Question

Make a 50 cm × 50 cm bed of dry sand about 10 cm in thickness. Make sure

that its top surface is levelled. Take a wooden or a plastic stool. Cut two strips of

graph paper each with a width of 1 cm. Paste them vertically on any leg of the stool—

one at the bottom and the other from the top. Now gently put the stool on the sand

bed with its legs resting on the sand. Increase the size of sand bed if required. Now

put a load, say a school bag full of books, on the seat of the stool. Mark the level of

sand on the graph strip. This would give you the depth, if any, to which the legs of

stool sink in sand. Next, turn the stool upside down so that now it rests on its seat on

the sand bed. Note the depth to which the stool sinks now. Next, put the same load

on the stool and note the depth to which it sinks in the sand. Compare the pressure

exerted by the stool in the two situations.​

Answer 1

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