Do softer tennis balls travel farther when launched? You test three brands of tennis balls with different hardness levels. First, you drop five balls of each brand from one meter and count the bounces. More bounces mean a softer ball.
Next, you launch each ball from the same tennis ball launcher on an open field. You measure how far every ball travels with a measuring tape. Each brand gets five trials to give a reliable average.
Softer balls bounce more and tend to fly farther from the launcher.
Hypothesis
The hypothesis is that softer balls will be bouncier and thus, be able to travel longer distances as compared to harder balls.
How well a ball returns to its original shape after hitting a surface affects how it bounces. You test three brands of tennis balls with different hardness levels. Drop five balls of each brand from one meter and count the bounces. More bounces signal a softer, springier ball. Softer balls bounce more, and they tend to fly farther from a launcher too.
How much bounce a ball keeps after each impact is what the coefficient of restitution measures. To rank tennis balls by this property, drop five balls of each brand from one meter and count the bounces. More bounces mean the ball returns more energy after hitting the surface — a higher coefficient of restitution. Then launch the same balls from a tennis ball launcher on an open field and measure how far each one travels. Softer balls bounce more and tend to fly farther from the launcher, linking retained bounce directly to distance.
Method & Materials
You will drop the balls from a height of one meter and count the number of times it bounces. Then, you will launch the balls from a launcher and measure the distance traveled.
You will need 3 different brands of tennis balls, each with a different degree of hardness, a tennis ball launcher, a measuring tape, a 1 meter long ruler, a large open field, an assistant to help with measurements, and a permanent marker pen.
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The results show that the soft bouncier balls are able to travel further compared to the hard and less bouncy balls. This proves that the hypothesis is true. The manufacturers of sports gear use different methodologies when producing their balls, which gives sports enthusiasts the opportunity to choose the ball that best enhances their performance.
Why do this project?
This science project is interesting because it explores the correlation between the hardness of a tennis ball and the distance it can travel. It also shows how different manufacturers use different methodologies when producing their balls.
Also Consider
Try to repeat the experiment under different temperature conditions. Also, the experiment can be done on a concrete floor instead of in a field.
Full project details
Additional information and source material for this project are available below.
