The ratio of force applied to how much the spring streches (or compresses). In the SI, the spring constant would be expressed in Newtons/meter. A larger spring constant means the spring is "stiffer" - more force is required to stretch it a certain amount.
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no the spring constant is not constant on moon because there is no restoring force there
The force constant is unaffected; It is a constant.
F = - k x In this equation, x is the distance that the spring has been stretched or compressed away from its equilibrium position F is the restoring force exerted by the spring. k is the spring constant.
It means how "stiff" the spring is; how hard it is to compress or extend it.
It is Newtons per metre.