Hooke's Law: Calculate Spring Constant k in Newtons or kg?

[misskitty]

Morning peoples,

I have a query about Hooke's Law. I have a problem which asks me to calculate the spring constant (k). I know how to do it, but my question is when I use the formula mg/x can mass be in Newtons or does it have to be in kg?

Looking forward to your answers. Thanks!

 

[FredGarvin]

Mass is never in Newtons. Newtons is a unit of force (remember F=ma?). That being said, if you want to redefine your equation by saying

k = (mg)/x = F/x

Then you can use your force directly.

 

[misskitty]

Thanks for clarifying. Sometimes its hard to remember the simple stuff, you know? Thanks Fred.