17) Explain with a suitable example that pressure varies inversely as the area of the surface on which the force is applied, if the force remains constant. ns.
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Example: Wheels of tractors are made wider than other vehicles because generally tractors are used in sandy and muddy fields. To increase pressure produced by it's Tyres, large sized Tyres are used on it so that it can easily run over field with less pressure.
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I ) Pressure is increased by reducing the surface area
eg: the ends of nails are made pointed so that large pressure is exerted through the pointed end and they can be driven into, with less effort
ii) pressure is decreased by increasing the surface area
eg: wide wooden sleepers are placed below the railway tracks so that the pressure exerted by the iron nails on the ground becomes less
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