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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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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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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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Related Experiment Video

Updated: Oct 20, 2025

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
08:26

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running

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Update on Minimalist Running Shoes.

Joseph J Knapik, Robin Orr, Rodney Pope

    Journal of Special Operations Medicine : a Peer Reviewed Journal for SOF Medical Professionals
    |September 16, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Minimalist running shoes (MRS) may improve running performance, but caution is advised. Limit MRS use to 35% of training time to mitigate increased injury risk, especially for heavier runners.

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    Area of Science:

    • Sports Medicine
    • Biomechanics
    • Exercise Physiology

    Background:

    • Previous research suggested minimalist running shoes (MRS) offer benefits like lower energy cost and impact forces compared to conventional running shoes (CRS).
    • Conflicting data existed regarding the risk of injury associated with MRS.

    Purpose of the Study:

    • To compare the effects of MRS versus CRS on running performance and injury incidence over a 26-week period.
    • To determine optimal training load percentages for MRS adoption.

    Main Methods:

    • A 26-week study involving 61 trained runners, randomly assigned to either MRS or CRS.
    • Gradual weekly increase in the proportion of training time in assigned shoes, reaching 35% by week 6.
    • Monitoring of energy cost, 5-km running times, and injury incidence, including location and severity of pain.

    Main Results:

    • Lower energy cost and faster 5-km times were observed in the MRS group after 6 weeks, with no further improvements up to 26 weeks.
    • No significant difference in overall injury incidence between MRS (52%) and CRS (37%) groups (p = .24).
    • Increased running-related pain in the MRS group at the knee, shin, calf, and ankle, correlating with increased mileage and participant body weight.

    Conclusions:

    • Minimalist running shoes can enhance running performance, but optimal use should be limited.
    • Runners should restrict MRS use to approximately 35% of their total training volume.
    • Higher body weight in runners may increase the risk of injury when using MRS.