You can make an airfoil using a piece of notebook paper and a book. Place the paper between two pages of the book, leaving one end of paper hanging out. Close the book. When you direct air over the top of the paper, it rises upward, illustrating lift.Continue Reading
Move air over your airfoil by blowing on it or by moving the book quickly through the air. Either way, you see the paper rise. This is due to the shape of the airfoil. This airfoil is simple, but it uses the same principles employed in making airplane wings and propellers.
When air is in motion, some passes over the top of the airfoil, and some passes under the bottom. Because of its shape, as air passes above and below an airfoil, the air at the top speeds up, which decreases the air pressure in that area. The air below maintains a constant speed, and so has a higher pressure. This pressure differential illustrates Bernoulli's principle. As air moves more quickly, there is a greater difference in air pressure. When the differential is high enough, lift is achieved, and the piece of notebook paper ? or the wing of an airplane ? rises into the air.Learn more about Toys
Some suggestions for choosing a name include naming the elf after a favorite candy, a name of a character from a favorite book, a word in a favorite song or a word unique to the family. Creativity and humor are common elements.Full Answer >
One way to come up with a creative writing topic is to take a small, insignificant scene from a book or movie and use that as the opening for your next writing piece. Start from there and create a whole story or poem based off that original seed. Another way to create a topic is to use junk mail. WritersDigest.com suggests using a person who is mentioned in junk mail to create a protagonist or antagonist in your story.Full Answer >
The theme in a literary book or piece of writing is often the moral of the story or the overall message. Theme is not always directly stated and may appear more as a lesson that readers must think critically about when reading.Full Answer >
The book of Judas, also known as the "Gospel of Judas," was discovered in the 1970s in a cave in Egypt as a piece of papyrus. The "lost" text portrays Judas, the apostle who betrayed Jesus to Pontius Pilate for 30 pieces of silver, as a hero who was fulfilling the will of God before the crucifixion of Jesus.Full Answer >