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Related Concept Videos

Rolling Resistance01:21

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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An Innovative Running Wheel-based Mechanism for Improved Rat Training Performance
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Roller Skating: Flying on Wheels.

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    New urethane-wheel roller skates are causing many injuries, sending skaters to the emergency room. Despite the risks, the fun factor makes them hard to resist for recreational skaters.

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    Area of Science:

    • Orthopedics
    • Sports Medicine
    • Public Health

    Background:

    • The resurgence of roller skating, particularly among recreational and "disco" enthusiasts.
    • Introduction of advanced materials like urethane wheels in modern roller skates.
    • Observed increase in roller skating-related injuries presenting to emergency departments.

    Purpose of the Study:

    • To investigate the incidence and nature of injuries associated with new urethane-wheeled roller skates.
    • To identify the demographic groups most affected by these injuries.
    • To correlate the use of specific roller skate features with injury types.

    Main Methods:

    • Retrospective analysis of emergency room data.
    • Injury surveillance focusing on roller skating incidents.
    • Categorization of injuries based on skate type and activity.

    Main Results:

    • A significant rise in emergency room visits for roller skating injuries.
    • Urethane-wheeled skates are frequently implicated in the reported incidents.
    • Common injuries include fractures, sprains, and contusions, particularly among recreational skaters.

    Conclusions:

    • Urethane-wheeled roller skates, while enhancing performance, are associated with a notable increase in injury rates.
    • Further research into skate design and safety recommendations for recreational users is warranted.
    • Balancing the enjoyment of roller skating with injury prevention strategies is crucial.