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Why should one take short footsteps whil...

Why should one take short footsteps while walking on ice ( or oily surface ) ?

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To walk, one exerts a force F obliquely on the ground Fig. The ground also exerts an equal and opposite reaction force R on the man. It is the horizontal component H, of R , which makes walking possible. Frictional force f supplies this horizontal component. As an icy surface is very smooth the frictional force is very small. Hence any attempt to take longer steps can make H greater than the limiting friction. As a result, the person may slip forward.
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Knowledge Check

  • Materials expansion character depends on their being isotropic or anisotropic The superficial and cubical expansion coefficients can be arrived at by the addition of linear coefficient in the three dimensions. While studying the expansion of a solid or a liquid one should consider the expansion of the container also. Any hole in a conductor will become larger on getting heated up as one comments ''expansion is a photographic enalargement". Each liquid has its own characteristics behaviour to change of temperature. Answer the following questions based on above passage: Two sphere of radii is the ratio 1 : 2 of same material, but the first being solid and the second hollow are heated On heating to the same temperature the ratio of the change in their volume will be

    A
    `1:1`
    B
    `1:8`
    C
    `8:3`
    D
    `4:1`

  • Materials expansion character depends on their being isotropic or anisotropic The superficial and cubical expansion coefficients can be arrived at by the addition of linear coefficient in the three dimensions. While studying the expansion of a solid or a liquid one should consider the expansion of the container also. Any hole in a conductor will become larger on getting heated up as one comments ''expansion is a photographic enalargement". Each liquid has its own characteristics behaviour to change of temperature. Answer the following questions based on above passage: Two similar containers A and B are filled with alcohol and water at 4^@C respectively On cooling

    A
    Both of them expand
    B
    Alcohol will condense and water will expand
    C
    Water will condense and alcohol will expand
    D
    Both will expand

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