# Science Fair Projects Involving a Soccer Ball

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Science fair projects can be a drag for some students. Incorporate something that they're interested in, such as sports, to make the project less of a chore and more interesting. A soccer ball can become a part of science project through studying the way that it bounces on different surfaces, air pressure experiments, velocity and trajectory.

## Air Pressure

Study the relationship between air pressure and how far a soccer ball travels. Write a hypothesis with your opinion of what the optimum air pressure for a soccer ball is. The air pressure affects the ball because of the number of air molecules inside. When there are more air molecules inside the ball, the tension on the wall of the ball increases. This will cause the ball to bounce harder and affect the way the ball travels after hitting a surface. Build a slingshot or use a water balloon launcher to test the distance of the ball. Put two pounds of pressure in the ball and launch it with the slingshot. Measure how far the ball travels. Perform the experiment two more times by launching the ball from the same place. Repeat the test again by adding two more pounds of air pressure to the ball. Increase the pressure each time by two pounds until you get to twelve. Write an explanation of your experience including how far you pulled the ball back in the slingshot. Compare the distances of the ball to determine the optimum air pressure for performance. Show your results on a line graph. Write a conclusion evaluating your hypothesis in regards to the conclusion of your experiment.

## Stitching

Experiment with how the stitching of a soccer ball can affect the distance it travels. Write a hypothesis stating which ball you think will travel the farthest. The way the ball is stretched and stitched together along with the material makeup of the ball can affect the shape of the ball and the way it compresses the air inside. Even though all of the balls look round, there could be slight differences in them due to the amount of panels and stitches it took to make it. Bring a friend with you to the soccer field along with four soccer balls. Each soccer ball will have varied amounts of panels on the exterior, usually anywhere between 12 and 32. Have your friend kick each ball ten times using the same force. Measure how far the ball travels and take the average distance for each ball. Explain in your project your experiment and how you executed it. Compare the distances on a line graph and determine whether or not the panels affect the ball’s velocity. State in your conclusion whether the ball you chose in your hypothesis matched up with the results of the experiment.

## Spin

Investigate the relationship between spin and trajectory of the soccer ball. When a ball is kicked straight on with the instep of your foot, it travels straight. If you kick the ball with the toe of your shoe at an angle, the ball can curve in flight from the applied force. The applied force acts as torque and causes the ball to spin. Select which angle you think will curve the ball the most and state it as your hypothesis. Take a video camera to the field with you. Set up the video camera on a tripod to record your experiment. Explore how you strike the ball with your foot in specific spots and how it spins the ball. Examine on the video where you struck the ball with your foot and the resulting path of the ball. Write an account of your experiment. Analyze the kick angles, point of impact and path of the ball by sketching them on a drawing. Use a different color ink for each kick on the drawing to show where each ball travelled. Write a conclusion comparing your hypothesis to the results of the trial.

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