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Follow the directions on the template to cut out and fold your whirlybird.
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If you do not have access to a printer, you can download the file and open it on your computer, then use a pencil and ruler to draw the whirlybird shape on a piece of paper, based on the dimensions in the template. Download and print the whirlybird template from this pdf.A safe, high place from which to drop the whirlybirds (You could have an adult stand on a chair or stepping stool, for example.).Computer with access to a printer to print the whirlybird template (If you do not have access to a printer, you can use a ruler and pencil to draw your own whirlybird template based on the online one.).Do you think adding paper clips as weights to the whirlybird will make it fall faster? Try this activity to find out!
So, it will fall much slower than if you crumpled up the same piece of paper and dropped it. This generates additional lift that slows the whirlybird even as it drops. Due to its special shape, however, the blades will still spin as it falls. In this activity you will build a simple paper helicopter called a "whirlybird." Unlike a real helicopter, the whirlybird does not have a motor to make its blades spin. Aircraft such as helicopters with spinning blades are called rotary wing, unlike traditional airplanes, which are fixed wing. Helicopters stay in the air using spinning blades that are used to generate "lift." With enough of it, a craft can overcome the force of gravity, which pulls the object down toward Earth. And you will learn a little bit about what keeps these amazing vehicles aloft. Well, yes, in the absence of punctuation, it is that’s why we invented the stuff.Have you ever seen a helicopter flying through the air? Have you ever wondered how they fly-or if you could try flying one yourself? This fun activity will help you get started at home building a simple paper helicopter. Ultimately, 8 ÷ 2(2+2) is less a statement than a brickbat it’s like writing the phrase “Eats shoots and leaves” and concluding that language is capricious. They are the double-yellow line down the center of the road - an unending equals sign - and a joint agreement to understand one another, work together, and avoid colliding head-on. For the rest of us, the intricacies of PEMDAS are less important than the larger lesson that conventions have their place.
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Likewise, it’s essential that everyone writing software for computers, spreadsheets and calculators knows the rules for the order of operations and follows them. It doesn’t matter which convention is adopted, as long as everyone follows it. The same goes if everyone else is driving on the left, as in the United Kingdom. If everyone else is driving on the right side of the road (as in the U.S.), you would be wise to follow suit. We know this whenever we take to the highway. But now, having been enlightened by some of my computer-oriented friends on Twitter, I’ve come to appreciate that conventions are important, and lives can depend on them. The last time this came up on Twitter, I reacted with indignation: It seemed ridiculous that we spend so much time in our high-school curriculum on such sophistry. We would insert parentheses to indicate our meaning and to signal whether the division should be carried out first, or the multiplication.
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No professional mathematician would ever write something so obviously ambiguous. Furthermore, in my experience as a mathematician, expressions like 8÷2×4 look absurdly contrived. Now realize, following Aunt Sally is purely a matter of convention. Still others tell their pupils to remember the little ditty, “Please excuse my dear Aunt Sally.” Other teachers use an equivalent acronym, BODMAS: brackets, orders, division and multiplication, and addition and subtraction. To help students in the United States remember this order of operations, teachers drill the acronym PEMDAS into them: parentheses, exponents, multiplication, division, addition, subtraction.
Read more writing in The Times from Steven Strogatz about math
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