Category: elementary

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Aerodynamics Experiments to Share With Your Kids

By Aurora Lipper

This article teaches kids about aeronautics and gives a handful of totally fun activities to experiment with for their homeschool science learning (including helicopters, parachutes, and other flying machines).  It’s also good for boy scouts working on a badge, or for any kids that love science experiments.  These experiments are part of a homeschool science program that I teach, and I promise your kids will love it.

Every flying thing, whether it’s an airplane, spacecraft, soccer ball, or flying kid, experiences four aerodynamic primary forces: lift, weight, thrust and drag. An airplane uses a propeller or jet engine to generate thrust. The wings to create lift.

The smooth, pencil-thin shape minimizes drag. And the molecules that make up the airplane attributes to the weight.

Let’s find out what are all the parts of an airplane for. You’ll need to get a cheap balsa wood airplane for this next part – check out your local drug store or toy store. I’ve even found them in grocery stores for about $2.

Take the balsa wood airplane and try to fly just the body (no wings or fins). It flips all over the place. Try flying just the large wing (no body). Somersaults! Now slide the large wing into the body and fly (fewer somersaults, but still sickening to fly in!). Now add a horizontal stabilizer (elevator) tail, and when you throw it, add a slight curve so the plane “fishtails” in the air (like a car)… but did you notice that there are no more somersaults? Add the vertical tail (rudder) and see how it now steers straight no matter how to curve-throw it.

Sneaky Tip: if you remove the metal clip on the nose beforehand, you can add it last to really see what it’s for… notice where most of the weight is without the clip?

Tip for Teaching Homeschool Science:  Keep a small box handy with these items inside: paper clips (in two different sizes), rubber bands, scotch tape, scissors, index cards, string, copy paper, hole punch, crayons, and a stapler.  Label your box “Flying Paper Machine Equipment”.  Pull the box out, add kids, and stand back.

Ready to make more flying things?  Let’s make more things that fly, zoom, twirl, and soar while teaching homeschool science at the same time!

Helicopters. Cut out a paper rectangle 5 by 2 inches. Cut lengthwise down the strip, stopping about an inch before the end. Tape this uncut inch to the end tip of a popsicle stick. Fold the “bunny-ear” flaps down in opposite directions. Throw off a balcony and watch it whirl and gyrate! Optional: You can notch the end of the popsicle stick to make a sling-shot helicopter. Make a quick slingshot launcher by looping a rubber band to another popsicle stick end.

Butterfly Cups. Tape two Dixie paper cups together, bottom-to-bottom. Chain together six rubber bands. Loop one end of the rubber band chain over your thumb and hold your arm out horizontally straight, palm up.  Drape the remainder of the chain along your arm. Place the taped butterfly cups at the free end (near your shoulder) and slowly wind the rubber bands around the middle section of the cups. When you wind near the end, stop, stretch the chain back toward your elbow, make sure the rubber band comes from the underside of the cups and release. The cups should rotate quickly and take air, then gracefully descend down for a light landing. Try making one with four cups.

Hot Air Balloons. Shake out a garbage bag to its maximum capacity. Tape (use duct or masking tape) the open end almost-closed… you still want a small hole the size of the hair dryer nozzle. Use the hair dryer to inflate the bag and heat the air inside (make sure you don’t melt the bag). When the air is at its warmest, release your hold on the bag while you switch off the hair dryer. It should float up to the ceiling and stay there for a while. This experiment works best on cold mornings. The greater the temperature difference between the bag’s air and the surrounding air, the longer it will float.

Parachutes. Attach a piece of floss or thin string to the four corners of a tissue. Attach a stick, a small wad of stones wrapped in another tissue, a pinecone, etc. to the centers of the string. Practice dropping these from the balcony and see which falls slowest with which load.

Ring Thing. Cut an index card into thirds lengthwise. Loop one strip into a circle and tape ends together. Place two remaining strips together end-to-end and tape, then loop into large circle and tape in place. Place a piece of tape across one end of a straw and gently secure one ring to the tape. Repeat on the other end with remaining ring. Make sure the two rings are concentric (you can see through both like a telescope). Throw it small-end-first!

Free Form Machines. Make an obstacle course with some or all the following different challenges: Hit a target balloon (arm the machines with opened paper clips); Go over and under a suspended length of string; Make it through a hula hoop suspended vertically or horizontally; Carry a jelly bean passenger safely across shark-infested waters (two tables spread apart); Dangle large paper airplanes (made from 11×17″ paper, or two 8.5×11″ papers taped together to make an 11×17″) from the ceiling for a ‘dogfight’ to earn points if you tag one; Shoot through the basketball hoop, and dive into a basket.

Article Source: http://www.articlesbase.com/homeschooling-articles/aerodynamics-experiments-to-share-with-your-kids-359924.html

About the Author:  As a teacher, homeschool science teacher, engineer and university instructor Aurora Lipper has been helping kids learn science for over a decade.

Editor’s Note:  Some of the experiments mentioned in this article are actually activities.  To turn an activity into an experiment, be sure to incorporate the scientific method by making a hypothesis about what will happen, conducting the experiment, recording the results, analyzing the results, drawing a conclusion, and, for older children, making a report.

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Activity: Experiencing Centrifugal Force

To perform this activity, you will need a merry-go-round and a small, light-weight ball.

1.  Get onto the merry-go-round and hold on tight.  Have someone spin you very fast. 
    a)  How do you feel yourself being pulled? 
    b)  If you were to let go– which you certainly won’t do– which way do you think you would go? 
    c)  Try moving to the center of the merry-go-round, to a point mid-way between the center and the edge, and then the edge.  At which location do you experience the most “pull”?

2.  Now have the person spin you at a moderate rate while you hold the small ball. 

3.  Look for a landmark object, such as a tree.  The next time you come to the tree, let go of the ball.  Make sure you just let go, don’t throw it.     
    a)  Where does the ball end up? 
    b)  Did it go directly towards the tree?

Have you ever been on one of those amusement park rides that you stand up in while it spins around very fast?  If you have, it feels as if you are being thrown out against the side doesn’t it? 

It’s called centrifugal force, but it is not a force at all.  It is an effect you feel that results from the curved shape of the ride and the forward motion you have.  An object moving in a circle, acts as if it were experiencing an external force when in fact it is not.  Centrifugal force is dependent on the the object’s mass, rotation speed, and the distance from the center of rotation. 

If the walls of the amusement park ride were to suddenly disappear, which way would you go– straight back, or to the side?  Remember which way the ball went when you let go of it while spinning around.

Think of what happens to you when you are in a car that turns suddenly.  You are thrown up against the side of the car.  The reason is explained by understanding an insight from Galileo.  He said things like to keep going the same direction and the same speed.  It takes a force to change the direction or speed of something.  So when the car turns, your body wants to go straight, at least until it is pulled back by the seat belt or hits the side of the car!  Thus, it feels as if you are being thrown up against the side of the car, when in reality you are just going straight as before, while the car is turning.  To better understand this, imagine that the amusement park ride is a square box instead of a circle.   What would happen?  You can try it with a marble and a cardboard box.  Spin the box with the marble in it and watch what happens!

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Inventions, Creative Thinking, and Problem Solving

by Kathleen Julicher
Of the many ways that distinguish people from animals, creativity and the ability to invent is most obvious.  God, when He breathed life into Adam, also gave him intelligence and the desire to create.  While creativity is given in some measure to all people, some like artists, inventors, or authors may have a special gift.  In our homeschools, all of our children will show a spark of creativity.  Nurture that spark in your children by using some of the ideas and resources mentioned in this article.
Creativity is the ability to create something new, or to change something to improve it.  We usually think of creativity as having to do mainly with art, but there is a technical kind of creativity which produces inventions and allows the scientist to solve problems and to design experiments.  Technical creativity and artistic creativity use a similar style of thinking, creativity, but in different ways.  In this way, inventions, artistry, and compositions are all products of creativity.  In science, creativity is expressed by invention, problem solving skills, design of experiments, and thinking of explanations of events.  Since an artist and a scientist use creative thinking in different ways, a good problem solver may not be able to paint, just as an artist may not be able to design experiments.  An excellent mathematical problem solver may not be able to arrange a room or design a bridge.  Technical problem solving and creativity are both part of inventing.
Inventors
There have been many famous inventors in the past whom you can study in your homeschool.  Among them are Edison, Marconi, Da Vinci, Curie, Kettering, Whitney, Carver, Tesla, Land, Babbage, Bell, and the Wright brothers.  What can we study about these inventors?  What similar characteristics did they have?  Curiosity must have been one.  Other similar traits might be: the desire to try something new, the persistence to overcome obstacles; an idea or concept, or maybe a dream; a willingness to take the time to work on a project.  Most inventors have an ability to think “outside the box”.  “The box” refers to common knowledge, or the usual way of doing something.  Discuss the things inventors have in common with your children.  Does your student have any of those characteristics?  Have you told him so?  How would you encourage those characteristics?  Below is a list of activities you can do at home to encourage or to train your young inventors.
Practicing Inventing

  • Let the child use tools (saw, drill, sewing machine, soldering iron, etc.) (safely, of course)
  • Let them have scraps to work on.
  • Compliment them on their projects.
  • Be surprised and pleased when they change something. Even if it is not the way you would have done it.
  • Let them make something without the instructions.
  • Let them make mistakes.
  • Teach them to learn from mistakes without being critical.
  • Let them change the instructions.

There are thousands of other inventors about whom little has written.  For example, we do not know who invented the stirrup, the metal plow, the needle, the iron, weaving, or the written word, so we cannot study the inventors, only the inventions.  In cases such as these, your student can draw the invention, decide how it would affect the way work was done and try to imagine how life must have been without the invention.  For example, stirrups were a terribly important invention and literally transformed Asia and parts of Europe.  In the fifth century, the hordes of Mongolia had stirrups while the peoples they conquered did not.  How must it have been to ride without them for your feet?  How did a soldier swing a saber or throw a javelin accurately and with power while on his horse without stirrups?  By studying the befores and afters of inventions, students can learn about changing and adapting things.
Conflict with traditional thinking
The problem with creative thinking is that it involves a change in the way we do things, or look at things.  A conservative person will have a certain set of recipes to be used on certain days and will resist learning any new recipe and a new or different technique.  This person will ask “When the way we cook dinner is perfectly fine, why change it?”  And so it is with schooling,  If the way we school is working, then why change that?  The natural instinct of most people is to leave well enough alone.  Homeschoolers, by nature are in conflict with traditional schooling, but we can still exhibit conservative, non-creative thinking.  This is exemplified by those who refuse to leave the textbook to do some project or field trip.  Those who wish to teach inventing or creativity, though, must leave the text behind and move at least part of the time into divergent thinking  There are three steps to the teaching of creativity: 
  1. allowing time to think up ideas
  2. allowing the children’s ideas to be different
  3. allowing them to put the ideas into action.   
By doing these things to practice creativity, you encourage it.  You must also model creativity if you expect your children to be inventive.
Practicing creative thinking and invention is easy.  First, set aside some time, perhaps two hours per week, for an activity.  Next, check out some of the activities suggested or some of the books from the resource list for ideas.  If you are doing a craft or an art problem then collect the materials to use.  In this way, your young inventors will have the necessary materials (plus a few unnecessary ones) to do their projects.
The most important thing is that the atmosphere must be conducive to creative thinking.  Do not interrupt brainstorming as this will stop the flow of thinking.  While brainstorming, do not be judgmental or point out the obvious flaws in their ideas.  To do so will inhibit the free flow of thought.  You may expect a product to be made; that is, a physical invention or creation.  It is reasonable to provide a deadline for the work, too, as this will help the children stay focused on the problem at hand.  You should control your own desire to help solve the problem as that is an inhibitor of the children’s creativity.  This may be difficult to do if the problem is especially interesting.  Your own work on the problem must be as collaborator not as an actor.  You should give your student an opportunity to explain the workings of the product.  Smiling is very important for parents, too.
Measuring Creativity
Paul Torrance developed a test which attempts to measure four components of creative ability: fluency, flexibility, originality, and elaboration, all related to the ability to think creatively.  Fluency is the ability to think of many ideas on one topic, whereas flexibility is the ability to use given figures in original ways while elaboration is tested by asking the student to put many details on a picture.  There are other tests which try to measure creativity and each approaches the goal differently.  At home, you can encourage fluency, flexibility, and elaboration by practicing the same skills.  For example, give your child a drawing of a box.  Ask him or her to draw something with lots of details using the box.  He might turn the box into a house, an office, a railroad car, an airplane, a dinosaur, or a hologram of a planet.  The many details of the drawing show elaboration.  Give your student a set of pages with boxes and within each box draw an “x”.  Ask him to draw something different in each box, using the “x” in the drawing.  The idea is to have him draw many different pictures.  Another time you might want him to think of unusual things to draw, uncommon things, out of the lines.  This would be an exercise in originality.  List making is another way to practice creative skills.  Ask your child to make a list of all of the blue things in the room.  He will probably start out with a list of blue colored things, but later, he may start adding things like a sad face, or blues music tapes, the number “3” which seems to be colored blue in his mind’s eye.  The longer the list the better.
In science, we normally think of inventions and problem solving when we think of creativity.  That is another great way to practice creative thinking.  An example of problem solving would be to attempt to answer the question: how could you make a structure made of popsicle sticks stable, so it would not move when pushed? Can you design a car which is drivable by a person without using legs?  Or, what could you use to provide light for reading if your electricity went out?  Invention really is very much like problem solving and you can use problem solving activities to train your children to think inventively.
Creative problem solving ideas:

  • Use these materials: five paper clips, tape, scissors, and a fifteen inch piece of string, and one or two of the following: paper plate, socks, shoelaces, pencils, feathers, hot glue gun and a nail.  
  • Give your students a list of possible projects, like the following:
    • Design a toy for a cat
    • Make a chair for a doll
    • Make a noise maker
    • Design a game
    • Make a tool which will keep a person cool
  • Give your students a time limit and watch what happens!

You never know when creativity and problem solving may be needed.  Years ago, when homeschooling at the beach, we heard yells for help.  A man was being electrocuted and could not release the pipe because his muscles were in spasm.  After explaining to the children that we needed something which did not carry electricity in order to break the circuit in which the man was trapped, everyone fanned out, looking, and quickly returned with items they had found.  One brought a rope, another a board, another a plastic jug, and so on.  The rope did the trick and the electrical connection was broken.  Later, after the ambulance took the man to the hospital, we went over what had happened, reinforcing the ideas of problem solving, creativity, calmness, and electrical safety.
Creative thinking is important to our lives, it comes from God, and should be encouraged in our homeschools.  We can do this by giving them time to create things, by encouraging them, and by being non-judgemental about their ideas.  Plan a weekly time for problem solving and creativity play and your children will grow in their ability to be creative and flexible.
Resources:  
The Art of Problem Solving: Volumes 1 and 2 by Sandor Lehoczky and Richard Rusczky  These two books are a systematic study of problem solving techniques in arithmetic and higher maths.  The authors go beyond mere techniques and teach mathematical reasoning and because of this, the student who works in these books will gain a much deeper feel for mathematics.  They are especially useful in contesting.  Solution sets, too.
Creative Thinking and Problem Solving for Young Learners by Karen S. Meador.  This book is for the youngest of school children, K-4, and the author says that the activities can be used for even younger children.  Starting out with a definition of creativity, the author lays a foundation for the teacher who wants to learn to think creatively, too, and not just use activity sheets according to directions.  The lessons detail different aspects of creative thinking and list ideas designed to teach them.  Literature resources are even used although this is primarily a thinking book.  An excellent resource for homeschool.
Inventions, Inventors and You by Dianne Draze.  A very practical book for busy parents who want to do inventions and inventors in homeschool, but just can’t bring it all together (or don’t have the time).  There are pages to copy and use which provide short lessons in creative thinking and invention.  The book includes fourteen lessons with directions for the teacher, ideas for warming up that creative thinking, reproducible worksheets, many individual projects, and patent activities, plus the answers.  Use this book to build a year of invention.  Grades 3-7. 
The Inventive Mind in Science: Creative Thinking Activities by Christine Ebert and Edward S. Ebert II.  After discussing creativity and creative thought, the authors go straight into activities you can use at home to encourage creative thinking.  The problem of the conceptual block is important for anyone working on developing his creativity, and the authors systematically cover methods to avoid blocks.  The book offers three types of inventing to be used in the classroom: discovery, Rube Goldberg, and practical.  Taking inventions across the disciplines, an invention festival, and patent studies are included in this useful book.  One important part of the book is the Invent! card game used for desktop inventing.
Minds On Science by Hilarie Davis and Anne Dudley.  The appropriate subtitle for this series of books is: Lessons to Link Science and Thinking Skills.  Scientific problem solving and techniques to do it are the subjects of this book.  A plan for solving problems is included, as are lists of possible topics for investigation.  Activities are included in which the students are asked to observe, record, measure, and even make line charts!  The books reviewed are for grades 1-3.  Use this set of books for a great way to integrate thinking and science.  Recommended  A volume each for grades 1-3.
Problems in Search of Creative Solutions by H. Allen Murphey  A wonderful book for your technically creative kids!  This is the book to get for ideas for building projects to be used in contests, team work, or just plain individual fun.  Problems like: “design and construct a device that will shoot projectiles of newspaper into a bushel basket.  This device will hurl, toss, or otherwise propel a projectile from behind a boundary line toward the target.”  The problems are similar to those used for Odessey of the Mind and are great for scout meetings. Other, shorter problems are listed if you only have an afternoon.  Have fun with this one!
Imagination Celebration Creativity Exercises by Judy Leimback and Joan Vydra.  Having trouble getting started teaching creative thinking?  Use this book to get going.  Easy to use reproducible pages with lessons on basic creativity exercises.  Listing things which are soft and white and all the “ships” you can think of (like friendship).  The authors ask questions like “what does gentle look like?” and “what does green sound like?”  Students are asked to rewrite definitions from the dictionary into their own words.  Other specific tasks are set for students which teach four skills: fluency, flexibility, originality, and elaboration.