 You can’t play tennis unless you know where the ball will be after it bounces. You can’t pass a basketball unless you understand how to angle a bounce so that it goes where you want it to go. As long as the court surface is smooth and flat, a ball’s bounce is very predictable. Its path depends on gravity and on the strength and direction of the force that sets the ball in motion. Thanks to high speed photography we can get a closer look at a bouncing ball. This is a multiple exposure photograph of a bouncing ball. It was taken in complete darkness with the camera shutter open while a high-speed flashing light, called a stroboscope or strobe, flashed 30 times a second. Each flash produced an image. Here’s what you can learn from this photo: The ball is moving fastest where the images are farthest apart and slowest where they are closest together. When the ball is falling, it speeds up. After it bounces and moves opposite the pull of gravity, it slows down at exactly the same rate as it sped up when it was falling until it stops for an instant and starts falling again. Each time it collides with the ground, some energy is lost. That’s why each bounce loses altitude. If the bounce were perfect, no energy would be lost, every bounce would be as high as the last and the ball would bounce forever. A strobe also captures the split second when a tennis ball is struck by a racket. The collision flattens the ball, and stretches the strings and distorts the frame of the racket, all in .005 seconds. If these objects kept their distorted shapes, most of the force of the collision would be absorbed. But they are elastic—they restore themselves to their original shapes after they collide. This restoring force is transferred to the ball to change its direction and help add to the speed of the athlete’s swing. The fastest serve leaves a racket at 130 miles an hour. In a rally, a ball-racket collision changes direction of the ball so it is not as fast as a serve, maybe 70 miles per hour. Since the distance between images made by a strobe tells how fast an object is moving, strobes are part of the instruments used to measure the speed of balls from a tennis racket and a baseball pitcher.  Photo credit: C. E. Miller, MIT In this MIT YouTube, a ball is dropped in front of a meter stick and lit by a strobe light. A long exposure photograph captures the position of the ball at each evenly spaced flash of light. The acceleration of the ball can then be measured from the photo.  Would you believe that you could throw an egg across the room without breaking it? Burn a candle underwater? Vicki Cobb's We Dare You! is a gigantic collection of irresistible, easy-to-perform science experiments, tricks, bets, and games kids can do at home with everyday household objects. Thanks to the principles of gravity, mechanics, fluids, logic, geometry, energy, and perception, kids will find countless hours of fun with the selections included in this book. If you would like to make a We Dare You Video, click here. Vicki Cobb is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more. MLA 8 Citation Cobb, Vicki. "A Bouncing Ball Like You've Never Seen." Nonfiction Minute, iNK Think Tank, 5 Feb. 2018, www.nonfictionminute.org/the-nonfiction-minute/ a-bouncing-ball-like-you've-never-seen. 
0 Comments
 The Revolutionary War should have won us independence from Britain. Britain’s Royal Navy didn’t care. In the early 1800’s it was busy fighting Napoleon but it had time to stop United States merchant ships on the high seas from trading with France or British colonies. It always needed sailors, so its officers seized our sailors, claiming they were Royal Navy deserters. We needed a more independent independence. President James Madison declared a second war against Britain in 1812. Britain declared an embargo, forbidding our ships to leave port. The Royal Navy had hundreds of big warships; we had six. To supplement our tiny Navy, the United States issued letters of marque, government licenses for privateers, private men o’war. The boldest and most successful privateer was Captain Thomas Boyle’s Chasseur. It was a new kind of vessel, a Baltimore pilot schooner, the fastest ship afloat. No sailboat can go directly into the wind. A square-rigged ship could manage to sail only 80° to the left or right of the wind’s direction. The Chasseur sailed 55° off the wind. Working into the wind by tacking (sailing to one side of the wind, then the other) she could go 10 miles to windward by sailing about 24 miles on diagonal courses. The Royal Navy’s square rigged men o’war would log almost 59 miles to reach the same point. Chasseur carried only 16 small cannon – no match for a big man o’war’s 30 to 40 guns. But Boyle had no intention of slugging it out. If a man o’war appeared, he would scamper away to windward. Chasseur couldn’t be caught. Boyle crossed the Atlantic and quickly took 18 British merchant ships. He was bold as a lion: he sent the last vessel back into port, so its captain could nail a proclamation to the door of Lloyd’s Coffee House, where London ship-insurers gathered. It was a politely worded embargo on all the British Isles – the same embargo Britain had attempted to force on the United States! Did Boyle succeed? Yes and no. Many British ships sailed, but fear of the Chasseur raised the price of insurance 300%! Some of Lloyd’s insurers wouldn’t write policies on ships voyaging near America. Our Navy was small but mighty: our six heavy frigates (including Constitution, “Old Ironsides”) beat many Royal Navy frigates ship-to-ship. Our combination of daring, skill and brass audacity won the War of 1812 against the largest navy in the world.   You know all about pirates. They were big guys with fancy hats, silk jackets, peg legs, and parrots cursing on their shoulders. They sailed big ships with brass guns and made lubbers walk the plank . . . right? Wrong! If you want to know what pirates were really like, then read Jan Adkin's book, What if You Met a Pirate? Click here for more information. Jan Adkins is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more. MLA 8 Citation Adkins, Jan. "The Man Who Held Up Britain." Nonfiction Minute, iNK Think Tank, 6 Feb. 2018, www.nonfictionminute.org/the-nonfiction-minute/ the-man-who-held-up-britain. 
Sonora Webster of Georgia adored horses. At age five, she even tried to swap her baby brother for one. Alas, grownups disapproved. At age nineteen, in 1923, Sonora went to the Savannah fair. There she saw a huge, deep pool of water beside a tower as tall as a four-story building. High atop was a lady in a red swimsuit and circle of spotlight. At her signal, a gray horse pounded up the ramps. The lady jumped on. The horse tossed its snowy mane and tail, leaped into space, and down into the pool! Glittering sheets of water SPLASHED the shrieking crowd. After a breathless moment, the horse rocketed UP from the depths, made its way to the arena, and the smiling lady dismounted. How Sonora clapped and cheered— for that beautiful horse! As it happened, the elderly showman who’d invented this amazing act needed extra ladies for his popular traveling shows. He advertised in the local paper:
“Likes horses?” THIS was the job for Sonora! As a trainer, “Doc” Carver was tough, but so was Sonora. She learned how to dive with all five of Doc’s horses, all carefully trained and cared-for. (Veterinarians checked often to see that they were.) In time, she made countless dives— and fell for Doc’s son Al. They married. After Doc died, Al took over the act, starring Sonora and the magnificent diving horses. Sonora met her day of destiny at Atlantic City’s Steel Pier, New Jersey’s great amusement park, July 14, 1931. She hopped astride Red Lips, her favorite horse. “Red” leaped from the tower. And somehow, Sonora hit the water face first, in the instant before she closed her eyes. They stung, but how could she know that the water collision had loosened her eyeballs’ retinas? She didn’t! Soon, despite medical treatments, 27-year-old Sonora saw her vision fading away. Could she accept that her diving days were over? She wouldn’t! She might have lost her sight, but her love and trust for her brave horses? Never! They’d keep flying through the air together, thrilling and splashing audiences for the next eleven years. Sonora Webster Carver told her story in her 1961 memoir, A Girl and Five Brave Horses, which inspired a 1991 film, Wild Hearts Can’t Be Broken. She died at age 99, in 2003.  Because world-traveling sharpshooter, William Frank Carver had been a dentist, such friends as “Buffalo Bill” Cody called him “Doc.” Wikimedia  Sonora and her brave diving partner. Equine Inc.  An exciting day at Steel Pier, Atlantic City, N.J. NJ com  Cheryl Harness is an illustrator as well an author, as seen by her delightful poster-like illustrations in Women Daredevils by Julia Cummins. The book offers mini biographies of ten fascinating women who risked their lives in the late 1800s and early 1900s to entertain the public. MLA 8 Citation Harness, Cheryl. "Splash!" Nonfiction Minute, iNK Think Tank, 17 Jan. 2018, www.nonfictionminute.org/the-nonfiction-minute/splash. 
After the bombing of Pearl Harbor on December 7, 1941, the lives of Japanese Americans instantly changed. As the US declared war on Japan, public scrutiny focused on the 120,000 Japanese Americans living along the Pacific Ocean. Would they help Japan if it attempted an invasion of the coast? A hateful, racist anti-Japanese American campaign swept the nation, and the government decided that for “public safety” Japanese Americans must be isolated in “internment” camps. With little warning, the roundups began. They were forced to sell their homes and possessions for whatever they could get and to give away their pets. They were allowed just two suitcases each as they boarded trains and buses to over-crowded assembly centers, where they waited for months in primitive conditions until the ten permanent camps were ready. Those camps were in isolated, inhospitable locations where the internees lived behind barbed wire, guarded by armed soldiers. Each family was assigned one room in a flimsy wooden barrack furnished only with iron cots. Everyone waited in long lines to use the restrooms and to eat. The children attended schools that were started in the camps. But jobs were scarce and adults had little to do. While they could have sunk into despair, nearly all Japanese Americans wanted America to win the war, and if their confinement helped the war effort, they decided to cooperate and make the best of it. To stay busy they organized scout troops and baseball teams. They hosted talent contests, movie nights, dances, festivals, and celebrations. They started newspapers, libraries, poetry clubs, choirs, bands and orchestras. They took up woodworking and sewing and planted Victory Gardens. In some camps internees were allowed to grow crops to supplement their government surplus food. Each morning they saluted the flag and said the Pledge of Allegiance. Many participated in Red Cross blood drives and knitted socks and scarves to send to soldiers. The young men from the camps who served in the war distinguished themselves with their bravery and helped ensure an Allied victory. After the war, Japanese Americans began the difficult task of rebuilding their lives. Many had lost all their belongings and could not find jobs. Worst of all was the shame they felt over their country’s distrust of them. But they had proved their loyalty. And in spite of this terrible injustice, they raised their children to be good Americans.    Andrea Warren is the author of nine books of nonfiction for young readers and young adult readers. Each centers on young people who have faced grave challenges in difficult periods of history. Her latest, Enemy Child: The Story of Norman Mineta, a Boy Imprisoned in a Japanese American Internment Camp During World War II, published by Holiday House, received starred reviews in School Library Journal and The Horn Book. It was selected as a 2019 Best Book by School Library Journal and is the recipient of the Bank Street College best nonfiction award. It has also has been honored by the Library of Congress and the Smithsonian’s National Museum of American History. Warren is a previous winner of the Horn Book Award and the Sibert Honor Award. You can read Vicki Cobb's review here. 
In October, 1891, 23-year-old Manya Sklowdowska arrived in Paris to attend the Sorbonne, France’s great university. She had saved money, working as a governess to get there. She was determined to make the most of her studies in science and math. Right away she was noticed partly because she was Polish, although she had changed her first name to a French version, Marie, to fit in better. She always sat in the front row of all her classes because her French was not yet fluent and she didn’t want to miss anything. She also was one of only a few female students. In a university full of smart people, she worked hard to excel. She ultimately finished first in her class and went on to make major scientific discoveries. What made Marie so single-minded and determined? Behind it all was a great love for science, a love she shared with her husband, Pierre Curie, whom she met in 1894. At that time, science was uncovering unimaginable truths in chemistry and physics. New discoveries were being made at a breath-taking pace. Science was like a game and it attracted many players. Why? 1. There was a Nobel Prize for winners, those who discovered a big idea about the natural world. There was only one nature to discover but people came at it from many directions. 2. It was collaborative—scientists shared their discoveries by publishing papers. 3. It was competitive—the papers described procedures so that scientists could check each other’s work. It kept everyone honest. The best work got the most attention. 4. The discoveries could be applied to solve problems for people. X-rays, light bulbs, phonographs, photographs, movies, and telephones would not have been possible without science. 5. The biggest prize was the idea of the atom and its structure. Many scientists contributed to modern atomic theory, including Marie. Marie Curie won the Nobel Prize twice for her work. At a time when women didn't even have the right to vote, she was a working mother of two daughters, a single mother after she was widowed in 1906, the founder of the Radium Institute for research and she brought the x-ray to the battlefield in WWI. She believed that science could save the world, that scientific discoveries belonged to everyone. And she refused to benefit financially from her discoveries. She lived by the highest principles of honesty and integrity. She was a true champion of the science game.
 DK Biography: Marie Curie tells the story of the discoverer of radium, from her childhood in Warsaw, to her experiments with radioactivity in Paris, to her recognition as one of the preeminent scientists of her time. Filled with archival photographs and amazing fact boxes, this biography paints Marie Curie as the brave and brilliant scientist that she was. Vicki Cobb is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more. MLA 8 Citation Cobb, Vicki. "Marie Curie: An Elite Player in the Science Game." Nonfiction Minute`, iNK Think Tank, 30 Jan. 2018, www.nonfictionminute.org/ the-nonfiction-minute/Marie Curie-An-Elite-Player-in-the-Science-Game.  |
NEW!
For Vicki Cobb's BLOG (nonfiction book reviews, info on education, more), click here: Vicki's Blog *NEWSFLASH *
The NCSS-CBC Notable Social Studies Committee is pleased to inform you that 30 People Who Changed the World has been selected for Notable Social Studies Trade Books for Young People 2018, a cooperative project of the National Council for the Social Studies (NCSS) & the Children’s Book Council Categories
All
Archives
April 2020
|
RSS Feed
