What are the units of the spring constant k in Hooke’s Law (F = kx) ?
According to Hook’s Law, the force acting on spring is proportional to its extension. i.e.
F = -kx.
- if we take force unit in Newton(N) and extension x in meter(m) then in S.I. unit spring constant k has a unit of Newton(N)/meter(m). or in short N/m
- in CGS system unit of force is dyne and extension is cm. So, k has unit of dyne/cm
- also in terms of potential energy stored in spring U = 0.5k x^2
if energy U is in joule then k has a unit of jolue/m^2