please explain this. i am of class VIII and the chapter name is force and pressure .....
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Answers
Explanation:
Pressure is defined as the force per unit area.
Weight is the force acted by the object of mass 'm kg' towards the center of the Earth due to Earth's gravity and is equal to the value of 'm x g' Newtons, where 'g' is the acceleration due to gravity (g= 9.806 m/s^2).
The pressure and area are inversely related which means, more pressure on less area or less pressure on bigger area keeping the force constant.
In case of red block, the force (weight) acts on bigger area (800 cm^2) and hence the pressure exerted by this area is less (0.0125 kgf cm^-2).
In case of green block, same force acts on the lesser area (200 cm^2) and hence the pressure exerted by this area is more than the previous case (0.05 kgf cm^-2).
Weight here is given in 'kgf' which is another unit other than 'Newton.
Hope it helps.