Soccer fields Science
The hypothesis that a soccer ball will bounce the most number of times on artificial turf is correct.
The type of turf or the condition of the ground does contribute to the bounciness of a soccer ball. The same goes for other types of sports such tennis. When the ball hits the ground, some energy will be lost in the impact between the ground and the ball. The deformation of the shape of the ball will cause friction between the rubber molecules and some energy is lost in the form of heat. The amount of deformation will depend on the hardness of the ground and the type of grass on the turf.
This science fair project can also be repeated to test the bounciness of the soccer ball at different air pressure levels.
Try to repeat the experiment on a hot afternoon and once more on a cold night and compare the results.
What if the soccer field is at a higher altitude? Does that make a difference?
Physics of soccer -http://lc3.littlechute.k12.wi.us/High%20School/Academics/Science%20Department/Janssen/Physics%20Of%20Project/projects/soccerandrewphil/inflation.html
Bouncing balls home page - http://www.howeverythingworks.org/bouncing_balls.htm