when does one exert greater pressure on ground during
walking or standing? why ?
what happends to the period of a simple pendulum taken into
a deep mine
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We human beings walk by lifting one leg, placing it in the
front, then lifting the rear leg, and placing it in the
front; and the cycle continues. Since pressure is nothing
but force per unit area, thus during standing, we place our
weight on both legs in general, and during walking, we place
our weight on one leg most of the time. Thus, the area
through which our weight acts during walking is less than
the same during standing. So, we exert greater pressure
during walking.
Inside a deep mine, the accelaration due to gravity,g,
decreases..the rest is there in formula.
Is This Answer Correct ? | 90 Yes | 21 No |
Answer / rishabh
A walking human will exert more than double his standing pressure.
Weight is equal to mass times gravity (W=mg) but weight is a force, so (W=Fweight=mg). So when you stand your total force is just mass times gravity. But when you walk you are generating a downward acceleration when you step, you are 'pushing ' down with your leg (this is more obvious when you run). So not only is there a force down from standing but an additional force due to the rate of change of the downward momentum of you leg. So momentum is equal to mass times velocity (p=mv), but your momentum is constantly changing with respect to time so (dp/dt=mdv/dt + vdm/dt, where dv/dt is equal to a). Now since we know your changing momentum is causing a force we may say that F=dp/dt. Now lets put all this back together! Ftotal= Fwieght + Fmomentum then
Ftotal= mg + ma! And that is why walking causes more pressure on the earth than standing.
Is This Answer Correct ? | 14 Yes | 21 No |
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