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Soccer ball pressure and mass

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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


    Bing Yu, Ph.D.
    Assistant Professor
    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

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