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Science Rocks!

Daredevil Ball Jump II


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Sent in by:
Matt of Merritt Island, FL

Find out how to freeze a bounce or heat one up!

Materials Needed

  • Daredevil Ball Jump (for directions on making one go to the Daredevil Ball Jump activity)
  • measuring stick or tape measure
  • 3 tennis balls
  • 3 rubber balls
  • 3 golf balls
  • 3 balls of clay
  • cardboard box
  • aluminum foil
  • paper and pen for making a chart



  1. Some balls bounce higher than others, but can you change the way a ball bounces? Matt thought that heating them up or cooling them down would make a difference.
  2. To find out, put one of each type of ball you are testing in a freezer.
  3. Put one of each type of ball in a box lined with aluminum foil. Put this box outside in the sun.
  4. Let the balls heat up or cool down for about 3 hours. While you're waiting, you can test the bounce heights of the room temperature balls. To do this, just follow the directions for the Daredevil Ball Jump activity.
  5. You can also make a chart for recording your results while you're waiting. Start by drawing 4 columns. In the left column, write each different type of ball you are testing in a separate row. Across the very top of your chart write "bounce height." At the top of the column next to the types of balls write "room temperature." At the top of the other columns write "warm" and "cold."
  6. Fill in the "room temperature" column with the ball heights you've already measured.
  7. Predict how you think the balls' bounces will be affected by hot and cold.
  8. Now, measure the bounces for both the heated and cooled balls and add your findings to the chart.

Were your predictions right or wrong? Why do you think heat or cold has an effect on the bounce heights? What do you think would happen with baseballs or volleyballs? What about a ball of play-dough? Come up with your own ideas to test, and be sure to send your results to ZOOM.

Some of your Results

Michelle of Houston, TX wrote:
it was a great experiment, thanks

Angelisse, age 13 of New York wrote:
my friendss are trying to do this proyect for science class butt thay have a chaos with this proyecctt it didint workeed well and the ball that jumped higher was the golf ball

Brian, age 10 of Union City, CA wrote:
I didn't get the clay balls to bounce that much at all. it suprise me when the golf ball bounced higher than the rubberball

Sharukaru, age 12 of Jackson, MS wrote:
The ball went very far up into the sky. It was totally laganashed.

ZOOM Fan of Chicago, IL wrote:
Well it really did not work

Elizabeth, age 9 of Milptas, CA wrote:
When I did the Daredevil ball jump II the cold rubber ball jump 69cm.

Guy, age 9 of Maple, ON wrote:
My cold ruber ball worked the same as the room temp. Then I used the same balls but switched them so the room tempreratur ball was cold and it worked.

Jamal, age 11 of Stone Mountain, GA wrote:
I got the same results when I tryed part two of the Daredevil Ball Jump. The golf ball jumped the highest. I did the experiment three times and got the same results. The clay ball wouldn't bounce because it is not round. It also can not bounce because it is deformable. That means you can make it into any shape. you can't do that with the other balls. I think you should try a baseball.

Emma, age 9 of Sudbury, ON wrote:
The tennis ball went higher. Way higher.

Hayden, age 4 of Cambridge, MA wrote:
I discovered that Super Balls bounce higher than tennis balls. Temperature didn't matter much, except for tennis balls. The cold tennis ball barely bounced high at all!

Andrew, age 10 of Ashland, OR wrote:
For me, the heated ball jumped higher. I think the reason for it was because the hardness of the cold ball made it bounce lower.

Amanda and Geneva, age 11 of CA wrote:
When we did it the cold rubber ball bounced the highest. We also tried it without the ramp and just a meter stick, the cold rubber ball still bounced higher. We heated and freezed them by microwave and freezer. We put a tennis ball in the microwave for 5 minutes and it did a small explosion. We did this experiment for our science fair project which we called CrAzY BaLlz. It is a good experiment, thanks!!

Mi, age 11 of Brockton, MA wrote:
When I did the project, I think the heated balls jumped higher because it had less weight. I think the frozen balls jumped lower because of the weight that was added.

Carlos, age 12 of Boston, MA wrote:
I used a baseball and a football. The baseball was between 20-25 cm for room tempurature and the football was 0cm just like the ball of clay no matter what the tempuature.

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