A boy weighing 40 kg stands on the floor, the area of the soles is 400 cm2, determine the pressure on the floor.

To find out the pressure that the specified boy must exert on the floor, consider the formula: P = Fт / S = mm * g / S.

Const: g – acceleration due to gravity (g ≈ 9.81 m / s2).

Data: mm – weight of the indicated boy (mm = 40 kg); S is the area of the support, soles (S = 400 cm2; in the SI system S = 0.04 m2).

Let’s perform the calculation: P = mm * g / S = 40 * 9.81 / 0.04 = 9.81 * 103 Pa.

Answer: The pressure that the said boy must exert on the floor is 9.81 kPa.