Question

a girl weighing 50N is standing on pencil heels,each having an area of cross section 1cm sqaure. an elephant weighing 200N and food area with a cross section of 250 cm sqaure is standing on the floor.which of the two exerts more pressure on the floor

Answer 1

HELLO THERE!

Practically speaking, the body which takes less area to stand on the floor exerts more pressure than the one which takes more area and stands on the floor.

So, in the above case, the girl exerts more pressure on the floor.

Proof:

$Pressure = \frac{Force}{Area}$

Pressure exerted by girl on floor = 50 / 2 N cm⁻² = 25 N cm⁻² (since total area including two heels = 2 cm⁻²)

Pressure exerted by elephant on floor =

$\frac{200}{4\times250} = 0.2 Ncm^{-2}$

(Since, the area of one foot of the elephant is 250 cm², area of four feet = 4 x 250 = 1000 cm²).

So, it is proved that the girl exerts more pressure on ground.