). For example, you might measure the distance a frogs tongue moves in centimeters and the distance a cheetah moves in kilometers. Maps can often be used to measure distance. Look at the map in Figure 12.4. Find Mias house and the school. You can use the map key to directly measure the distance between these two points. The distance is 2 kilometers. Measure it yourself to see if you agree. Things dont always move in straight lines like the route from Mias house to the school. Sometimes they change direction as they move. For example, the route from Mias house to the post office changes from west to north at the school (see Figure 12.4). To find the total distance of a route that changes direction, you must add up the distances traveled in each direction. From Mias house to the school, for example, the distance is 2 kilometers. From the school to the post office, the distance is 1 kilometer. Therefore, the total distance from Mias house to the post office is 3 kilometers. You Try It! Problem: What is the distance from the post office to the park in Figure 12.4? Direction is just as important as distance in describing motion. For example, if Mia told a friend how to reach the post office from her house, she couldnt just say, "go 3 kilometers." The friend might end up at the park instead of the post office. Mia would have to be more specific. She could say, "go west for 2 kilometers and then go north for 1 kilometer." When both distance and direction are considered, motion is a vector. A vector is a quantity that includes both size and direction. A vector is represented by an arrow. The length of the arrow represents distance. The way the arrow points shows direction. The red arrows in Figure 12.4 are vectors for Mias route to the school and post office. If you want to learn more about vectors, watch the videos at these URLs: (5:27) MEDIA Click image to the left or use the URL below. URL: You Try It! Problem: Draw vectors to
Question: change in position

Output: motion

Input: Consider Input: Context: The movie is based on the true story of two British athletes competing in the 1924 Summer Olympics in Paris. Englishman Harold Abrahams (Ben Cross), who is Jewish, overcomes anti-Semitism and class prejudice in order to compete against the "Flying Scotsman", Eric Liddell (Ian Charleson), in the 100 metre race.Opening in 1919 England, Harold Abrahams enters Cambridge University, where he meets with anti-Semitism from the staff, but enjoys participating in the Gilbert and Sullivan theatre club. He becomes the first person to ever complete the Trinity Great Court run: running around the court in the time it takes for the clock to strike 12. Abrahams achieves an undefeated string of victories in various national running competitions. Although focused on his running, he falls in love with a famous Gilbert and Sullivan soprano, Sybil (Alice Krige).Meanwhile in Scotland, Eric Liddell (Ian Charleson), born in China of Scottish missionary parents, is in Scotland. His devout sister Jennie (Cheryl Campbell) disapproves of Liddell's plans to pursue competitive running. But Liddell sees running as a way of glorifying God before returning to China to work as a missionary.Abrahams and Liddell meet for the first time in London in June 1923 when they first race against each other in a British open. Liddell beats Abrahams who takes it extremely badly. But Sam Mussabini (Ian Holm), a professional trainer whom Abrahams had approached earlier, offers to take him on to improve his technique. This attracts criticism from the Cambridge college masters (John Gielgud and Lindsay Anderson). In their meeting with Abrahams, the Cambridge masters allege it is ungentlemanly for an amateur to "play the tradesman" by employing a professional coach. Abrahams realizes this is a cover for their anti-Semitism and class entitlement, and dismisses their concern.Meanwhile, when Liddell accidentally misses a church prayer meeting because of his running, his sister Jennie upbraids him and accuses him of no longer caring about God. But Eric tells her that though he intends to eventually return to the China mission, he feels divinely inspired when running, and that not to run would be to dishonor God: "I believe that God made me for a purpose. But He also made me fast, and when I run, I feel His pleasure."The two athletes, after over a year of training and racing, are accepted to represent Great Britain in the 1924 Summer Olympics in Paris, France. Also accepted are Abrahams' Cambridge buddies, Lord Andrew Lindsay (Nigel Havers), Aubrey Montague (Nicholas Farrell), and Henry Stallard (Daniel Gerroll) whom join the UK team.While boarding the boat to Paris for the Olympics, Liddell learns from the newspapers that the event for his 100 meter race will be on a Sunday. Liddell refuses to run the race despite strong pressure from the Prince of Wales (David Yelland) as well as the head of the British Olympic committee, Lord Cadogan (Patrick Magee) because Liddell's Christian convictions prevent him from running on the Christian Sabbath (Sunday).Hope appears in the form of Liddell's teammate Lord Andrew Lindsay. Having already won a silver medal in the 400 meter hurdles, Lindsay proposes to yield his place in the 400 meter race on the following Tuesday to Liddell. Liddell gratefully agrees. His religious convictions in the face of national athletic pride make headlines around the world.Liddell delivers a sermon at the Paris Church of Scotland that Sunday, and quotes from Isaiah 40, verse 31:"But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and be not weary; and they shall walk, and not faint."Meanwhile, Abrahams is badly beaten by the heavily favored and more experienced United States runner Charles Paddock (Dennis Christopher) in the 200 meter race who wins the gold medal, while Abrahams takes a second place silver medal. Abrahams knows that his last chance for a gold medal will be the 100 meter run. He competes in the 100 meter sprint and wins, beating Paddock and the rest of the Americans.On Tuesday, just before Liddell's race, the American coach remarks to his runners that Liddell has little chance
Question: Who was trainer?

Output: mussabini

Input: Consider Input: Context: A magnet is an object that attracts certain materials such as iron. Youre probably familiar with common bar magnets, like the one shown in the Figure 1.1. Like all magnets, this bar magnet has north and south magnetic poles. The red end of the magnet is the north pole and the blue end is the south pole. The poles are regions where the magnet is strongest. The poles are called north and south because they always line up with Earths north-south axis if the magnet is allowed to move freely. (Earths axis is the imaginary line around which the planet rotates.) Q: What do you suppose would happen if you cut the bar magnet pictured in the Figure 1.1 along the line between the north and south poles? A: Both halves of the magnet would also have north and south poles. If you cut each of the halves in half, all those pieces would have north and south poles as well. Pieces of a magnet always have both north and south poles no matter how many times you cut the magnet. The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other. A magnet can exert force over a distance because the magnet is surrounded by a magnetic field. In the Figure 1.2, you can see the magnetic field surrounding a bar magnet. Tiny bits of iron, called iron filings, were placed under a sheet of glass. When the magnet was placed on the glass, it attracted the iron filings. The pattern of the iron filings shows the lines of force that make up the magnetic field of the magnet. The concentration of iron filings near the poles indicates that these areas exert the strongest force. You can also see how the magnetic field affects the compasses placed above the magnet. When two magnets are brought close together, their magnetic fields interact. You can see how they interact in the Figure 1.3. The lines of force of north and south poles attract each other whereas those of two north poles repel each other.
Question: a magnets force is
Output: exerted over a distance.