Make a Pi-Day Jump Rope

We originally did this project as a PI Day activity. But you can do this activity anytime of the year, with multiple ages.

What makes this a Pi Day jump rope? Each number from zero to nine are assigned a straw color. Then, 1.5″ straw pieces are threaded onto a rope in order of Pi out 52 digits. (If you do this project, you might go out somewhere around 52 digits, depending on the length of the rope used.

• Cut a 7' 6" piece of rope. It will fray on each end.
  
• Cut a small piece of tape to wrap tightly to each frayed end.
  
• Wrap the tape tightly BELOW the frayed end. Do this to both ends.
  
• Trim off the frayed end. Do this to both ends of the rope.
  
• Next, let's prep the dollar store jump rope handles. Remove the jump rope from the packaging and cut the handles off, leaving about 6 inches of rope on each handle.
• We cut the handles off of the jump rope, leaving about 6" of rope hanging out of the handle. You’ll notice the rope is secure with a little white piece of plastic inside that has the rope wedged in it. There is also a bigger piece of white plastic. It takes some strength to pull that little piece out. An adult should do this part.

  We were able to pull on one handle and the 6”-piece of rope we had left hanging out of the handle. The other handle we had to put some scissors in where the little end piece of rope was handing out and pull the insert apart. It’s a bit of a pain, but once you get it out, these handles work well on the jump rope.
  
• This is what that little piece looks like when it's removed from the handle. You can toss it out.
  
• Put the bigger white insert back into the handle.
  
• Do this step for ONE end of the rope. We'll finish the other handle after we are done stringing the straw pieces. Feed one end of the cord up through the handle.
  
• String one washer onto this end of the cord.
  
• Tie several knots around the washer. We ended up doing 3.
  
• Pull the washer down into the handle.
  
• Now it's time to prep the straws! Assign a number to each color. Use the printable linked below. Write the color next to the numbers. We had to use the neon orange and light orance. So, you may have different hues of the same color that you have to use.
• Place several straws together and put beside the ruler. Using the marker, mark of 1 1/2" pieces.
  
• Separate the colors. You might want to put them on paper plates or in little tubs for faster stringing and to keep them from rolling off the work surface. (We learned that the hard way!)
  
• Starting with 3.14, start stringing the straws onto the rope. (You could use a clear straw or a bead to represent the decimal point.
  
• Optional: At first, we had trouble getting the end of the rope to go through the straw pieces, so we used a skewer to help it through. However, soon the tape was flattened enough from use that we didn't need the skewer.
  
• Continue stringing through the straws, referring to the worksheets to put the numbers in order. We left 8 inches open on the opened end and then put on the handle.
  
• If using duct tape for the handles. You'll want to wrap it neatly around multiple times until it forms a thick handle that is easy for your child to grip. We found using the dollar store handles made for a sturdier jump rope. While it did require extra time and *skill* to get it apart, it worked really well!

A Science Idea for You Pi Jump Rope

Use the jump rope to measure heart rates. Take a resting heart rate, write it down. Then, jump rope for 10 seconds, write down your heart rate. Next, jump rope for 20 seconds and record your heart rate. Repeat for 30 seconds.

When was your heart rate the highest?

What is the difference between your resting heart rate and each heart rate after each interval of jumping rope?

Next, measure the time it takes for your heart rate to return to your recorded resting heart rate? How long did it take for your heart rate to return to your recorded resting heart rate?

Take it further by running around outside for 10 seconds, 20, seconds, 30 seconds. Record your heart rate after each run.

Again, measure how long it takes to return to your resting heart rate.

Which form of exercise raised your heart rate the most?

You might want to try bike riding, roller skating, or doing another form of exercise and compare heart rates for each of the different forms of exercise.