Skipping Science: An Experiment in Jump Rope Lengths
Key Concepts
Coordination, endurance, speed
IntroductionHave you ever wondered how you could do jump rope faster? The U.S. jump-rope record for the greatest number of jumps in one minute is 367! That's more than six jumps a second! How close do you think you can get to that number? What are some of the factors that will help you jump faster? One is the length of the jump rope!
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.
BackgroundJumping rope is great exercise. Professional boxers do it to improve their coordination and endurance. Plus, it can be a lot of fun! That's easy to see when watching students doing jump rope together, often competing for speed or tricks. And, there are official competitions for speed jumping. What would you do to improve your speed? The length of the jump rope can change how many jumps a person can make in a minute, but what length jump rope is ideal? The longer the jump rope the more time it takes to turn it in a full circle. The shorter the jump rope the faster it turns, but because the circle is smaller the jumper might have to jump higher to get over the jump rope, and that might slow the person down or cause him or her to make a mistake.Materials
Preparation
Procedure
Extra: Do this activity again, but this time count both the successful jumps and the number of times the jumper messes up. Did the rope length affect the number of mess-ups?
Extra: Listening to music may affect a person's jumping ability. Try doing jump rope to slow music, fast music and no music. Does the music change how many successful jumps you can make in a minute? How about the number of successful jumps you can make in a row without messing up?
Extra: Can jumping rope help you on a spelling test? Randomly assign volunteers to two groups: One group will not jump rope, but rather copy down 10 words from a spelling list with pen and paper. Members of the other group will jump rope and work with a partner who will call out from the list each word and its spelling first; the jumper will then repeat it, "jumping out" each letter of the word—one jump per letter. How well do the volunteers from each group spell the words the next day (using pen and paper)?
Observations and ResultsWere the most jumps in one minute made using the medium- or short-length jump rope? Were the fewest jumps made using the longest?Using the longest jump rope should have resulted in the fewest number of jumps per minute, whereas using the short- or medium-length ropes should have resulted in the greatest number of jumps per minute, depending on how skilled the jumper is. Not only does the longest rope take the longest amount of time to turn in a full circle, you may also have found the longest one to be a bit unwieldy. The medium-length jump rope is a good length for jumping, and may lead to the fewest number of mistakes. The shortest length turns the fastest, but jumpers have to be skilled to use it well and not make more mistakes with it (often by catching the rope on their heads or feet) than they did using the medium-length rope. More to ExploreIt's Time to Play from KidsHealth
CreditsTeisha Rowland, PhD, Science Buddies
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Key Concepts
Coordination, endurance, speed
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