A girl weighing 80 kgf wears a sandal of pointed heel of area of cross section 1cm² standing on a floor. An elephant weighing 2500 kgf stands on foot each of the area of cross section 300 om, on the floor. Compare the pressure exerted by them.
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Weight of girl F=50 kgf=500 N
Heel of area of cross-section =1 cm
2
Area of cross-section of both heels =1×2=2 cm
2
Weighing of elephant =2000 kgf=20000 N
Area of cross-section of each foot =25 cm
2
Area of cross-section all foots =25×4=100 cm
2
Pressure exerted by girl P
girl
=
Area
F
girl
=
2
500
=250 N/cm
2
......... (1)
Pressure exerted by elephant P
elephant
=
Area
F
elephant
=
100
20000
=200 N/cm
2
........(2)
On comparing above two-equation, Girl will apply more pressure on the ground.