Determine the pressure that a young man bravely withstands at a disco when his girlfriend weighing 450 H accidentally steps on his foot with her heel. The area on which the girl rests is 5 cm2. How and why will the pressure exerted on the boy’s leg change if the girl appears at the disco in comfortable sneakers?
F = 450 N.
S = 5 cm2 = 0.0005 m2.
R – ?
R. pressure is called a scalar physical quantity equal to the ratio of the force F to the area S on which this force acts: P = F / S.
P = 450 N / 0.0005 m2 = 900000 Pa = 0.9 MPa.
Since the value of the area S, on which the force acts, is in the denominator, in order to decrease the pressure, it is necessary to increase the area.
In running shoes, the contact area of the sole with the surface is much larger than the contact area of the heel, so the pressure in the trainers will be much less.
Answer: the pressure of the heel on the boy’s leg is P = 0.9 MPa.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.