application of pressure questions
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.Applications of Pressure in Daily Life
The area of the edge of a knife's blade is extremely small.
Syringes are used to take blood for blood tests.
When air is sucked out of a drinking straw, the air pressure inside if decreases and the atmospheric pressure outside forces the liquid to go inside the straw.
➣There are six to fourteen tyres in a truck. These tyres increase the area of contact on which their weight acts, hence, reduce their pressure on the ground.
➣A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently air and dirt particles are sucked into the device.
➣Skiers use long, flat skis to slide over snow the skis have a large area of contact which reduces the pressure on the snow and enables the skier to slide over the snow without sinking in the snow.
➣A school bag has wide straps made of thick cloth (canvas) so that the weight of the bag may fall over a large area of the shoulders of the child producing less pressure on the shoulders.
➣The foundations of high-rise buildings are kept wide to prevent them from sinking in the soil.
➣Camels walk on sandy soil easily because they have broad feet that occupy more area, hence reduce the pressure on the sand.