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  • Soccer ball pressure and mass

    Dear colleagues,

    I need some help to explain some data we obtained in one of our research
    project. One of my students did a study on the impact between soccer
    ball and head. She used soccer balls in 3 sizes: size 3, size 4, and
    size 5. She inflated each ball to 10 PSI, 12 PSI, and 14 PSI, and
    measured ball masses. Here are the results:

    Size 3 ball: 10 PSI: mass = 0.19947 kg, 12 PSI: mass = 0.20339 kg, 14
    PSI: mass = 0.32404 kg

    Size 4 ball: 10 PSI: mass = 0.22305 kg, 12 PSI: mass = 0.22309 kg, 14
    PSI: mass = 0.36728 kg

    Size 5 ball: 10 PSI: mass = 0.25701 kg, 12 PSI: mass = 0.25981 kg, 14
    PSI: mass = 0.42660 kg

    The student and a biomedical engineering faculty repeatedly measured the
    pressures and masses and confirmed these results are correct. Our
    questions is: why did ball masses had significant increases when ball
    presure increased from 12 PSI to 14 PSI? Thank you very much for your
    help.

    Bing

    --
    Bing Yu, Ph.D.
    Assistant Professor
    Director
    Center for Human Movement Science
    Division of Physical Therapy
    The University of North Carolina at Chapel Hill
    Chapel Hill, NC 27599-7135

    Tel: 919-843-8643
    Fax: 919-966-3678
    E-mail: byu@med.unc.edu

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