The spring of a school dynamometer under the action of a force, the modulus of which is 3H

The spring of a school dynamometer under the action of a force, the modulus of which is 3H, is stretched by 1.5 cm. Determine the coefficient of stiffness of the dynamometer spring.

Data: F (modulus of tensile force) = 3 N; Δx (spring tension) = 1.5 cm = 0.015 m.

To determine the coefficient of stiffness of the spring of a school dynamometer, we apply Hooke’s law: F = Fcont = k * Δx, whence we express: k = F / Δx.

Calculation: k = 3 / 0.015 = 200 N / m.

Answer: The spring of the school dynamometer used has a stiffness coefficient of 200 N / m.