Writing Activity
filename: objects1
Follow essay submission procedure
Write your answer in 150 words. Group information and organize the text effectively, using cause and effect links where appropriate.
The diagrams below show stages in the development of the aeroplane since the first powered flight in 1903.
Summarize the information by selecting and reporting the main features and make comparisons where relevant.
Guide questions:
a. In what order are the three objects?
b. What design features do the three have in common?
c. Which features distinguish each object from the one before? What is the purpose of each of these differences?
d. What is the practical effect of each difference? What trends do you notice?
Answer key
a The objects are in chronological order, covering a century.
b The common design features are: wings for lift, power source(s) for thrust, tail, space for crew/passengers.
c Douglas DC-3: This plane has two engines, instead of the one in the Wright Flyer, to provide more power. The engines are located on the wings, not inboard, to provide more stability. Boeing Airbus A30: This plane has four engines instead of two passenger decks instead of one, to provide more space for passengers.
d Practical effects: Planes fly at higher altitudes, and at faster speeds, and more people travel by plane than before.
Trends: planes get longer, wingspans wider, engines more numerous and powerful.
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