The Master Chef of Kids’ Hands-on Science
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.
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/
Carla Killough McClafferty
illuminating lives from the past, impacting lives in the present
Every fall, the smell of popcorn and hot dogs fills the air as fans make their way into stadiums to cheer for the home team. Football is such a big part of our world that it is hard to imagine life in America without the sport.
But in 1905, football was nearly cancelled—forever. By the end of the year, nineteen boys had died as a result of playing football. Because of these deaths and the many injuries that occurred during the season, Columbia University in New York City decided they would no longer have a football team. Other colleges considered banning their football teams too.
At the time, Teddy Roosevelt was President of the United States. He was a football fan and believed young Americans should live a “strenuous life” filled with hard work and physical activity. President Roosevelt did not want America to lose football, but he also understood the game needed to be less brutal that it was. So he called a meeting between the coaches of Harvard, Yale and Princeton on October 9, 1905. The coaches joined Roosevelt at the White House to discuss how to make football safer.
As the season drew to a close, the future of football was still in question. In December Walter Camp, the man who invented American football, led a group called the Intercollegiate Rules Committee to make rule changes. As part of the changes, the Committee wanted officials to enforce rules against kneeing, kicking and punching on the field. For the first time football would include a forward pass. They also changed the distance it would take for a first down—it had been five yards, but the new rules changed it to ten yards.
The rule changes of 1905 are still part of football today, and so is Walter Camp’s Committee. Today it is known as the National Collegiate Athletic Association (NCAA) which still governs the rules of college football.
Did you know that football was almost banned in 1905 because nineteen players were dead and countless others injures? Carla McClafferty has written a book that balances the love of America’s most popular spectator sport with a hard look at its costs for players. This is a must read for players and coaches.
Carla McClafferty 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
McClafferty, Carla Killough. "The Near-Death Experience of Football."
Nonfiction Minute`, iNK Think Tank, 1 Feb. 2018,
The Running Encyclopedia
Billy Mills was just a face in the crowd of nearly 30 runners at the 10,000-meter run at the 1964 Olympic Games in Tokyo, Japan. His best time was nearly a minute slower than the race favorites.
Part-Lakota Sioux Indian, Mills was a scrawny kid, who had grown up in poverty and racial bias. Whites regarded him as an Indian. Indians sneered that he was part-white and therefore not one of them.
His father had encouraged the boy to envision a better life: “You have to look deeper, way below the anger, the hurt, the hate, the jealousy, the self-pity, way down deeper where the dreams lie, son. Find your dream.”
Mills began finding his dream when he discovered his talent for running. He earned an athletic scholarship to the University of Kansas. Then he qualified for the U.S. Olympic team.
Still, no one expected anything of him. He asked for shoes from the company that outfitted American runners. Sorry, he was told. We only give shoes to potential medalists. You don’t qualify.
Mills kept a diary. Six weeks before the 10,000 meter race, he wrote “I’m in great shape….I’m ready for a 28:25 [twenty-eight minutes, twenty-five seconds].” He had never run that fast. Nor had any American. Nor anyone in any previous Olympics.
The gun sounded. As each of the 25 laps rolled by, more and more runners fell off the pace. At the start of the final lap, Mills was one of three runners still in contention. As they rounded the first turn, Australian Ron Clarke shoved Mills out into the third lane. Mohamed Gammoudi of Tunisia took advantage of the opening and pushed his way between the other two, knocking Mills off balance for a moment. As the runners headed down the final straight, television cameras showed a tight battle between Gammoudi and Clarke. Mills was nowhere to be seen.
Suddenly the television announcer screamed “Look at Mills! Look at Mills!” Mills bounded back into the picture, passing Clarke and then Gammoudi almost as if they were standing still. He maintained his pace to the finish line, five yards ahead of Gammoudi and ten in front of Clarke. His time of 28 minutes, 24.4 seconds was virtually identical to what he had visualized. He remains the only American to win the 10,000 meters at the Olympics.
Mills crossing the finish line in the 1964 Olympics.
Watch Mills run the final lap
Jim Whiting is a walking encyclopedia. He has written more than 180 (count 'em!) books on many subjects. You can learn more about him here.
MLA 8 Citation
Whiting, Jim. "No Shoes for You." Nonfiction Minute, iNK Think Tank, 21 Sept. 2017, www.nonfictionminute.org/the-nonfiction-minute/no-shoes-for-you.
Nonfiction is the New Black
French aristocrat Baron Pierre de Coubertin (1863–1937) was a scholar of ancient Greece. With the sting of France’s defeat in the Franco-Prussian War in 1871 in his mind, he believed that strong young men were better able to fight wars. He especially admired the English school system, in which academic learning and physical fitness worked side by side. His studies convinced him that this harmony of mind and body originated in the gymnasia of ancient Greece.
This harmony reached its highest level in the Olympics, which originated in the Greek village of Olympia in 776 BCE. They continued every four years until being suppressed in 393 CE as a pagan ritual. The Games began with a single event—a sprint of about 200 yards—and eventually encompassed a wide variety of sports. The Games were so prestigious among the Greeks that winners were set up for the rest of their lives.
To reintroduce this sporting ideal into the modern world, de Coubertin proposed reviving the Olympics. Olympia was too small and too remote to serve as the site, so de Coubertin and his associates chose Athens, the Greek capital and largest city, instead.
Two hundred forty one athletes from 14 nations descended on Athens in April 1896 to compete in nine sports: track and field, cycling, fencing, gymnastics, shooting, swimming, tennis, weightlifting, and wrestling. Only track and wrestling had been part of the ancient Olympics.
Another event not in the original Games was the marathon run. Organizers wanted a signature event to recall the glory of ancient Greece. In 490 BCE, a messenger supposedly ran from the plain of Marathon to Athens to announce a stunning victory over a much larger invading Persian army. So the route of the first-ever “marathon race” was about 22 miles, from the battlefield to the Olympic Stadium. The winner, Spiridon Loues, had done no formal training. His occupation of water carrier in the hills overlooking Athens gave him considerable stamina and he became an instant national hero. A prominent Greek industrialist reportedly offered his daughter in marriage. Loues was already engaged. He settled for a horse and cart for his business instead.
Today the Olympics are regarded as the premier sporting event in the world. In the 2012 Olympics in London, England, 10,768 athletes from 204 nations competed in 26 sports. Nearly 4,800 were women—something that never happened in the original Olympics. All the entrants then were men.
Jim Whiting has written a book on the ancient Greek writer Herodotus, who is known as the father of history. Herodotus provides most of what is known about one of the most important periods in world history. It began in 490 BCE. An invading Persian army was defeated at the Battle of Marathon. It concluded just over ten years later with Greek victories at Salamis and Plataea. The triumph allowed the Greeks to develop ideas and institutions in politics, economics, science, and even sports. These are the bases for how the Western world thinks and acts today. For more information, click here.
MLA 8 Citation
Whiting, Jim. "Reviving the Olympics." Nonfiction Minute, iNK Think Tank, 20
Feb. 2018, www.nonfictionminute.org/the-nonfiction-minute/
When you think of the Olympics you think of the sports: Speed skating, Bobsled. Snowboarding. Track, Gymnastics. Swimming. Tennis. Just to name a few.
You may even think about some of the Olympians: Snowboarders Shaun White and Kelly Clark. Speed skater Apollo Ohno. Swimmers Michael Phelps and Katie Ledecky. Or even gymnast Simone Biles and sprinter Usain Bolt.
But do you ever think about the science behind each sport? You should. Math and physics play a huge part in every part in the Olympics. Think about it. One of the most basic forces, friction, is a factor in everything an athlete does. What is friction? It’s the force that pushes back on you as you swim through the water or run through the air. Friction not only affects an athlete, but also the object they may be throwing, hitting, or kicking—like a baseball, a tennis ball, or a soccer ball.
Movement of any kind deals with physics of air flow, engineering design, and (unfortunately) sometimes collision. The verdict? Athletes need to know a LOT of science to do well in their sports.
Science is not just found in the activities themselves but also in the equipment they use and clothes they wear. Most of today’s superstar athletes rely on clothing and equipment enhanced with nanotechnology. What is nanotechnology? Nanotechnology is the science of the super small—microscopic even. One nanowire is 1,000 time thinner than a single strand of human hair. Now that is SMALL! Materials made with nanotechnology are stronger, more durable, and yet lighter and more flexible.
Nanotechnology produces swimsuits that allow the athlete to glide through the water faster, golf clubs that hit the ball farther, and tennis rackets that flex more easily to provide the hard smash across the net. This innovative new technology has already been used in the Olympics. In 2008, swimmers Michael Phelps and Natalie Coughlin wore swimsuits that were created with nanofibers. These nanofibers are woven tightly so that the swimmer’s bodies become more streamlined (like a shark!) allowing them to glide through the water faster. In the 2014 winter Olympics, the U.S. speed skaters wore specially created vented suits (like the swimsuits—to reduce drag), and in the 2018 winter Olympics, the USA Snowboarders will be wearing snow gear inspired by the space program.
Nanotechnology is a cutting-edge science that is changing the world of sports—and in particular the Olympics— as we know it. Will you make nanotechnology part of your game?
The LZR Racer is a line of completion swimsuits manufactured by Speedo using a high-technology swimwear fabric. In March 2008, athletes wearing the LZR Racer broke 13 swimming world records. Much like other suits used for high competition racing, LZR Racers allow for better oxygen flow to the muscles, and hold the body in a more hydrodynamic position, while repelling water and increasing flexibility. Kathy Barnstorff via Wikimedia Commons
Serena Williams uses a nanotech racket and Phil Mickelson uses nanotech technology in his game. Seems to be going well for both of them. (l) Wikimedia Commons (R) Photo by Siyi Chen via Wikimedia Commons
A graphic highlighting all of the ways nanotechnology enhances the effectiveness of sports equipment. Nanowerk via Wikimedia
You would have to increase a carbon nanotube x100,000 to make it the size of a strand of hair.
Want to know more? Jennifer Swanson's Super Gear: Nanotechnology and Sports Team Up was listed as one of the 2016 Best STEM Books by the National Science Teachers Association.
Colorfully illustrated by photos, this book introduces "the science of the very small" as applied to sports equipment and clothing.
MLA 8 Citation
Swanson, Jennifer. "The Science Behind the Olympics." Nonfiction Minute, iNK
Think Tank, 7 Feb. 2018, www.nonfictionminute.org/the-nonfiction-minute/
For Vicki Cobb's BLOG (nonfiction book reviews, info on education, more), click here: Vicki's Blog
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